Partial oxidation of methane to formaldehyde over W/HZSM-5 catalysts

被引：59

作者：

de Lucas, A ^{[1
]}

Valverde, JL ^{[1
]}

Canizares, P ^{[1
]}

Rodriguez, L ^{[1
]}

机构：

[1] Univ Castilla La Mancha, Fac Chem, Dept Chem Engn, Ciudad Real 13004, Spain

来源：

APPLIED CATALYSIS A-GENERAL | 1998年 / 172卷 / 01期

关键词：

oxidation of methane (partial); formaldehyde; W/HZSM-5; catalyst; supported tungsten species;

D O I：

10.1016/S0926-860X(98)00114-8

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 partial oxidation of methane to formaldehyde using molecular oxygen as oxidant was studied over W/HZSM-5 catalysts with tungsten loading varying from 0.3% to 11.9%. The catalysts were characterized by means of XRD, UV diffuse reflectance spectroscopy, BET, TPR and TPD of ammonia. Three different types of supported species were detected: tetrahedral monomeric species, octahedral polymeric species, octahedral polymeric species and WO3 crystallites. The relative amount of each one varies significantly with the tungsten loading. At high contents, a decrease in BET areas due to the partial blocking up of the channels of the zeolite and a lessening of the number of acid sites were observed. It was found that supported tungsten oxide phase possesses active sites to partial oxidation of methane to formaldehyde. HCOH selectivity seems to be dependent on the dispersion and the nature of the tungsten oxide species in the catalyst. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：165 / 176

页数：12

共 35 条

[1] SELECTIVE OXIDATION OF METHANE TO FORMALDEHYDE ON SUPPORTED MOLYBDATE CATALYSTS
BANARES, MA
FIERRO, JLG
[J]. CATALYSIS LETTERS, 1993, 17 (3-4) : 205 - 211
[2] Partial oxidation of methane to formaldehyde on silica-supported transition metal oxide catalysts
Banares, MA
Alemany, LJ
Granados, ML
Faraldos, M
Fierro, JLG
[J]. CATALYSIS TODAY, 1997, 33 (1-3) : 73 - 83
[3] THE PARTIAL OXIDATION OF METHANE ON MOO3/SIO2 CATALYSTS - INFLUENCE OF THE MOLYBDENUM CONTENT AND TYPE OF OXIDANT
BANARES, MA
FIERRO, JLG
MOFFAT, JB
[J]. JOURNAL OF CATALYSIS, 1993, 142 (02) : 406 - 417
[4] DIRECT CONVERSION OF METHANE TO C-1 OXYGENATES OVER MOO3-USY ZEOLITES
BANARES, MA
PAWELEC, B
FIERRO, JLG
[J]. ZEOLITES, 1992, 12 (08): : 882 - 888
[5] EFFECT OF ALKALI-METAL CATIONS ON THE STRUCTURE OF MO(VI) SIO2 CATALYSTS AND ITS RELEVANCE TO THE SELECTIVE OXIDATION OF METHANE AND METHANOL
BANARES, MA
SPENCER, ND
JONES, MD
WACHS, IE
[J]. JOURNAL OF CATALYSIS, 1994, 146 (01) : 204 - 210
[6] SILICA SUPPORTED MOLYBDENA CATALYSTS - CHARACTERIZATION AND METHANE OXIDATION
BARBAUX, Y
ELAMRANI, AR
PAYEN, E
GENGEMBRE, L
BONNELLE, JP
GRZYBOWSKA, B
[J]. APPLIED CATALYSIS, 1988, 44 (1-2): : 117 - 132
[7] Brown M.J., 1991, CATAL TODAY, V8, P305, DOI 10.1016/0920-5861(91)80056-F
[8] DEHYDRO-OLIGOMERIZATION OF METHANE TO ETHYLENE AND AROMATICS OVER MOLYBDENUM/HZSM-5 CATALYST
CHEN, LY
LIN, LW
XU, ZS
LI, XS
ZHANG, T
[J]. JOURNAL OF CATALYSIS, 1995, 157 (01) : 190 - 200
[9] SYNTHESIS OF ZSM-5 ZEOLITES IN THE C2H5OH-NA2O-AL2O3-SIO2-H2O SYSTEM
COSTA, E
UGUINA, MA
DELUCAS, A
BLANES, J
[J]. JOURNAL OF CATALYSIS, 1987, 107 (02) : 317 - 324
[10] ASPECTS OF METHANE CHEMISTRY
CRABTREE, RH
[J]. CHEMICAL REVIEWS, 1995, 95 (04) : 987 - 1007

← 1 2 3 4 →