Effect of boron addition on the MoO_3/CeO_2–Al_2O_3 catalyst in the sulfur-resistant methanation  

作　　者：Baowei Wang Wenxia Yu Weihan 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

出　　处：《Chinese Journal of Chemical Engineering》2018年第3期509-513,共5页中国化学工程学报（英文版）

基　　金：Supported by the National High Technology Research and Development Program of China(863 Project)(2015AA050504);the National Natural Science Foundation of China(21576203)

摘　　要：The effect of boron on the performance of MoO_3/CeO_2–Al_2O_3 catalysts, which were prepared with impregnation method, was investigated. The catalysts were characterized with N_2 adsorption–desorption, XRD, H_2-TPR, and NH_3-TPD, and were tested in sulfur-resistant methanation. The results indicated that the MoO_3/CeO_2–Al_2O_3 catalysts modified by boron showed higher catalytic performance in sulfur-resistant methanation. The CO conversion increased from 47% to 62% with 0.5 wt% boron content. When the content of boron was under 0.5 wt%, the results suggested there was an increase in the amorphous form of MoO_3 caused by the generation of weak and intermediate acid sites, which had weakened the interaction between the active components and supports. While, the catalyst added 2.0 wt% boron showed the strong acid sites and the largest crystalline size resulting in the uneven distribution of ceria.The effect of boron on the performance of MoO3/CeO2-Al2O3 catalysts, which were prepared with impregnation method, was investigated. The catalysts were characterized with N2 adsorption-desorption, XRD, H2-TPR, and NH3-TPD, and were tested in sulfur-resistant methanation. The results indicated that the MoO3/CeO2-Al2O3 catalysts modified by boron showed higher catalytic performance in sulfur-resistant methanation. The CO conversion increased from 47% to 62% with 0.5 wt% boron content. When the content of boron was under 0.5 wt%, the results suggested there was an increase in the amorphous form of MoO3 caused by the generation of weak and intermediate acid sites, which had weakened the interaction between the active components and supports. While, the catalyst added 2.0 wt% boron showed the strong acid sites and the largest crystalline size resulting in the uneven distribution of ceria.

关 键 词：Boron Sulfur-resistant Methanation Mo-based catalyst Composite support 

分 类 号：O643.36[理学—物理化学]