MOLECULAR MOTIONS AND C-13 CHEMICAL-SHIFT ANISOTROPY OF ACETONE ADSORBED IN H-ZSM-5 ZEOLITE

被引:49
作者
BIAGLOW, AI
GORTE, RJ
WHITE, D
机构
[1] UNIV PENN,DEPT CHEM,PHILADELPHIA,PA 19104
[2] UNIV PENN,DEPT CHEM ENGN,PHILADELPHIA,PA 19104
关键词
D O I
10.1021/j100130a003
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
The adsorption of acetone on H-ZSM-5 at 295 K as a function of surface coverage was studied by observing line shape changes of the C-13 carbonyl carbon shielding tensor. For all coverages below one acetone molecule per Bronsted acid site, the spectrum corresponds to a powder pattern characteristic of a chemical shift anisotropy for static molecules, similar to that of the neat solid. Above one molecule per acid site the powder pattern collapses to a narrow line as a result of rapid random reorientations. The change from a static adsorbent-molecule complex to rapid reorientations is sharp and suggestive of a well-defined acid site.
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页码:7135 / 7137
页数:3
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