文献类型：会议论文

英文题名：Palladium supported on hierarchically macro-mesoporous titania for styrene hydrogenation

作者：Zeng, Tian-Ying[1];Zhou, Zhi-Ming[1];Zhu, Jun[1];Cheng, Zhen-Min[1];Yuan, Pei-Qing[1];Yuan, Wei-Kang[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

会议论文集：3rd International Conference on Structured Catalysts and Reactors (ICOSCAR-3)

会议日期：SEP 27-30, 2009

会议地点：Ischia, ITALY

语种：英文

外文关键词：Titania; Hierarchical; Macroporous; Mesoporous; Catalyst; Hydrogenation

摘要：Hierarchically macro-mesoporous titania was synthesized by the simple dropwise addition of tetrabutyl titanate to an ammonia Solution in the absence of surfactant molecules, and then calcined at different temperatures. The as-prepared titania was characterized by X-ray diffraction, N-2 adsorption-desorption analysis and scanning electron microscopy. The results showed that the hierarchically marcro-mesoporous structure of the titania was well preserved after calcination at 650 degrees C, indicating high thermal stability. The 500 degrees C calcined titania with the hierarchically bimodal pore network was impregnated with 0.5 wt.% of palladium and compared with 0.5 wt.% Pd/TiO2 catalyst without such macrochannels. The novel macro-mesostructured Pd/TiO2 catalyst exhibited higher catalytic activity for styrene hydrogenation due to the lower diffusion resistance of species inside the catalyst caused by the hierarchically macro-mesoporous bimodal structure. (C) 2009 Elsevier B.V. All rights reserved.