OXIDATION-STATES OF VANADIUM IN V-P-O OXIDATION CATALYSTS - P-31-NMR BY SPIN-ECHO MAPPING

被引：58
|
作者：
LI, J
LASHIER, ME
SCHRADER, GL
GERSTEIN, BC
机构：
[1] IOWA STATE UNIV SCI & TECHNOL, DEPT CHEM, AMES, IA 50011 USA
[2] IOWA STATE UNIV SCI & TECHNOL, DEPT CHEM ENGN, AMES, IA 50011 USA
来源：
APPLIED CATALYSIS | 1991年 / 73卷 / 01期
关键词：
CATALYST CHARACTERIZATION (P-31-NMR); NORMAL-BUTANE; OXIDATION CATALYSTS; OXIDATION STATES; VANADIUM-PHOSPHORUS OXIDES;
D O I：
10.1016/0166-9834(91)85114-B
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 oxidation state of vanadium in V-P-O catalysts before and after use has been examined using P-31 NMR spin echo mapping. The presence of V4+ and V5+ species could be detected for beta-VOPO4, (VO)2P2O7 and industrially-related materials with P/V = 0.9, 1.0, and 1.1. Magnetic susceptibility measurements were used to confirm the presence of para-magnetic vanadium in most catalysts which had been exposed to n-butane or 1-butene. Several models of active V-P-O catalysts have been offered previously which can be related to the NMR results.
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页码：83 / 95
页数：13
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