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Catalytic propane dehydrogenation over In2O3–Ga2O3 mixed oxides

Paper ID Volume ID Publish Year Pages File Format Full-Text
39129 45807 2015 9 PDF Available
Title
Catalytic propane dehydrogenation over In2O3–Ga2O3 mixed oxides
Abstract

•In2O3–Ga2O3 mixed oxides were employed in propane dehydrogenation (PDH).•In–O–Ga linkages improve the dispersion and reducibility of In2O3 domains.•The activities of resulting catalysts are an order of magnitude higher than In2O3–Al2O3.•Agglomeration of In2O3 and formation of In0 may be responsible for loss of activity.

We have investigated the catalytic performance of novel In2O3–Ga2O3 mixed oxides synthesized by the alcoholic-coprecipitation method for propane dehydrogenation (PDH). Reactivity measurements reveal that the activities of In2O3–Ga2O3 catalysts are 1–3-fold (on an active metal basis) and 12–28-fold (on a surface area basis) higher than an In2O3–Al2O3 catalyst in terms of C3H8 conversion. The structure, composition, and surface properties of the In2O3–Ga2O3 catalysts are thoroughly characterized. NH3-TPD shows that the binary oxide system generates more acid sites than the corresponding single-component catalysts. Raman spectroscopy suggests that catalysts that produce coke of a more graphitic nature suppress cracking reactions, leading to higher C3H6 selectivity. Lower reaction temperature also leads to higher C3H6 selectivity by slowing down the rate of side reactions. XRD, XPS, and XANES measurements, strongly suggest that metallic indium and In2O3 clusters are formed on the catalyst surface during the reaction. The agglomeration of In2O3 domains and formation of a metallic indium phase are found to be irreversible under O2 or H2 treatment conditions used here, and may be responsible for loss of activity with increasing time on stream.

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Keywords
Propane dehydrogenation; In2O3; Ga2O3; Mixed metal oxides
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Catalytic propane dehydrogenation over In2O3–Ga2O3 mixed oxides
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 498, 5 June 2015, Pages 167–175
Authors
, , , , , , , , , ,
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