Molybdenum based catalysts .1. MoO2 as the active species in the reforming of hydrocarbons

被引:103
|
作者
Katrib, A
Leflaive, P
Hilaire, L
Maire, G
机构
[1] LERCSI-URA 1498, CNRS-ULP-EHICS, 67070 Strasbourg Cedex, 4, rue Blaise Pascal
关键词
molybdenum dioxide; XPS; argon ion bombardment; reforming of alkanes;
D O I
10.1007/BF00806906
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 XPS spectra of bulk MoO2 and MoO3 are reported. Commercial MoO2 reveals the presence of multilayers of MoO3 covering bulk MoO2. Zn situ reduction of bulk MoO3 by H-2 at temperatures equal to 623 K and less than 673 K reduces the superficial layer(s) to mainly MoO2. Such phase is characterised by a certain density of states in terms of the free 4d, 5s electrons localised mainly on the Mo atoms and observed in the valence band energy region at the Fermi-level in the XP spectrum of this system. Catalytic reactions on the MoO2 phase of 2-methylpentane at atmospheric pressure using a mixture of the hydrocarbon (5 Torr) with hydrogen (755 Torr) yield 3-methylpentane and n-hexane as the main products in roughly equal amounts. These results are interpreted in terms of dual sites on the MoO2 surface.
引用
收藏
页码:95 / 99
页数:5
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