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Oxidative dehydrogenation of propane on Mg-V-Al mixed oxides

Paper ID Volume ID Publish Year Pages File Format Full-Text
43018 45951 2008 6 PDF Available
Title
Oxidative dehydrogenation of propane on Mg-V-Al mixed oxides
Abstract

Vanadium-magnesium mixed oxides have been prepared by thermal decomposition of decavanadate-intercalated Mg, Al layered double hydroxides (LDHs), MgAlVO-LDH, and by impregnation of MgO (mixed, MgAlVO-I, or not, MgVO-I, with Al2O3) with an aqueous decavanadate solution. The activity of catalyst MgAlVO-LDH in oxidative dehydrogenation of propane is higher than that measured for the mixed oxides obtained by conventional impregnation. However, the largest normalised conversion measured over sample MgAlVO-I is assigned to the higher surface density of V centers, which are stabilised along the reaction runs. Normalised selectivity and conversion profiles show that propene is first formed and then oxidized to CO on catalyst MgAlVO-I, a process favoured by the high acidity of this solid. However, catalyst MgVO-I, with a medium strength surface acidity, is rapidly deactivated, forming CO2, by coke deposition on exposed V sites. The low selectivity to propene of catalyst MgAlVO-LDH is related to its low surface density of V sites.

Graphical abstractVanadium-magnesium mixed oxides have been prepared by thermal decomposition of decavanadate-intercalated Mg, Al LDHs and by impregnation of MgO or without Al2O3 with a decavanadate solution, and they have tested for ODH of propane. The differences observed for the catalytic behaviour are mainly related to their acid properties, increased by Al3+ decreasing the selectivity to propene.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Layered double hydroxides (LDHs); Oxidative dehydrogenation (ODH) of propane to propene; Mg-V mixed oxides
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 342, Issues 1–2, 30 June 2008, Pages 93–98
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
Price after discount Only $4.95
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