Acid sites in mesoporous Al-SBA-15 material as revealed by solid-state NMR spectroscopy

CORC > 武汉物理与数学研究所 > 中国科学院武汉物理与数学研究所 > 2011年以前论文发表（包括2011年）

	Acid sites in mesoporous Al-SBA-15 material as revealed by solid-state NMR spectroscopy
	Hu, W; Luo, Q; Su, YC; Chen, L; Yue, Y; Ye, CH; Deng, F
刊名	MICROPOROUS AND MESOPOROUS MATERIALS
	2006-06-20
卷号	92 期号:1-3 页码:22-30
关键词	solid-state NMR Al-SBA-15 zeolites Bronsted acid sites bridging hydroxyl groups
英文摘要	The nature of acid sites in Al-SBA-15 materials with various Si/Al ratios was studied by various NMR techniques including Al-27, Si-29, H-1, P-31 MAS (magic-angle spinning), and some double-resonance methods such as H-1/Al-27 transfer of population in double resonance (TRAPDOR). XRD and Al-27 NMR results indicate that Al has been successfully incorporated into the framework of SBA-15 materials by post-synthesis method. The bridging hydroxyl groups (SiOHAl) associated with Bronsted acid sites are invisible either in 1H MAS or in H-1/Al-27 TRAPDOR spectra of the dehydrated Al-SBA-15 materials. However, after the adsorption of basic probe molecules, such as trimethylphosphine oxide (TWO), trimethylphosphine (TMP) and acetone, P-31 MAS and C-13 CP MAS NMR experiments strongly support the presence of Bronsted acid sites. NMR results suggest that Bronsted acid sites in dehydrated Al-SBA-15 materials are in the form of terminal silanol groups in the vicinity of aluminum atoms that can be induced to generate the bridging hydroxyl groups by the adsorbed basic probe molecules. Although the acid strength of Al-SBA-15 materials detected by different probe molecules is different, it is comparable to that of microporous zeolites. It is noteworthy that no Lewis acid site can be found in the Al-SBA-15 materials. (c) 2006 Elsevier Inc. All rights reserved.
WOS标题词	Science & Technology ; Physical Sciences ; Technology
类目[WOS]	Chemistry, Applied ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
研究领域[WOS]	Chemistry ; Science & Technology - Other Topics ; Materials Science
关键词[WOS]	DOUBLE-RESONANCE NMR ; C-13 CHEMICAL-SHIFT ; PROBE MOLECULE TRIMETHYLPHOSPHINE ; H-1/AL-27 TRAPDOR NMR ; ZEOLITE HY ; ALSBA-15 CATALYSTS ; FRAMEWORK ALUMINUM ; COUPLING-CONSTANT ; BRONSTED ACIDITY ; MCM-41
收录类别	SCI
语种	英语
WOS记录号	WOS:000238473200003
公开日期	2015-07-28
内容类型	期刊论文
源URL	[http://ir.wipm.ac.cn/handle/112942/4799]
专题	武汉物理与数学研究所_2011年以前论文发表（包括2011年）
作者单位	Chinese Acad Sci, Wuhan Inst Phys & Math, State Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan 430071, Peoples R China
推荐引用方式 GB/T 7714	Hu, W,Luo, Q,Su, YC,et al. Acid sites in mesoporous Al-SBA-15 material as revealed by solid-state NMR spectroscopy[J]. MICROPOROUS AND MESOPOROUS MATERIALS,2006,92(1-3):22-30.
APA	Hu, W.,Luo, Q.,Su, YC.,Chen, L.,Yue, Y.,...&Deng, F.(2006).Acid sites in mesoporous Al-SBA-15 material as revealed by solid-state NMR spectroscopy.MICROPOROUS AND MESOPOROUS MATERIALS,92(1-3),22-30.
MLA	Hu, W,et al."Acid sites in mesoporous Al-SBA-15 material as revealed by solid-state NMR spectroscopy".MICROPOROUS AND MESOPOROUS MATERIALS 92.1-3(2006):22-30.