SELECTIVE OXIDATION OF METHANE TO FORMALDEHYDE ON SUPPORTED MOLYBDATE CATALYSTS

被引：42
|
作者：
BANARES, MA [1 ]
FIERRO, JLG [1 ]
机构：
[1] CSIC, INST CATALISIS & PETROEOQUIM, CAMPUS UAM, E-28049 MADRID, SPAIN
来源：
CATALYSIS LETTERS | 1993年 / 17卷 / 3-4期
关键词：
METHANE PARTIAL OXIDATION; SILICA-SUPPORTED MOLYBDATE CATALYSTS; CATALYST CHARACTERIZATION; FTIR OF CHEMISORBED NO; PHOTOELECTRON SPECTROSCOPY;
D O I：
10.1007/BF00766143
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 series of silica-supported molybdena catalysts with variable molybdenum content has been prepared and tested in the selective oxidation of methane to formaldehyde. The nature of the supported oxide phases has been studied by Fourier transform IR of chemisorbed NO molecule, X-ray photoelectron spectroscopy, UV-Visible reflectance and X-ray diffraction techniques. The results show that molybdenum oxide is highly dispersed on the silica at low molybdenum concentrations where two-dimensional polymolybdates are developed. Three-dimensional MoO3 crystals grow in the region of high molybdenum concentrations. The analysis of the combined data suggests that there is a close relationship between methane conversion and formaldehyde selectivity and the presence of highly dispersed polymolybdate structures on the silica surface.
引用
收藏
页码：205 / 211
页数：7
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