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Understanding the promotional effects of trace doped zn in Co/NC for efficient one-pot catalytic conversion of furfural to 2-methyl-tetrahydrofuran

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Journal of Energy Chemistry 2022年第8期31卷 225-233,I0007页

作者： Lei Huang Liqiang Wang Zonghao Zhang Xinpeng Guo Xiaowen Zhang Johnny Muya Chabu Pingle Liu Feiying Tang College of Chemical Engineering Xiangtan UniversityXiangtan 411105HunanChina Henan Province Industrial Technology Research Institute of Resources and Materials School of Material Science and EngineeringZhengzhou UniversityZhengzhou 450001HenanChina Department of Chemistry Faculty of ScienceUniversity of LubumbashiPO Box 1825LubumbashiDRCongo Foshan Green Intelligent Manufacturing Research Institute of Xiangtan University Foshan 528010GuangdongChina

2-methyl-tetrahydrofuran(2-MTHF)is a promising biofuel or fuel additive with excellent burning property,a versatile new-style solvent in organic synthesis,and an important medical *** this work,a one-pot selective conversion of furfural(FA)into 2-MTHF was carried out over zn doped Co/NC *** zn-Co/NC-1 catalyst with trace zn dopant(0.38 wt%)exhibited the best performance(yield of 2-MTHF:93.8%).According to the characterizations,it was found that the zn not only incorporates into the carbon support but also partially dopes into Co ***,theoretical calculations demonstrated that the doping of zn in carbon support can effectively enhance the electron transfer from the support to the metallic Co particle,leading to the electron-rich Co *** presence of zn was found to promote the dissociation of hydrogen and to lower the diffusion barrier of hydrogen atom,in favor of the hydrogenation/hydrodeoxygenation ***,the zn doped models exhibit much lower barrier in breaking C–OH bond of FOL,resulting in higher activity for hydrodeoxygenation of *** theoretical results are consistent with the in situ FT-IR analysis of adsorption substrates and intermediates over zn doped *** work reveals the mechanism of dopant zn tailoring the electronic structure and catalytic performance of active sites,providing a deep insight into the design of economical and high-performance catalysts for hydrogenation/hydrodeoxygenation of biomass feedstocks.

关键词： zn-doping Enhanced electron transfer Biomass upgrade Furfural 2-Methyl-tetrahydrofuran

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Characterization and photoelectrochemical performance of zn-doped TiO_2 films by sol-gel method

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Transactions of Nonferrous Metals Society of China 2016年第8期26卷 2109-2116页

作者： Li-ying QIAO Feng-yu XIE Ming-hui XIE Cai-hua GONG Wei-lang WANG Jia-cheng GAO College of Materials Science and Engineering Chongqing University Chongqing 400045 China National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing 400044 China College of Chemistry and Materials Science Sichuan Normal University Chengdu 610068 China

zn-doped TiO2 (zn?TiO2) thin films were prepared by the sol?gel method on titanium substrates with heat treatment at different temperatures. The effects of heat treatment temperatures and zn doping on the structure, photocathodic protection and photoelectrochemical properties of TiO2 thin films were investigated. It is indicated that the photoelectrical performance of the zn?TiO2 films is enhanced with the addition of zn element compared with the pure-TiO2 film and the largest decline by 897 mV in the electrode potential is achieved under 300 °C heat treatment. SEM?EDS analyses show that zn element is unevenly distributed in zn?TiO2 films; XRD patterns reveal that the grain size of zn?TiO2 is smaller than that of pure-TiO2; FTIR results indicate that zn - O bond forms on zn?TiO2 surface. Ultraviolet visible absorption spectra prove that zn?TiO2 shifts to visible light ***?Shottky curves show that the flat-band potential of zn?TiO2 is more negative and charge carrier density is bigger than that ofpure-TiO2, implying that under the synergy of the width of the space-charge layer, carrier density and flat-band potential, zn?TiO2 with 300 °C heat treatment displays the best photocathodic protection performance.

关键词： TiO2 films zn-doping photocathodic protection photoelectrochemical activity sol.gel method

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