Acidity characterization of MCM-41 materials using solid-state NMR spectroscopy

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题名:	Acidity characterization of MCM-41 materials using solid-state NMR spectroscopy
作者:	Zhao Q;Chen W.H.;Huang S.J.;Wu Y.C.;Lee H.K.;Liu S.B.
贡献者:	化工系
日期:	2002
上传时间:	2009-12-04 15:40:23 (UTC+8)
摘要:	A comprehensive study has been made on the acid properties of the mesoporous H-AlMCM-41 molecular sieves with varied Si/Al ratios using solid-state NMR techniques, namely by P-31 MAS NMR of the adsorbed trimethylphosphine and trimethylphosphine oxide probe molecules in conjunction with elemental analysis. As the consequence of such combined techniques, which rendered not only qualitative (types and strengths) but also quantitative (concentrations) determinations of acid sites, one type of Lewis acid site and two different Brphinsted acid sites were identified for H-AlMCM-41. Furthermore, based on the results obtained from H-1 and Al-27 MAS NMR of the species associated with structural frameworks, possible formation mechanisms for various acid sites were also proposed.
關聯:	NANOPOROUS MATERIALS III Book Series: PERSPECTIVES IN ANALYTICAL PHILOSOPHY Volume: 141 Pages: 453-458
显示于类别:	[化學工程與材料工程學系暨碩士班] 期刊論文

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