文献类型：期刊文献

英文题名：Effect of Citric Acid on the Synthesis of CO Methanation Catalysts with High Activity and Excellent Stability

作者：Bian, Zhicheng[1]; Xin, Zhong[1,2]; Meng, Xin[1,2]; Tao, Miao[1]; Lv, YuHao[1]; Gu, Jia[1]

机构：[1] Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai, China; [2] State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai, China

年份：2017

卷号：56

期号：9

起止页码：2383

外文期刊名：Industrial and Engineering Chemistry Research

收录：EI(收录号：20171203466206)

语种：英文

外文关键词：High resolution transmission electron microscopy - Methanation - Nickel - Catalyst activity - Scanning electron microscopy - Silica - Hydrogenation - Temperature programmed desorption - Catalyst selectivity - Particle size - X ray diffraction - X ray photoelectron spectroscopy - Nickel compounds

摘要：Several Ni-based SBA-16 catalysts were synthesized by a citric acid (CA)-assisted impregnation method and applied for syngas methanation in a fix-bed reactor. Various characterization techniques (N2 physical adsorption, powder X-ray diffraction, temperature-programmed reduction, temperature-programmed desorption, X-ray photoelectron spectroscopy, transmission electron microscopy, scanning electron microscopy, and ultraviolet-visible spectroscopy) were used to characterize the catalysts. The amount of citric acid has significant influence on the properties of the catalysts. A small amount of CA could improve the dispersion of nickel species and refine the particle size of the catalysts. The refined nickel particles (3-5 nm) could anchor into the pores (6-7 nm) of the silica, which leads to the confinement of nickel particles. The best activity was obtained on Ni/SBA-16-15%CA catalysts with 100% CO conversion and 99.9% CH4 selectivity at 350°C, 0.1 MPa, and 15 000 mL/g/h. The catalysts prepared with CA exhibited excellent stability after being calcined at high temperature, which could be attributed to the refined nickel particles anchored into the pores of the silica. (Figure Presented). ? 2017 American Chemical Society.