Redox transformations of simple vanadium phosphates: The synthesis of epsilon-VOPO4

被引：49

作者：

Lim, SC ^{[1
]}

Vaughey, JT ^{[1
]}

Harrison, WTA ^{[1
]}

Dussack, LL ^{[1
]}

Jacobson, AJ ^{[1
]}

Johnson, JW ^{[1
]}

机构：

[1] EXXON RES & ENGN CO,ANNANDALE,NJ 08801

来源：

SOLID STATE IONICS | 1996年 / 84卷 / 3-4期

基金：

美国国家科学基金会;

关键词：

vanadium phosphates; redox transformations; hydrothermal synthesis;

D O I：

10.1016/0167-2738(96)00007-0

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 reproducible high yield hydrothermal synthesis of VPO4 . H2O that minimizes the amount of organic species adsorbed on the solid particles has been developed. Oxidation of VPO4 . H2O at less than or equal to 550 degrees C in oxygen has been shown to result in the formation of a new VOPO4 phase that has been designated epsilon-VOPO4. This new VOPO4 phase is structurally distinct but related to the structures of beta-VOPO4 and VPO4 . H2O. All three phases contain chains of corner-shared vanadium oxygen atom octahedra that are bridged by phosphate groups. The fully oxidized epsilon-VOPO4 is reduced to VPO4 . H2O at 150 degrees C by a topotactic reaction with hydrogen in the presence of platinum ('hydrogen spillover').

引用

页码：219 / 226

页数：8

共 21 条

[1] NEW PHASES IN V-P-O CATALYSTS AND THEIR ROLE IN OXIDATION OF BUTANE TO MALEIC-ANHYDRIDE [J].