Synthesis of Novel Cage-Like Mesoporous Vanadosilicate and Its Efficient Performance for Oxidation Dehydrogenation of Propane

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• 作者：Yong-Mei Liu ; Song-Hai Xie ; Yong Cao ; He-Yong He ; Kang-Nian Fan
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：April 8, 2010
• 年：2010
• 卷：114
• 期：13
• 页码：5941-5946
• 全文大小：226K
• 年卷期：v.114,no.13(April 8, 2010)
• ISSN：1932-7455

文摘

Ordered vanadosilicate mesoporous material with large (15 nm), uniform, novel cage-like mesopores was synthesized under acidic aqueous conditions from tetraethyl orthosilicate in the presence of ammonia vanadiate, using P₁₂₃ with CTAB as cotemplate and TMB as a swelling agent. The catalysts were extensively characterized by a combination of different techniques (N₂ adsorption, small-angle X-ray scattering (SAXS), transmission electron microscope (TEM), UV Raman, and UV−vis spectra) in relation to their performance for oxidation dehydrogenation of propane. SAXS and TEM analysis showed that the as-synthesized vanadosilicate samples have a uniform, well-defined cage-like mesostructure. UV Raman and UV−vis spectra revealed that the vanadium species was isolated and presented as a highly dispersed state in the framework of the vanadosilicate samples. Significantly enhanced catalytic activity was observed for the vanadosilicate catalysts, as compared with the 1.0 V-SBA-15 prepared by conventional impregnation. The enhanced catalytic activity of the vanadosilicate catalyst was attributed to the beneficial presence of a larger amount of isolated and highly dispersed V-species, as well as the cage-like mesoporous structure.