A quantitative description of the active sites in the dehydrated acid catalyst HSAPO-34 for the conversion of methanol to olefins

被引:92
作者
Smith, L
Cheetham, AK
Marchese, L
Thomas, JM
Wright, PA
Chen, J
Gianotti, E
机构
[1] UNIV CALIF SANTA BARBARA, MAT RES LAB, SANTA BARBARA, CA 93106 USA
[2] UCL ROYAL INST GREAT BRITAIN, DAVY FARADAY RES LAB, LONDON W1X 4BS, ENGLAND
[3] UNIV TURIN, IFM, DIPARTIMENTO CHIM, I-10125 TURIN, ITALY
关键词
active site; acid site; solid acid; microporous catalyst;
D O I
10.1007/BF00811705
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
A neutron diffraction study of the deuterated form of a microcrystalline specimen of the H(+)SAPO-34 catalyst for converting methanol to light olefins reveals two distinct bridging hydroxyl Bronsted sites. These sites are also identified by IR spectroscopy which distinguishes their acid strength from the shift in O-H frequencies following adsorption of CO at 77 K. Protons attached to the O(4) bridging oxygen (OH distance 0.95 Angstrom) exhibit greater acidity than those attached to O(2) (OH distance 0.91 Angstrom).
引用
收藏
页码:13 / 16
页数:4
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