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Synthesis of ordered mesoporous carbon materials and their catalytic performance in dehydrogenation of propane to propylene

Paper ID Volume ID Publish Year Pages File Format Full-Text
55479 47055 2012 7 PDF Available
Title
Synthesis of ordered mesoporous carbon materials and their catalytic performance in dehydrogenation of propane to propylene
Abstract

Monolithic mesoporous carbons were prepared through a simple autoclaving method using citric acid as catalyst instead of HCl. The presence of citric acid plays an important role in determining the structural ordering of the resultant mesoporous structure due to the –COOH groups which can enhance hydrogen interaction between structural directing agent of triblock copolymer F127 and polymeric carbon precursor of resorcinol–formaldehyde resins. The obtained carbons have a hexagonal pore system, uniform pore size of ∼5.0 nm and high BET surface area of ∼758 m2/g. The prepared mesoporous carbons were used as catalyst for dehydrogenation of propane, exhibiting high catalytic activity and stability. After 50 h time-on-stream, the propane conversion of 12.1% was observed with propylene selectivity of 95.1% in the direct dehydrogenation process, while the propane conversion of 20.1% with propylene selectivity of 25.8% in oxidative dehydrogenation process. It has been found that the surface basic groups are active sites.

Graphical abstractMonolithic mesoporous carbons were prepared through a simple autoclaving method using citric acid as catalyst which can enhance hydrogen interaction between structural directing agent of triblock copolymer F127 and polymeric carbon precursor of resorcinol–formaldehyde resins. The prepared monolithic carbons without deposition of metal were used as catalyst for dehydrogenation of propane, exhibiting high catalytic activity and stability. After 50 h in steam, the propane conversion of 12.1% was observed with propylene selectivity of 95.1% in the direct dehydrogenation process, while the propane conversion of 20.1% with propylene selectivity of 25.8% in oxidative dehydrogenation process. It has been found that the surface basic groups control the catalytic turnover. The mesoporous carbons are promising as an alternative to metal based catalysts for dehydrogenation reactions of alkanes.Figure optionsDownload full-size imageDownload high-quality image (145 K)Download as PowerPoint slideHighlights► The work is related to mesoporous carbon synthesis and metal-free carbon catalysis, which is of particular interest. ► Ordered mesoporous carbon monoliths are environmentally prepared using citric acid as catalyst. ► The mesoporous carbons can efficiently catalyze dehydrogenation of propane with and without oxygen. ► The stable propylene yield is higher than 12% with propylene selectivity of 92% during direct dehydrogenation of 50 h. ► The mesoporous carbons are promising as an alternative to metal based catalysts for dehydrogenation reactions of alkanes.

Keywords
Ordered mesoporous carbon; Citric acid; Dehydrogenation; Propane; Propylene
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Synthesis of ordered mesoporous carbon materials and their catalytic performance in dehydrogenation of propane to propylene
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 186, Issue 1, 1 June 2012, Pages 35–41
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