Characterization of manganese and iron oxides as combustion catalysts for propane and propene

被引:218
作者
Baldi, M
Escribano, VS
Amores, JMG
Milella, F
Busca, G
机构
[1] Univ Genoa, Fac Ingn, Ist Chim, I-16129 Genoa, Italy
[2] Univ Salamanca, Dept Quim Inorgan, E-37008 Salamanca, Spain
[3] Univ Pavia, Dipartimento Ingn Idraul & Ambientale, I-27100 Pavia, Italy
关键词
oxidation; oxy-dehydrogenation; propane; propene; combustion; manganese oxide; iron oxide;
D O I
10.1016/S0926-3373(98)00013-7
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
Mn2O3-Fe2O3 powders have been prepared by a coprecipitation method. The pure compounds have been characterized as constituted of alpha-Fe2O3 (haematite) and alpha-Mn2O3 (bixbyite) while the mixed oxides are constituted of a mixture of haematite- and bixbyite-structure solid solutions. The observed reciprocal solubilities calculated from the XRD patterns approach the thermodynamic ones. alpha-Mn2O3 is more active than alpha-Fe2O3 as catalyst for both propane and propene oxidation. However, alpha-Mn2O3 is less active than Mn3O4 powder. Propene oxidation is in all cases very selective to CO2 while propane oxidation gives rise to significant amounts of propene on alpha-Fe2O3. Mn2O3-Fe2O3 powders are slightly more active than alpha-Mn2O3 as combustion catalysts. The selectivities to propene upon propane oxidation decrease with increasing Mn content. (C) 1998 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:L175 / L182
页数:8
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