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Controlling phase transfer of molybdenum carbides by various metals for highly efficient hydrogen production

查看全文 作　　者：Xingtao [1,2]Sun;Jiafeng [1]Yu;Xin [1,2]Tong;Meng [1,2]Yang;Jixin [1]Zhang;Jian [1]Sun 高影响力作者 机构地区：[1]Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China;[2]University of Chinese Academy of Sciences,Beijing 100049,China高影响力机构 出　　处：《Journal of Energy Chemistry》索引2021年第30卷第11期,共8页高影响力期刊 基　　金：This study was supported by DICP(Grant:DICP 1202012);the Natural Science Foundation of China(22078315);the LiaoNing Revitalization Talents Program(XLYC1907066);the Youth Innovation Promotion Association of Chinese Academy of Sciences(2018214). 摘　　要：The α phase Mo carbide has been widely investigated recently for its high activity in hydrogen production from water gas shift (WGS) reaction. However, high loading of noble metals as well as high economic and environmental cost derived from high-temperature ammonification and carbonization process will lead to high cost of hydrogen production. Thus, the efficient controlling of phase transfer is promising. Herein, metals (Au, Pt, Rh, Cu) with a wide range of loadings were impregnated on flame spray pyrolysis (FSP) made MoO_(3) to produce Mo carbides by one-step carbonization. A breakthrough high metal-normalized hydrogen production rate of 213 mmol H2·gmetal^(-1)·s^(-1) was achieved on 0.025 wt% Rh/MoCx, which was much higher than Pt and Au based Mo carbides ever reported. The addition of trace Rh induced direct MoO_(3) transformation to high purity α-MoC_(1-x) in one-step carbonization instead of two-steps ammonification and carbonization process. In comparison to Rh, the addition of Pt, Au and Cu tend to transfer MoO_(3) into β-Mo2C at the same conditions. Besides, the one with 2 wt% Rh exhibited high stability in WGS reaction even at high temperature (300 ℃) due to its inhibition on carbides oxidation induced by H2O. We demonstrate that it is feasible to control phase transfer of Mo carbides even by trace amount of metals to simplify the production process of catalysts. The catalytic performance improved by Rh in aspects of both activity and stability provides a guide for producing more stable Mo carbides catalysts. 关 键 词：Mo carbides α-MoC1-x Stability WGS Hydrogen production
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