Bismuth-containing MCM-41: synthesis, characterization, and catalytic behavior in liquid-phase oxidation of cyclohexane

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• 作者：Qian ; Guang ; Ji ; Dong ; Lu ; Gaomeng ; Zhao ; Rui ; Qi ; Yanxing ; Suo ; Jishuan
• 关键词：Mesoporous molecular sieves ; Bismuth ; Characterization ; Catalyst ; Cyclohexane oxidation
• 刊名：Journal of Catalysis
• 出版年：2005
• 出版时间：June 10, 2005
• 年：2005
• 卷：232
• 期：2
• 页码：378-385
• 全文大小：698 K

文摘

Bismuth-containing MCM-41 was directly synthesized in strongly acidic media with CPBr as the template. It was shown, for the first time, by ICP, XRD, N₂ adsorption/desorption, TEM, SEM, ²⁹Si MAS NMR spectra, UV–vis DRS, and Raman spectroscopy that all of the samples have high surface area and good crystallinity, and all bismuth atoms in Bi-MCM-41 are highly dispersed in the silica-based structure. In addition, XPS spectroscopic data indicate that most of the bismuth enters the internal surface or framework of MCM-41. In the catalytic test, Bi-MCM-41 was found to be a very efficient catalyst for the oxidation of cyclohexane, with oxygen as oxidant, in a solvent-free system, and it behaves truly as a heterogeneous catalyst.