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Oxidative dehydrogenation of propane over Co, Ni and Mo mixed oxides/MCM-41 catalysts: Effects of intra- and extra-framework locations of metals on product distributions

Paper ID Volume ID Publish Year Pages File Format Full-Text
53144 46915 2006 7 PDF Available
Title
Oxidative dehydrogenation of propane over Co, Ni and Mo mixed oxides/MCM-41 catalysts: Effects of intra- and extra-framework locations of metals on product distributions
Abstract

A series of mesoporous MCM-41-based catalysts containing single and binary metal oxides (Mo, Co, Ni, NiMo and CoMo) has been prepared with binaries having one metal incorporated into MCM-41 structure while the other impregnated on the walls. A sample of the catalysts was characterized by temperature programmed reduction (TPR), X-ray diffraction (XRD) and BET surface area. The catalysts performances depended on the location of the active component – intra or extra – in MCM-41 framework. At similar level of propane conversions (14%), Mo- and Ni-incorporated MCM-41 exhibited selectivities to olefins (ethylene, propylene, 1-butylene, i-butylene and 1,3-butadiene) of 47.7% and 28.6% respectively. NiMCM-41, in addition exhibited selectivity to 1-pentylene of 12.2%. A catalyst produced by Mo incorporation followed by Ni impregnation (Ni-MoMCM-1) showed selectivity to propylene of 41.7% with no other olefins. When the sequence was reversed (Mo-NiMCM-41), the propylene selectivity was maintained and 10% ethylene and 14% C4-olefins were additionally produced, at similar propane of conversions. The highest olefins yield of 13.4% was obtained on Mo-NiMCM-41. The sequence of incorporation and impregnation of Mo- and Co- showed similar but less significant effects on the catalysts performance than in the case of Mo- and Ni-MCM-41. Thus, the location of the metals in the catalyst framework is a key parameter in determining the products distributions.

Keywords
Propane; Olefins; Oxidative dehydrogenation; Molybdenum; Nickel; Cobalt; MCM-41
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Oxidative dehydrogenation of propane over Co, Ni and Mo mixed oxides/MCM-41 catalysts: Effects of intra- and extra-framework locations of metals on product distributions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 7, Issue 12, December 2006, Pages 990–996
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us