A LUMINESCENCE SPECTROSCOPY STUDY ON SUPPORTED VANADIUM AND CHROMIUM-OXIDE CATALYSTS

被引：65

作者：

HAZENKAMP, MF

BLASSE, G

机构：

[1] Debye Research Institute, University of Utrecht, 3508 TA Utrecht

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1992年 / 96卷 / 08期

关键词：

D O I：

10.1021/j100187a049

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 luminescence properties of dehydrated silica- and alumina-supported vanadium and chromium oxide catalysts at low loadings at 4.2 K are reported and discussed. It is shown that one luminescent oxo-vanadium (-chromium) species is present on silica surfaces and more than one species on alumina surfaces. The Cr/Al2O3 sample does not show luminescence. The monomeric tetrahedral species show vibrational structure in their emission spectra, and their decay times amount to 10-30 ms. These luminescence properties are different from those of similar complexes in the solid state. The discrepancy is ascribed to a different electronic structure of the surface species which localizes the excited state in a short metal-oxygen bond.

引用

页码：3442 / 3446

页数：5

共 39 条

[1] PHOTOINDUCED AND PHOTOCATALYTIC REACTIONS ON SUPPORTED METAL-OXIDE CATALYSTS - EXCITED-STATES OF OXIDES AND REACTION INTERMEDIATES [J].