27Al multiple-quantum MAS NMR of mechanically treated bayerite (α-Al(OH)3) and silica mixtures

被引:18
作者
Ashbrook, SE
MacKenzie, KJD
Wimperis, S
机构
[1] Univ Exeter, Sch Chem, Exeter EX4 4QD, Devon, England
[2] Univ Oxford, Phys Chem Lab, Oxford OX1 3QZ, England
[3] Ind Res Ltd, Lower Hutt, New Zealand
基金
英国工程与自然科学研究理事会;
关键词
D O I
10.1006/snmr.2001.0032
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Two-dimensional (27)Al multiple-quantum magic angle spinning (MQMAS) NMR experiments are used to study mixtures of bayerite (alpha-Al(OH)(3)) with either silicic acid (SiO(2).nH(2)O) or silica gel (SiO(2)) that have been ground together for varying lengths of time. This mechanical treatment produces changes in the (27)Al MAS and MQMAS NMR spectra that correspond to the formation of new Al species. Mean values of the quadrupolar interaction (P(Q)) and isotropic chemical shift (delta(CS)) are extracted from the two-dimensional (27)Al NMR spectra for each of these species. The presence of significant distributions of both (27)Al quadrupolar and chemical shift parameters is demonstrated and the effect of grinding duration on the magnitudes of these distributions is discussed. (C) 2001 by Academic Press.
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页码:87 / 99
页数:13
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