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《Chinese Journal of Catalysis》 2001-04
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Molybdate Anion Pillared Mg-Al Hydrotalcite as Precursors for HDS Catalysts Ⅰ. Chemical State and Dispersity of MoO_3 in MoO_3/Mg(Al)O

YANG Xiyao *, XIA Xiaoqiu, WU Nianzu (College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China)  
The molybdate anion-pillared Mg-Al hydrotalcite was synthesized by ion exchange method. The chemical state and dispersity of MoO 3 in the calcined product MoO 3/Mg(Al)O were studied by using XRD and XPS. It was testified that the MoO 3 dispersed as uni-molecular layer on the surface of complex oxide Mg(Al)O and its saturated uni-molecular dispersion capacity is 4 77 μmol/m 2. Beyond this value, the MoO 3 reacts with MgO to form magnesium molybdate bulk phase. By BET determination, it was found that the existence of MoO 3 in MoO 3/Mg(Al)O causes the increase of surface area and pore volume of Mg(Al)O.
【Fund】: 国家自然科学基金 ( 2 95 730 94);; 中国石油化工总公司资助项目
【CateGory Index】: O643.3
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