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The difference between borate and phosphate modified carbon nanotubes in isopentane oxidative dehydrogenation

Paper ID Volume ID Publish Year Pages File Format Full-Text
53722 46981 2015 6 PDF Available
Title
The difference between borate and phosphate modified carbon nanotubes in isopentane oxidative dehydrogenation
Abstract

•We compare the differences between borate and phosphate modified CNTs.•Increasing P-loading presents a volcanic distribution in alkene selectivity.•Increasing B-loading presents a platform distribution in alkene selectivity.•Borate is more selective than phosphate to the blockage of active sites.•The synergetic effect of borate and phosphate co-loaded CNTs has not been found.

Borate and phosphate modified carbon nanotubes with different loading amounts are synthesized by a facile impregnation method and used as metal-free catalyst for oxidative dehydrogenation of isopentane. When the loading of borate was less than 5 wt% B2O3 decrease in isopentane conversion and increase in alkene selectivity was observed, whereas with increase in borate loading exceeding 5 wt% B2O3 the conversion and selectivity remain constant. This phenomenon is significantly different from the volcanic distribution of dehydrogenation selectivity of the phosphate modified carbon nanotubes. We propose that borate modification is more selective than phosphate modification toward the blockage of defects and the inhibition of combustion reaction on the CNTs supported by X-ray photoelectron spectroscopy, temperature-programmed desorption and oxidation. The synergetic effect of borate and phosphate has not been observed in the isopentane oxidative dehydrogenation.

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Keywords
Borate; Phosphate; Carbocatalysis; Oxidative dehydrogenation; Isopentane
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The difference between borate and phosphate modified carbon nanotubes in isopentane oxidative dehydrogenation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 249, 1 July 2015, Pages 161–166
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