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学者姓名:王树众

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Supercritical CO2-water-shale interactions and their effects on element mobilization and shale pore structure during stimulation EI SCIE
期刊论文 | 2019 , 202 , 109-127 | International Journal of Coal Geology
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Abstract :

There are many advantages to using supercritical carbon dioxide (ScCO2) fracturing technology to exploit shale gas reservoirs in China, including minimal damage to the environment or formation, and displacing methane (CH4) in the adsorbed state. When ScCO2 enters fractures in the formation, ScCO2-water-shale interactions may affect the physicochemical properties of shale. In this study, a high-pressure reaction system was adopted to simulate ScCO2-water-shale interactions under ScCO2 stimulation conditions. The element mobilization and pore structure before and after the reaction were measured using ICP-MS, XRF. The results show that the major elements, including Ca, Mg, Na, K, and Al, exhibit varying degrees of mobilization after the interactions because of dissolution of carbonate and silicate minerals in shale samples. Compared with the major elements, trace elements have a lower mobility, quantified as <13.97%. The specific surface areas and pore volumes of two shale samples increase at different degrees after the reaction. The interactions have a more significant influence on the micropores. In addition, fractal features of the shale pore structure were analyzed. The fractal dimensions of the shale samples increase after the reaction, indicating that pore surface roughness increases, and pore structure morphology gradually transforms from regular to complex. © 2018 Elsevier B.V.

Keyword :

Element mobilization Fractal feature Major elements Minimal damage Physicochemical property Shale gas reservoirs Supercritical carbon dioxides Supercritical CO2

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GB/T 7714 Luo, Xiangrong , Ren, Xiaojuan , Wang, Shuzhong . Supercritical CO2-water-shale interactions and their effects on element mobilization and shale pore structure during stimulation [J]. | International Journal of Coal Geology , 2019 , 202 : 109-127 .
MLA Luo, Xiangrong 等. "Supercritical CO2-water-shale interactions and their effects on element mobilization and shale pore structure during stimulation" . | International Journal of Coal Geology 202 (2019) : 109-127 .
APA Luo, Xiangrong , Ren, Xiaojuan , Wang, Shuzhong . Supercritical CO2-water-shale interactions and their effects on element mobilization and shale pore structure during stimulation . | International Journal of Coal Geology , 2019 , 202 , 109-127 .
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Influences of oxygen on corrosion characteristics of TiO2/316L stainless steel in supercritical water EI CPCI-S SCIE
期刊论文 | 2019 , 44 (11) , 5099-5107 | International Journal of Hydrogen Energy
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Abstract :

Supercritical water gasification (SCWG) is a promising technology for converting organic wastes to hydrogen. Less amount of oxygen is beneficial for increasing hydrogen generation rate. However, the corrosion rate of reactor material would be accelerated. TiO2 coating with a thickness of 0.1 mm was prepared on the surface of 316L stainless steel (SS316L) to improve its corrosion resistance in supercritical water (SCW). The corrosion performances of TiO2/SS316L were tested in a bath SCW reactor at 400 °C, 25 MPa. The influences of oxygen concentration (0–1000 mg/L) on surface morphologies and corrosion depths were studied thoroughly. Results indicated that the surface of TiO2/SS316L exhibited cracks and pores after exposed in SCW. And the average corrosion rates accelerated at higher oxygen concentrations. The interface between the coating and medium was relatively smooth and there was no obvious change in the thickness of the coating with oxygen concentration of 0 and 500 mg/L. While for that with 1000 mg/L oxygen, the surface of TiO2/SS316L exhibited reticulate crack. The cross section showed a serrate structure, and only 0.08 mm thick of the coating was remained. In addition, the corrosion mechanism of coating was discussed. © 2018 Hydrogen Energy Publications LLC

Keyword :

316 L stainless steel Average corrosion rates Corrosion characteristics Corrosion performance Oxygen concentrations Supercritical water Supercritical water gasification (SCWG) TiO2

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GB/T 7714 Wang, Yuzhen , Liu, Zhuan , Zhang, Xiaoqiang et al. Influences of oxygen on corrosion characteristics of TiO2/316L stainless steel in supercritical water [J]. | International Journal of Hydrogen Energy , 2019 , 44 (11) : 5099-5107 .
MLA Wang, Yuzhen et al. "Influences of oxygen on corrosion characteristics of TiO2/316L stainless steel in supercritical water" . | International Journal of Hydrogen Energy 44 . 11 (2019) : 5099-5107 .
APA Wang, Yuzhen , Liu, Zhuan , Zhang, Xiaoqiang , Gao, Fen , Yang, Jianqiao , Fang, Changqing et al. Influences of oxygen on corrosion characteristics of TiO2/316L stainless steel in supercritical water . | International Journal of Hydrogen Energy , 2019 , 44 (11) , 5099-5107 .
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Effects of temperature and pressure on rheology and heat transfer among bubbles in waterless CO2-based foam fracturing fluid SCIE
期刊论文 | 2019 , 63 , 18-26 | JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
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Abstract :

Waterless CO2-based foam, stabilized by C4F9OCH3, is used as a fracturing fluid to enhance oil and gas production. To enhance basic understanding of this multiphase CO2-based foam fluid, we mainly focus on the effects of temperature and pressure on its slip flow and heat transfer characteristics. The evolution of effective viscosity and rheological parameters of the CO2-based foam is demonstrated. In particular, the effective viscosity decreases significantly as the CO2 turns into a supercritical state. Moreover, the fanning friction factor, as well as the drag reduction rate due to the wall slip of foam, increases with the rise of pressure, and the influence of pressure on the resistance characteristics is relatively greater than that of the temperature. Additionally, the convective heat transfer coefficient increases with the pressure and slightly decreases with the temperature. By analyzing the complex interaction and heat transfer among the flowing bubbles, the behavior of heat transfer enhancement is found. Moreover, a "non-Newtonian thermal conductivity" is introduced in this study, and Nusselt number of the foam fluid with a yield stress is deduced. More importantly, it is found that the behavior of heat transfer enhancement is particularly sensitive to the shear rate, owing to strong interaction among the bubbles in the flowing CO2-based foam.

Keyword :

Heat transfer Foam Rheology Fracturing fluid

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GB/T 7714 Jing, Zefeng , Feng, Chenchen , Wang, Shuzhong et al. Effects of temperature and pressure on rheology and heat transfer among bubbles in waterless CO2-based foam fracturing fluid [J]. | JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING , 2019 , 63 : 18-26 .
MLA Jing, Zefeng et al. "Effects of temperature and pressure on rheology and heat transfer among bubbles in waterless CO2-based foam fracturing fluid" . | JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING 63 (2019) : 18-26 .
APA Jing, Zefeng , Feng, Chenchen , Wang, Shuzhong , Xu, Donghai . Effects of temperature and pressure on rheology and heat transfer among bubbles in waterless CO2-based foam fracturing fluid . | JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING , 2019 , 63 , 18-26 .
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Effect Mechanism of Auxiliary Fuel in Supercritical Water: A Review SCIE
期刊论文 | 2019 , 58 (4) , 1480-1494 | INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
WoS CC Cited Count: 1
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Abstract :

Supercritical water oxidation is a promising alternative for treatment of wastewater and sludge. The addition of auxiliary fuel can achieve the optimization of the system. Owing to the discrepancy in the fuel parameter and reaction condition, the auxiliary fuel presents two different behavior mechanisms in supercritical water, co-oxidation and hydrothermal combustion. The process mechanism, kinetics analysis, and effect behavior for these two processes were systematically reviewed in this work. The co-oxidation between auxiliary fuel compounds, such as methanol, ethanol, isopropyl alcohol, etc. and ammonia, polychlorinated biphenyls was analyzed, and the mixing kinetics models and mechanism investigation approaches were summerized. Besides, the process analysis, kinetics model, and interaction during the supercritical hydrothermal combustion with higher concentration of auxiliary fuel were discussed. Finally, a supercritical water oxidation system with optimized auxiliary fuel was proposed and evaluated by the mechanism-based kinetics simulation, and further research needs were put forward.

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GB/T 7714 Zhang, Jie , Wang, Shuzhong , Ren, Mengmeng et al. Effect Mechanism of Auxiliary Fuel in Supercritical Water: A Review [J]. | INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH , 2019 , 58 (4) : 1480-1494 .
MLA Zhang, Jie et al. "Effect Mechanism of Auxiliary Fuel in Supercritical Water: A Review" . | INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH 58 . 4 (2019) : 1480-1494 .
APA Zhang, Jie , Wang, Shuzhong , Ren, Mengmeng , Lu, Jinling , Chen, Senlin , Zhang, Huamin . Effect Mechanism of Auxiliary Fuel in Supercritical Water: A Review . | INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH , 2019 , 58 (4) , 1480-1494 .
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Co-oxidation effects and mechanisms between sludge and alcohols (methanol, ethanol and isopropanol) in supercritical water SCIE
期刊论文 | 2019 , 366 , 223-234 | CHEMICAL ENGINEERING JOURNAL
WoS CC Cited Count: 1
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Abstract :

Sludge is a by-product of wastewater treatment process with high organic and nitrogen contents. Supercritical water oxidation (SCWO) rates of refractory species in sludge might be accelerated by reactive alcohols, which is referred to as a co-oxidation phenomenon. In this work, influences of three typical reactive alcohols (methanol, ethanol and isopropanol) on TOC and of NH3-N removal rates of sludge by SCWO were analyzed and their cooxidation products were characterized by GC-MS, FT-IR, EDS and TG-DTG methods. Additionally, to capture the nature of co-oxidation, HO2 center dot and OH center dot radicals released by alcohols were theoretically compared with detailed chemical kinetics models using the Chemkin Software. The results show that methanol, ethanol and isopropanol all exhibited co-oxidation accelerated effects on TOC and NH3-N removal rates of sludge. One reason was that alcohols provided reactive HO2 center dot and OH center dot radicals. The other reason was that adding alcohols not only prevented forming recalcitrant products (non-nitrogen and nitrogen aromatic compounds) but also encouraged producing reactive products (non-nitrogen open chain compounds). Ethanol offered the best co-oxidation promotion effects on the removal of TOC and NH3-N in the liquid products and also gave the lowest organic contents in the solid products, followed by isopropanol and methanol. This order was consistent with the difficulty of how the alcohols themselves could be oxidized in supercritical water since ethanol could support the highest amount of HO2 center dot radicals for sludge in the shortest time.

Keyword :

Sludge Supercritical water Co-oxidation Detailed chemical kinetics model Alcohol

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GB/T 7714 Qian, Lili , Wang, Shuzhong , Ren, Mengmeng et al. Co-oxidation effects and mechanisms between sludge and alcohols (methanol, ethanol and isopropanol) in supercritical water [J]. | CHEMICAL ENGINEERING JOURNAL , 2019 , 366 : 223-234 .
MLA Qian, Lili et al. "Co-oxidation effects and mechanisms between sludge and alcohols (methanol, ethanol and isopropanol) in supercritical water" . | CHEMICAL ENGINEERING JOURNAL 366 (2019) : 223-234 .
APA Qian, Lili , Wang, Shuzhong , Ren, Mengmeng , Wang, Shuang . Co-oxidation effects and mechanisms between sludge and alcohols (methanol, ethanol and isopropanol) in supercritical water . | CHEMICAL ENGINEERING JOURNAL , 2019 , 366 , 223-234 .
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Catalytic performances of Ni-based catalysts on supercritical water gasification of phenol solution and coal-gasification wastewater SCIE
期刊论文 | 2019 , 44 (7) , 3470-3480 | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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Abstract :

Activity and stability of the supported Ni-based catalysts for the gasification performances of phenol solution and coal-gasification wastewater in supercritical water were studied in a continuous reactor at 480 degrees C, 25 MPa and oxygen ratio of 0.2 for 50 h operation. The in- fluences of the supports (gamma-Al2O3, active carbon (AC) and carbon nanotube (CNT)) on gas yields, gasification efficiencies for phenol solution were investigated, and the loading amount of Ni were optimized. Results showed that the catalytic activity and the stability of the catalysts followed the order of Ni/CNT > Ni/AC > Ni/gamma-Al2O3. The activity of Ni/AC and Ni/gamma-Al(2)O(3 )decreased after 30 h continuous operation, and there occurred significant leaching of Ni2+. For Ni/CNT catalyst, H-2 yield increased obviously when the loading amount of Ni lower than 15 wt%, while increased little at higher loading amount. Then, 15 wt% Ni/CNT with a thickness of 1.5 mm was coated on 316 L stainless steel (SS316L, an economic material usually used as the reactor material), which can act as a "catalytic tube wall" in reactor. The catalytic activity and corrosion resistance of Ni/CNT/SS316L for the gasification of real coal-gasification wastewater were studied. Results showed that Ni/CNT/SS316L gave a great positive effect on H-2 production. H-2 yield increased from 25.36 mmol/g (total organic carbon) without catalyst to 75.12 mmol/g (total organic carbon) with Ni/CNT/ SS316L after operated for 20 h, respectively. However, obvious pealing of the coating was found after 50 h operation. Further study is necessary for the improvement of the coating preparation method. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Keyword :

Ni Phenol Supercritical water gasification Catalyst Coal-gasification wastewater

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GB/T 7714 Wang, Yuzhen , Zhu, Yitong , Liu, Zhuan et al. Catalytic performances of Ni-based catalysts on supercritical water gasification of phenol solution and coal-gasification wastewater [J]. | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2019 , 44 (7) : 3470-3480 .
MLA Wang, Yuzhen et al. "Catalytic performances of Ni-based catalysts on supercritical water gasification of phenol solution and coal-gasification wastewater" . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 44 . 7 (2019) : 3470-3480 .
APA Wang, Yuzhen , Zhu, Yitong , Liu, Zhuan , Wang, Laibin , Xu, Donghai , Fang, Changqing et al. Catalytic performances of Ni-based catalysts on supercritical water gasification of phenol solution and coal-gasification wastewater . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2019 , 44 (7) , 3470-3480 .
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Supercritical water oxidation of quinoline with moderate preheat temperature and initial concentration EI Scopus SCIE
期刊论文 | 2019 , 236 , 1408-1414 | Fuel
WoS CC Cited Count: 1 SCOPUS Cited Count: 2
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Abstract :

This work reports an experimental study on supercritical water oxidation of quinoline. Moderate preheat temperature (420 °C–510 °C) and initial concentration (1 wt%–10 wt%) are selected to address the possibility of utilizing the heat released during the reaction, in order to realize high conversion rate at relatively low preheat temperature. The effects of temperature, residence time, oxidation ratio, pressure and concentration are analyzed. The results show that considerable conversion can happen at relatively low preheat temperature, while increase in temperature will significantly promote the complete conversion. The yield of carbon dioxide increases with the residence time but there is an upper limit due to the stronger dependence on oxidizer concentration, for which an estimated reaction order is 1.90. When the quinoline concentration is larger than 8 wt%, clear exothermic peaks with temperature rise about 100 °C are detected. These exothermic peaks can be interpreted as a sign of ignition interrupted by the heat loss to the surrounding salt bath. An analogy is made between the start temperatures of these exothermic peaks and the ignition temperatures reported in methanol and isopropanol hydrothermal flame research. We conclude that quinoline solutions can be ignited without co-fuels, at comparable ignition temperature as methanol and isopropanol around 450 °C. © 2018 Elsevier Ltd

Keyword :

Heat release Initial concentration Preheat temperature Quinoline Supercritical water oxidation

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GB/T 7714 Ren, Mengmeng , Wang, Shuzhong , Yang, Chuang et al. Supercritical water oxidation of quinoline with moderate preheat temperature and initial concentration [J]. | Fuel , 2019 , 236 : 1408-1414 .
MLA Ren, Mengmeng et al. "Supercritical water oxidation of quinoline with moderate preheat temperature and initial concentration" . | Fuel 236 (2019) : 1408-1414 .
APA Ren, Mengmeng , Wang, Shuzhong , Yang, Chuang , Xu, Haitao , Guo, Yang , Roekaerts, Dirk . Supercritical water oxidation of quinoline with moderate preheat temperature and initial concentration . | Fuel , 2019 , 236 , 1408-1414 .
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Modelling and Analysis of the Corrosion Characteristics of Ferritic-Martensitic Steels in Supercritical Water. PubMed SCIE
期刊论文 | 2019 , 12 (3) | Materials
WoS CC Cited Count: 1
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Abstract :

The dependencies of weight gain of 9-12 Cr ferritic-martensitic steels in supercritical water on each of seven principal independent variables (temperature, oxygen concentration, flow rate, exposure time, and key chemical composition and surface condition of steels) have been predicted using a supervised artificial neural network (ANN). The relative significance of each independent variable was uncovered by fuzzy curve analysis, which ranks temperature and exposure time as the most important. The optimized ANN, not only satisfactorily represents the experimentally-known non-linear relationships between the corrosion characteristics of F-M steels and the key independent variables (demonstrating the effectiveness of this technique), but also predicts and reveals that the effects of oxygen concentration on the weight gains, to a certain degree, is influenced by the flow rate and temperature. Finally, according to the ANN predicted-results, departure of oxidation kinetics from the parabolic law, and basic cause of chromium content in steel substrate influencing the corrosion rate, and the synergetic effects of dissolved oxygen concentration, flow rate, and temperature, are discussed and analyzed.

Keyword :

F-M steels oxidation supercritical water fuzzy curve analysis weight gain artificial neural network

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GB/T 7714 Li Yanhui , Xu Tongtong , Wang Shuzhong et al. Modelling and Analysis of the Corrosion Characteristics of Ferritic-Martensitic Steels in Supercritical Water. [J]. | Materials , 2019 , 12 (3) .
MLA Li Yanhui et al. "Modelling and Analysis of the Corrosion Characteristics of Ferritic-Martensitic Steels in Supercritical Water." . | Materials 12 . 3 (2019) .
APA Li Yanhui , Xu Tongtong , Wang Shuzhong , Fekete Balazs , Yang Jie , Yang Jianqiao et al. Modelling and Analysis of the Corrosion Characteristics of Ferritic-Martensitic Steels in Supercritical Water. . | Materials , 2019 , 12 (3) .
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Extremely slow settling behavior of particles in dilute wormlike micellar fluid with broad spectrum of relaxation times EI SCIE Scopus
期刊论文 | 2019 , 1-5 | JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
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We selected a 1.4 wt% Octadecyl trimethyl ammonium chloride (OTAC) concentration wormlike micellar fluid with broad relaxation time spectrum and another single relaxation Maxwell fluid of 4.0 wt% OTAC concentration with a constant weight ratio of OTAC to NaSal of 5: 1. The shear viscosity, dynamic modulus as well as the extensional viscosity were tested. The steady and unsteady motion of spheres were investigated by high-speed video images in these two wormlike micellar fluids. Extremely slow settling velocity is found when smaller spheres with diameters of 3.2 and 4.0mm settles in the 1.4 wt% OTAC solution. Stronger rebound of these spheres occurs in this fluid. Comparing with particle settling velocity in inelastic power law fluid, we concluded that this extremely slow sedimentation in the 1.4 wt% OTAC solution seems to be dominated by the slowest stress relaxation of this solution. The rheology test demonstrated that this wormlike micellar fluid has more tensile hardening, low viscosity and strong elasticity. The oscillation of sphere results from the elasticity of the entangled microstructures of wormlike micelles. For a Maxwell viscoelastic 4.0 wt% OTAC solution, settling behaviors of spheres agree with previous literatures that the flow becomes instability as the Wi number exceeds a critical value. Graphic Abstract [GRAPHICS] Steady and unsteady motion of Particles settling in two kinds of wormlike micellar fluids, one with broad relaxation time spectrum and another with single relaxation Maxwell fluid, were investigated by high speed video camera. The shear viscosities, dynamic modulus as well as the extensional viscosities were tested. Extremely slow settling velocity is found when smaller spheres settles in the broad relaxation time spectrum solution. Stronger rebound of these spheres occurs in this fluid. Comparing with inelastic power law fluid settling velocity, we concluded that this extremely slow sedimentation in broad relaxation time spectrum solution seems to be dominated by the slowest stress relaxation of this solution. The oscillation of sphere results from the elasticity of the entangled microstructures of wormlike micelles with tensile hardening in extensional rheology.

Keyword :

Settling velocity wormlike micellar fluid stress relaxation spectrum steady and unsteady motion

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GB/T 7714 Wang, ZG , Wang, SZ , Xu, L et al. Extremely slow settling behavior of particles in dilute wormlike micellar fluid with broad spectrum of relaxation times [J]. | JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY , 2019 : 1-5 .
MLA Wang, ZG et al. "Extremely slow settling behavior of particles in dilute wormlike micellar fluid with broad spectrum of relaxation times" . | JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY (2019) : 1-5 .
APA Wang, ZG , Wang, SZ , Xu, L , Dou, YH , Su, XH . Extremely slow settling behavior of particles in dilute wormlike micellar fluid with broad spectrum of relaxation times . | JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY , 2019 , 1-5 .
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Heterogeneous catalytic effects on the characteristics of water-soluble and water-insoluble biocrudes in chlorella hydrothermal liquefaction EI SCIE CPCI-S Scopus
期刊论文 | 2019 , 243 , 165-174 | APPLIED ENERGY
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The hydrothermal liquefaction (HTL) of microalgae produces water-soluble biocrude (WSB) and water-insoluble biocrude (WISB) simultaneously. The effects of heterogeneous catalysts (Le. Pt/C, Ru/C, and PVC + RU/C) on the properties of the two types of biocrudes derived from Chlorella HTL were explored for the first time. The results show that the addition of catalyst (Pt/C, Ru/C, or Pt/C + Ru/C) and/or the increase of residence time (from 10 to 30 min) could decrease the WSB fraction in total biocrude (WSB + WISB) mainly due to the improvement of the WISB yield. The catalytic effects on the WISB yield primarily occurred at the low algae loading (i.e., 1:10 of algae/water) condition, and there was a certain synergetic catalytic effect between Pt/C and Ru/C at this condition. The catalytic effect of Pt/C on the yields of WISB and total biocrude reduced as residence time increased. At the HTL conditions of 350 degrees C, 0.3 MPa H-2, and 1:5 of algae/water for 30 min, PVC and Ru/C separately led to WSB and WISB with the highest C (63.57 and 74.16 wt%), H (7.34 and 8.44 wt%) contents and the lowest N (12.19 and 7.06 wt%), O (14.06 and 9.15 wt%) contents, and the highest HHVs (29.73 and 35.60 MJ/kg). The WISB produced with Pt/C mainly consisted of amides, hydrocarbons, organic acids and phenols. Pt/C could promote the cracking of high-molecular-weight compounds in WSB to form more low-boiling-point compounds.

Keyword :

Hydrothermal liquefaction Microalgae Heterogeneous catalyst Water-soluble biocrude Water-insoluble biocrude

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GB/T 7714 Xu, DH , Guo, SW , Liu, L et al. Heterogeneous catalytic effects on the characteristics of water-soluble and water-insoluble biocrudes in chlorella hydrothermal liquefaction [J]. | APPLIED ENERGY , 2019 , 243 : 165-174 .
MLA Xu, DH et al. "Heterogeneous catalytic effects on the characteristics of water-soluble and water-insoluble biocrudes in chlorella hydrothermal liquefaction" . | APPLIED ENERGY 243 (2019) : 165-174 .
APA Xu, DH , Guo, SW , Liu, L , Lin, GK , Wu, ZQ , Guo, Y et al. Heterogeneous catalytic effects on the characteristics of water-soluble and water-insoluble biocrudes in chlorella hydrothermal liquefaction . | APPLIED ENERGY , 2019 , 243 , 165-174 .
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