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Co-pyrolysis behavior of microalgae biomass and low-rank coal: Kinetic analysis of the main volatile products. PubMed Scopus SCIE
期刊论文 | 2019 , 271 , 202-209 | Bioresource technology
SCOPUS Cited Count: 3
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Abstract :

This work studied the kinetic characteristics of volatile products from co-pyrolysis of microalgae and low-rank coal. Iso-conversional method was applied to calculate the reaction order, activation energy and pre-exponential factor of gaseous products (H2, CO, CH4, and CO2) and benzene. The results indicated the activation energy of H2 generating from both individual and mixing samples was the highest, meaning H2 was the hardest to generate during the pyrolysis process. The values of activation energy from the formation of CO and benzene from low-rank coal and green algae were 31.11, 32.44, 18.21 and 24.31 kJ·mol<sup>-1</sup>, respectively. The formation of benzene and CO were easier than other volatile products due to the lower activation energy. Synergistic effects were observed from the formation of CO2, the addition of green algae decreased the activation energy. The order of the activation energy was in agreement with that of the releasing sequence of main volatile products.

Keyword :

Kinetic analysis Low-rank coal Microalgae biomass Co-pyrolysis Synergistic effects

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GB/T 7714 Wu Zhiqiang , Li Yaowu , Zhang Bo et al. Co-pyrolysis behavior of microalgae biomass and low-rank coal: Kinetic analysis of the main volatile products. [J]. | Bioresource technology , 2019 , 271 : 202-209 .
MLA Wu Zhiqiang et al. "Co-pyrolysis behavior of microalgae biomass and low-rank coal: Kinetic analysis of the main volatile products." . | Bioresource technology 271 (2019) : 202-209 .
APA Wu Zhiqiang , Li Yaowu , Zhang Bo , Yang Wangcai , Yang Bolun . Co-pyrolysis behavior of microalgae biomass and low-rank coal: Kinetic analysis of the main volatile products. . | Bioresource technology , 2019 , 271 , 202-209 .
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Spatial positioning effect of dual cocatalysts accelerating charge transfer in three dimensionally ordered macroporous g-C3N4 for photocatalytic hydrogen evolution Scopus SCIE
期刊论文 | 2019 , 243 , 94-105 | Applied Catalysis B: Environmental
SCOPUS Cited Count: 1
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Abstract :

© 2018 Elsevier B.V. The relatively low charge transfer efficiency remains the critical limiting factor for the practical application of solar-driven water splitting. In this work, a promising photocatalyst intensified by dual cocatalysts was developed via separately loading Au nanoparticles and CoP nanosheets onto the inside and outside surface of three dimensionally ordered macroporous (3DOM) g-C3N4 framework to significantly facilitate the ordered transfer of charges. The spatial positioning of dual cocatalysts and average wall thickness of 3DOM g-C3N4 framework were precisely controlled to reveal the optimal distribution position of Au and CoP as well as the most appropriate transfer distance for charges (from 3DOM g-C3N4 walls to the surface of cocatalysts), respectively. The results show that the spatial positioning effect of dual cocatalysts and optimization of charge transfer distance can endow the CoP/3DOM g-C3N4/Au photocatalyst with an excellent charge transfer efficiency, thereby contributing to high apparent quantum efficiency (AQE, 27.6% at 435 nm and 29.9% at 550 nm) and photocatalytic H2 evolution activity of 11,820.1 μmol h−1 g−1, which is up to 619.9, 6.5 and 5.6 times than that of 3DOM g-C3N4, CoP/3DOM g-C3N4 and 3DOM g-C3N4/Au, respectively. This work would provide a new platform to design high-performance artificial photocatalysts with superior charge transfer capacity.

Keyword :

3DOM g-C3N4 Charge transfer distance Dual cocatalysts Photocatalytic hydrogen evolution Spatial positioning effect

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GB/T 7714 Lin, Bo , Li, Jiali , Xu, Baorong et al. Spatial positioning effect of dual cocatalysts accelerating charge transfer in three dimensionally ordered macroporous g-C3N4 for photocatalytic hydrogen evolution [J]. | Applied Catalysis B: Environmental , 2019 , 243 : 94-105 .
MLA Lin, Bo et al. "Spatial positioning effect of dual cocatalysts accelerating charge transfer in three dimensionally ordered macroporous g-C3N4 for photocatalytic hydrogen evolution" . | Applied Catalysis B: Environmental 243 (2019) : 94-105 .
APA Lin, Bo , Li, Jiali , Xu, Baorong , Yan, Xiaoqing , Yang, Bolun , Wei, Jinjia et al. Spatial positioning effect of dual cocatalysts accelerating charge transfer in three dimensionally ordered macroporous g-C3N4 for photocatalytic hydrogen evolution . | Applied Catalysis B: Environmental , 2019 , 243 , 94-105 .
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Enhanced Cycling Performance for Lithium?Sulfur Batteries by a Laminated 2D g-C3N4/Graphene Cathode Interlayer EI SCIE PubMed
期刊论文 | 2019 , 12 (1) , 213-223 | ChemSusChem
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Abstract :

Decay in electrochemical performance resulting from the “shuttle effect” of dissolved lithium polysulfides is one of the biggest obstacles for the realization of practical applications of lithium–sulfur (Li–S) batteries. To meet this challenge, a 2D g-C3N4/graphene sheet composite (g-C3N4/GS) was fabricated as an interlayer for a sulfur/carbon (S/KB) cathode. It forms a laminated structure of channels to trap polysulfides by physical and chemical interactions. The thin g-C3N4/GS interlayer significantly suppresses diffusion of the dissolved polysulfide species (Li2Sx; 2<x≤8) from the cathode to the anode, as proven by using an H-type glass cell divided by a g-C3N4/GS-coated separator. The S/KB cathode with the g-C3N4/GS interlayer (S/KB@C3N4/GS) delivers a discharge capacity of 1191.7 mAh g−1 at 0.1 C after 100 cycles, an increase of more than 90 % compared with an S/KB cathode alone (625.8 mAh g−1). The S/KB@C3N4/GS cathode shows good cycling life, delivering a discharge capacity as high as 612.4 mAh g−1 for 1 C after 1000 cycles. According to XPS results, the anchoring of the g-C3N4/GS interlayer to Li2Sx can be attributed to a coefficient chemical binding effect of g-C3N4 and graphene on long-chain polysulfides. Generally, the improvement in electrochemical performance originates from a coefficient of the enhanced Li+ diffusion coefficient, increased charge transfer, and the weakening of the shuttle effect of the dissolved Li2Sx as a result of the g-C3N4/GS interlayer. © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

Keyword :

Cathode interlayers Chemical binding Chemical interactions Cycling performance Discharge capacities Electrochemical performance Laminated structures sulfides

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GB/T 7714 Qu, Long , Liu, Pei , Yi, Yikun et al. Enhanced Cycling Performance for Lithium?Sulfur Batteries by a Laminated 2D g-C3N4/Graphene Cathode Interlayer [J]. | ChemSusChem , 2019 , 12 (1) : 213-223 .
MLA Qu, Long et al. "Enhanced Cycling Performance for Lithium?Sulfur Batteries by a Laminated 2D g-C3N4/Graphene Cathode Interlayer" . | ChemSusChem 12 . 1 (2019) : 213-223 .
APA Qu, Long , Liu, Pei , Yi, Yikun , Wang, Tao , Yang, Pu , Tian, Xiaolu et al. Enhanced Cycling Performance for Lithium?Sulfur Batteries by a Laminated 2D g-C3N4/Graphene Cathode Interlayer . | ChemSusChem , 2019 , 12 (1) , 213-223 .
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In situ DRIFTS for the mechanistic studies of 1,4-butanediol dehydration over Yb/Zr catalysts EI
期刊论文 | 2019 , 138-151 | Journal of Catalysis
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Abstract :

To study the effect of acid-base properties of catalysts on 1,4-butanediol (BDO) dehydration to 3-buten-1-ol (BTO), Yb/Zr catalysts with different Yb content were synthesized by a wet impregnation method. The texture property, crystalline form and surface properties of the catalysts were characterized by N2 physisorption, XRD, NH3-TPD, CO2-TPD and in situ DRIFTS. The catalytic performance of BDO dehydration was also tested in a fixed-bed reactor. The experimental results showed that the activity of BDO dehydration and the selectivity of by-product tetrahydrofuran (THF) decreased with the increased Yb content, while the selectivity of the main product BTO gradually increased. The yield of BTO maximized at 64.5% when the Yb content reached 15%, which showed the best catalytic performance. Comprehensive analysis of experimental results showed that the activity of BDO dehydration and the selectivity to the by-product THF were manipulated by the acid sites of the catalysts, while BTO selectivity was tuned by both acid and basic sites of the catalysts. A higher density ratio of basic/acid sites favored the BTO formation and inhibited the formation of by-products THF. The in situ DRIFTS study of BDO dehydration over m-ZrO2 and Yb2O3 elucidated that the hydroxyl groups of BDO molecules first interacted with acid sites to form several types of butoxides. Further abstraction of β-H by basic oxygen anion could convert these butoxides into aldehyde species, which finally reacted to form BTO. The DRIFTS results were consistent with the experimental conclusions that the acid sites of the catalysts could interact with hydroxyl groups and basic sites facilitate the β-H abstraction of BDO and thereby enhancing the formation of BTO. © 2018

Keyword :

1 ,4-Butanediol Acid-base property Catalytic performance Comprehensive analysis Mechanistic studies Situ DRIFT Texture properties Wet impregnation method

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GB/T 7714 Mi, Rongli , Hu, Zhun , Yang, Bolun . In situ DRIFTS for the mechanistic studies of 1,4-butanediol dehydration over Yb/Zr catalysts [J]. | Journal of Catalysis , 2019 : 138-151 .
MLA Mi, Rongli et al. "In situ DRIFTS for the mechanistic studies of 1,4-butanediol dehydration over Yb/Zr catalysts" . | Journal of Catalysis (2019) : 138-151 .
APA Mi, Rongli , Hu, Zhun , Yang, Bolun . In situ DRIFTS for the mechanistic studies of 1,4-butanediol dehydration over Yb/Zr catalysts . | Journal of Catalysis , 2019 , 138-151 .
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Carbon-nanotube/sulfur cathode with in-situ assembled Si3N4/graphene interlayer for high-rate and long cycling-life lithium-sulfur batteries EI SCIE
期刊论文 | 2019 , 296 , 155-164 | Electrochimica Acta
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A Si3N4/graphene composite is designed as an interlayer for a carbon-nanotubes/sulfur cathode to improve electrochemical performance of lithium-sulfur batteries. In the interlayer, Si3N4 nanoparticles suppress the migration of the dissolved polysulfides and graphene sheets construct a 3-dimensional charge-transfer network. The carbon-nanotubes/sulfur@Si3N4/graphene cathode delivers an initial discharge capacity of 1334.7 mAh g−1 at 0.1 C and retains a capacity as high as 745.8 mAh g−1 after 200 cycles, with a capacity fade ratio of 0.22% per cycle. The cathode shows good cycling life, delivering a discharge capacity of 413.3 mAh g−1 for 1 C after 1000 cycles. According to the results of density functional theory calculation, the anchoring of the Si3N4/graphene interlayer to lithium polysulfide can be attributed to a coefficient chemical binding of Li-N and Si-S bonds generating from electronic conjugation effect between the Si3N4 supercell surface and the polysulfides. Generally, the improvement in electrochemical performance originates from the enhancements in Li+ diffusion coefficient and charge transfer, and from the restraining of the shuttle effect of the dissolved lithium polysulfide as a result of the Si3N4/graphene interlayer. © 2018 Elsevier Ltd

Keyword :

Chemical binding Conjugation effects Discharge capacities Electrochemical performance Initial discharge capacities Shuttle effect Sulfur cathodes Transfer network

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GB/T 7714 Qu, Long , Liu, Pei , Zhang, Peng et al. Carbon-nanotube/sulfur cathode with in-situ assembled Si3N4/graphene interlayer for high-rate and long cycling-life lithium-sulfur batteries [J]. | Electrochimica Acta , 2019 , 296 : 155-164 .
MLA Qu, Long et al. "Carbon-nanotube/sulfur cathode with in-situ assembled Si3N4/graphene interlayer for high-rate and long cycling-life lithium-sulfur batteries" . | Electrochimica Acta 296 (2019) : 155-164 .
APA Qu, Long , Liu, Pei , Zhang, Peng , Wang, Tao , Yi, Yikun , Yang, Pu et al. Carbon-nanotube/sulfur cathode with in-situ assembled Si3N4/graphene interlayer for high-rate and long cycling-life lithium-sulfur batteries . | Electrochimica Acta , 2019 , 296 , 155-164 .
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High-Charge Density Polymerized Ionic Networks Boosting High Ionic Conductivity as Quasi-Solid Electrolytes for High-Voltage Batteries. PubMed SCIE
期刊论文 | 2019 , 11 (4) , 4001-4010 | ACS applied materials & interfaces
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Abstract :

Solid-state electrolytes are actively sought for their potential application in energy storage devices, especially lithium metal rechargeable batteries. However, one of the key challenges in the development of solid-state electrolytes is their lower ionic conductivity compared with that of liquid electrolytes (10<sup>-2</sup> S cm<sup>-1</sup> at room temperature), where a large gap still exists. Therefore, the pursuit of high ionic conductivity equal to that of liquid electrolytes remains the main objective for the design of solid-state electrolytes. Here, we show a series of high-charge density polymerized ionic networks as solid-state electrolytes that take inspiration from poly(ionic liquid)s. The obtained quasi-solid electrolyte slice displays an astonishingly high ionic conductivity of 5.89 × 10<sup>-3</sup> S cm<sup>-1</sup> at 25 °C (the highest conductivity among those of the state-of-art polymer gel electrolytes and polymer solid electrolytes) and ultrahigh decomposition potential, >5.2 V versus Li/Li<sup>+</sup>, which are attributed to the continuous ion transport channel formed by an ultrahigh ion density and an enhanced chemical stability endowed by highly cross-linked networks. The Li/LiFePO4 and Li/LiCoO2 batteries (3.0-4.4 V) assembled with the solid electrolytes show high stable capacities of around 155 and 130 mAh g<sup>-1</sup>, respectively. In principle, our work breaks new ground for the design and fabrication of the solid-state electrolytes in various energy conversion devices.

Keyword :

polymer electrolytes solid electrolytes ionic conductivity lithium metal batteries polymerized ionic networks

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GB/T 7714 Tian Xiaolu , Yi Yikun , Yang Pu et al. High-Charge Density Polymerized Ionic Networks Boosting High Ionic Conductivity as Quasi-Solid Electrolytes for High-Voltage Batteries. [J]. | ACS applied materials & interfaces , 2019 , 11 (4) : 4001-4010 .
MLA Tian Xiaolu et al. "High-Charge Density Polymerized Ionic Networks Boosting High Ionic Conductivity as Quasi-Solid Electrolytes for High-Voltage Batteries." . | ACS applied materials & interfaces 11 . 4 (2019) : 4001-4010 .
APA Tian Xiaolu , Yi Yikun , Yang Pu , Liu Pei , Qu Long , Li Mingtao et al. High-Charge Density Polymerized Ionic Networks Boosting High Ionic Conductivity as Quasi-Solid Electrolytes for High-Voltage Batteries. . | ACS applied materials & interfaces , 2019 , 11 (4) , 4001-4010 .
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Research on inhibitors and hindered groups in ultra-deep hydrodesulfurization based on density functional theory EI CPCI-S SCIE Scopus
会议论文 | 2018 , 314 , 170-178 | 17th Congress of Asia-Pacific-Confederation-of-Chemical-Engineering (APCChE)
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Abstract :

Hydrodesulfurization (HDS) of thiophenic sulfur with hindered groups in the presence of inhibitors (nitrogen compounds and H2S) is vital in achieving ultralow sulfur level in gasoline. The objective of this research was to investigate effects of inhibitors and hindered groups on ultra-deep HDS of thiophenic sulfur on Ni2P catalyst in a mechanistic perspective. Density functional calculations were used to investigate adsorption of inhibitors and sulfur compounds combined with thermodynamic analysis. Activation mechanism of sulfur compounds was studied using partial density of state (PDOS) and electron density difference analysis. All species preferred to be adsorbed at the three-fold hollow Ni site and its vicinity. Inhibitors had larger adsorption energy and constant than sulfur compounds. Co-adsorption of thiophene and inhibitors weakened the adsorption of thiophene. Population analysis revealed that some electrons moved to higher energy states suggesting activation. Sulfur compounds adsorbed to Ni2P surface mainly through Ni-S bonds exhibiting characteristics of covalent bonding, originating from the overlapping of 3p states of S and 3d states of Ni. Inhibitors show tendencies to adsorb to Ni2P surface over sulfur compounds. Hindered groups impede adsorption of sulfur compounds and weaken the interaction between sulfur compounds and surface mainly due to steric hinderance.

Keyword :

Thermodynamics Inhibitor Ultra-deep hydrodesulfurization Hindered group Density functional theory

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GB/T 7714 Zhang, Peng , Zhao, Qichen , Liu, Jingjun et al. Research on inhibitors and hindered groups in ultra-deep hydrodesulfurization based on density functional theory [C] . 2018 : 170-178 .
MLA Zhang, Peng et al. "Research on inhibitors and hindered groups in ultra-deep hydrodesulfurization based on density functional theory" . (2018) : 170-178 .
APA Zhang, Peng , Zhao, Qichen , Liu, Jingjun , Yang, Bolun . Research on inhibitors and hindered groups in ultra-deep hydrodesulfurization based on density functional theory . (2018) : 170-178 .
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NiSx Quantum Dots Accelerate Electron Transfer in Cd0.8Zn0.25 Photocatalytic System via an rGO Nanosheet "Bridge" toward Visible-Light-Driven Hydrogen Evolution EI SCIE Scopus
期刊论文 | 2018 , 8 (2) , 1532-1545 | ACS CATALYSIS
WoS CC Cited Count: 12
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Abstract :

Minimizing the charge transfer barrier to realize fast spatial separation of photoexcited electron-hole pairs is of crucial importance for strongly enhancing the photocatalytic H-2 generation activity of photocatalysts. Herein, we propose an electron transfer strategy by reasonable design and fabrication of high-density NiSx quantum dots (QDs) as a highly efficient cocatalyst on the surface of Cd0.8Zn0.2S/rGO nanosheet composites. Under visible-light irradiation, the formation of a two-dimensional (2D) Cd0.8Zn0.2S/rGO nanohybrid system with 2 wt % NiSx loading gave a prominent apparent quantum efficiency (QE) of 20.88% (435 nm) and H-2 evolution rate of 7.84 mmol g(-1) H-1, which is 1.4 times higher than that of Pt/Cd0.8Zn0.2S/rGO. It is believe that the introduced rGO nanosheets and NiSx QDs obviously improved the interfacial conductivity and altered the spatial distribution of electrons in this nanoarchitecture. Thus, the synergistic effects of interfacial junctions result in a regulated electron transportation pathway along the basal planes and ultrafast transfer and spatial separation of photoexcited carriers, which are responsible for the enhanced photocatalytic performance. This work gives a facile and effective strategy to understand and realize rationally designed advanced photocatalysts for high-efficiency, stable, and cost-efficient solar hydrogen evolution applications.

Keyword :

NiSx Cd0.8Zn0.2S/rGO quantum dot nanosheet hydrogen evolution

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GB/T 7714 Xue, Chao , Li, He , An, Hua et al. NiSx Quantum Dots Accelerate Electron Transfer in Cd0.8Zn0.25 Photocatalytic System via an rGO Nanosheet "Bridge" toward Visible-Light-Driven Hydrogen Evolution [J]. | ACS CATALYSIS , 2018 , 8 (2) : 1532-1545 .
MLA Xue, Chao et al. "NiSx Quantum Dots Accelerate Electron Transfer in Cd0.8Zn0.25 Photocatalytic System via an rGO Nanosheet "Bridge" toward Visible-Light-Driven Hydrogen Evolution" . | ACS CATALYSIS 8 . 2 (2018) : 1532-1545 .
APA Xue, Chao , Li, He , An, Hua , Yang, Bolun , Wei, Jinjia , Yang, Guidong . NiSx Quantum Dots Accelerate Electron Transfer in Cd0.8Zn0.25 Photocatalytic System via an rGO Nanosheet "Bridge" toward Visible-Light-Driven Hydrogen Evolution . | ACS CATALYSIS , 2018 , 8 (2) , 1532-1545 .
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Co-pyrolysis behavior of microalgae biomass and low-quality coal: Products distributions, char-surface morphology, and synergistic effects EI SCIE PubMed Scopus
期刊论文 | 2018 , 255 , 238-245 | BIORESOURCE TECHNOLOGY
WoS CC Cited Count: 4 SCOPUS Cited Count: 10
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In this work, the distributions and releasing properties of the primary volatile products during co-pyrolysis of low-rank coal and green algae (GA) has been studied using fixed-bed reactor with online mass spectrometry. Surface morphology of the char was described quantitatively by SEM combined with fractal theory. Different forms of synergistic effects existed from both the yields of products and composition of the main gaseous products. Positive synergistic effects from tar yield were observed under 25% of GA from 600 to 850 degrees C, indicating GA promoted the formation of tar. Opposite synergistic effects on the content of H-2 and CO were gained when the mass ratio of GA was 50%. The fractal dimensions of co-pyrolysis char were less than the calculated values except under 650 degrees C, which meant the GA promoted the homogeneity of char surface. This work could provide essential data for proper operation parameters selecting for co-pyrolysis.

Keyword :

Products distributions Low-quality coal Microalgae biomass Co-pyrolysis Synergistic effects

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GB/T 7714 Wu, Zhiqiang , Yang, Wangcai , Li, Yaowu et al. Co-pyrolysis behavior of microalgae biomass and low-quality coal: Products distributions, char-surface morphology, and synergistic effects [J]. | BIORESOURCE TECHNOLOGY , 2018 , 255 : 238-245 .
MLA Wu, Zhiqiang et al. "Co-pyrolysis behavior of microalgae biomass and low-quality coal: Products distributions, char-surface morphology, and synergistic effects" . | BIORESOURCE TECHNOLOGY 255 (2018) : 238-245 .
APA Wu, Zhiqiang , Yang, Wangcai , Li, Yaowu , Yang, Bolun . Co-pyrolysis behavior of microalgae biomass and low-quality coal: Products distributions, char-surface morphology, and synergistic effects . | BIORESOURCE TECHNOLOGY , 2018 , 255 , 238-245 .
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Solvent-Controlled Reactivity of Au/CeO2 Towards Hydrogenation of p-Chloronitrobenzene EI SCIE Scopus
期刊论文 | 2018 , 148 (5) , 1490-1498 | CATALYSIS LETTERS
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The solvent effect on catalyst activity and selectivity for the hydrogenation of para-Chloronitrobenzene (p-CNB) over Au/CeO2 catalyst was investigated. Reaction over Au/CeO2 generated p-chloroaniline as the sole product, whereas the p-CNB hydrogenation rate extremely hinged on solvent via modification of apparent activation energy (E-a) and pre-exponential factor (A). The apparent activation energy and the pre-exponential factor in different solvents followed the order: ethanol > i-butanol > s-butanol > t-butanol > t-pentanol, which linearly correlated with the hydrogen bond donation ability of solvents. Moreover, the constable plot was firstly found in the solvent effect on supported gold catalyst. From the ATR-FTIR analysis, N-O bond in p-CNB was strongly affected by the solvents via hydrogen bond compared with the benzene ring and C-Cl bond, thereby weaken the adsorption of the p-CNB on Au catalyst, inducing the increment of activity of p-CNB hydrogenation. These findings could provide a criterion to compare the performance of various catalysts in different solvents and a guideline to designate an appropriate solvent. [GRAPHICS] .d

Keyword :

Para-chloronitrobenzene Au catalyst Constable plot Solvent effect Hydrogenation reaction

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GB/T 7714 Hu, Zhun , Tan, Shunquan , Mi, Rongli et al. Solvent-Controlled Reactivity of Au/CeO2 Towards Hydrogenation of p-Chloronitrobenzene [J]. | CATALYSIS LETTERS , 2018 , 148 (5) : 1490-1498 .
MLA Hu, Zhun et al. "Solvent-Controlled Reactivity of Au/CeO2 Towards Hydrogenation of p-Chloronitrobenzene" . | CATALYSIS LETTERS 148 . 5 (2018) : 1490-1498 .
APA Hu, Zhun , Tan, Shunquan , Mi, Rongli , Li, Xiang , Li, Dan , Yang, Bolun . Solvent-Controlled Reactivity of Au/CeO2 Towards Hydrogenation of p-Chloronitrobenzene . | CATALYSIS LETTERS , 2018 , 148 (5) , 1490-1498 .
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