Selective oxidative dehydrogenation of ethane on MoVTeNbO mixed metal oxide catalysts

被引:232
作者
Botella, P
García-González, E
Dejoz, A
Nieto, JML
Vázquez, MI
González-Calbet, J
机构
[1] Univ Politecn Valencia, CSIC, Inst Tecnol Quim, Valencia 46022, Spain
[2] Univ Complutense Madrid, Fac Ciencias Quim, Dept Quim Inorgan, E-28040 Madrid, Spain
[3] Univ Valencia, Dept Ingn Quim, E-46100 Burjassot, Spain
关键词
selective oxidation of ethane to ethylene; Mo-V-Te-Nb mixed metal oxide catalyst; hydrothermal synthesis; catalyst characterization; X-ray diffraction; SEM-EDX; SAED; HREM; XPS;
D O I
10.1016/j.jcat.2004.04.024
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
MoVTeNbO catalysts, prepared by hydrothermal synthesis, are active and highly selective in the ODH of ethane, especially those with a Mo-V-Te-Nb molar ratio of 1-0.15-0.16-0.17 and heat-treated at 600-650 degreesC. On the best catalyst, selectivities higher than 80% at ethane conversion levels higher than 80% have been obtained operating at relatively low reaction temperatures (340-400 degreesC). Thus, yields of ethylene of ca. 75% have been obtained, which exceeds the best yield reported in the literature. Te(2)M(20)O(57) (M = Mo, V, Nb) and (V,Nb)-substituted theta-Mo(5)O(14), in addition to small amounts of the Te(0.33)Mo(3.33) (M = Mo, V, Nb) phase, can be proposed in the most selective catalysts from XRD, SAED, and HREM results. However, the catalytic performance in ethane oxidation can mainly be related to the presence of the multifunctional Te(2)M(20)O(57) orthorhombic phase in cooperation with the Mo(5)O(14)-type phase. The nature of active and selective sites is discussed. (C) 2004 Elsevier Inc. All rights reserved.
引用
收藏
页码:428 / 438
页数:11
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