Phytic acid-derived fabrication of ultra-small MoP nanoparticles for efficient CO methanation: Effects of P/Mo ratios  

作　　者：Jun Zhao Zijia Yin Baowei Wang Zhenhua Li Yan Xu Xinbin Ma 

机构地区：[1]Key Laboratory for Green Chemical Technology of the Ministry of Education,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China

出　　处：《Journal of Energy Chemistry》2020年第8期248-255,I0009,共9页能源化学（英文版）

基　　金：Financial supports from the National High Technology Research and Development Program of China (863 Project) (2015AA050504)。

摘　　要：Molybdenum phosphide(MoP) catalyst has been widely applied in hydrogenation reactions, while the preparation of unsupported MoP catalysts with ultra-small size and large specific surface area(SBET) is still challenging. Herein, we have provided a facile method for preparing a series of MoP-x(x=P/Mo ratios ranging from 1 to 5) catalysts by pyrolyzing phytic acid(PA)-derived Mo complexes in a H2 atmosphere. The physicochemical properties and the catalytic activity of MoP catalysts were investigated. The results showed that the obtained MoP-5 catalyst had the largest SBETand exhibited ultra-small nanoparticle diameter of 3.6 nm, which ascribed to the chelation of PA and the confinement of deposited products.As the content of PA increased, the synthetic mechanism of MoP was also affected, which led to the difference in the valence of surface Mo species. The characterization results further confirmed that Moδ+ sites in MoP catalysts are active sites for methanation reaction and its content on the surface of MoP-x catalysts determines the catalytic activity.

关 键 词：Molybdenum phosphide Phytic acid P/Mo ratios Ultra-small nanoparticle CO methanation 

分 类 号：TQ529[化学工程—煤化学工程] TQ426