Issue 77, 2014

Revealing the ameliorating effect of chromium oxide on a carbon nanotube catalyst in propane oxidative dehydrogenation

Abstract

Oxygenized multi-walled carbon nanotubes were modified with chromium oxide and applied in propane oxidative dehydrogenation. A propylene selectivity of 84.0% was obtained at a propane conversion of 19.8% on a Cr-1.5 wt% sample. The beneficial effect of chromium was studied by integrated techniques. X-ray photoelectron spectroscopy, and FT-IR results show that surface oxygen groups were greatly optimized as a result of chromium doping. It was also revealed that chromium improves the oxygen chemisorption properties of the catalyst, whereas the propylene desorption ability was enhanced. The superior catalytic performance was ascribed to the synergistic effect between chromium and CNTs. Moreover, as signaled from in situ FT-IR experiments, surface carbonyl (C[double bond, length as m-dash]O) groups were detected to be the active sites in PODH reaction and the presence of chromium greatly facilitates C[double bond, length as m-dash]O restoration, which as a whole determines the catalytic performance.

Graphical abstract: Revealing the ameliorating effect of chromium oxide on a carbon nanotube catalyst in propane oxidative dehydrogenation

Supplementary files

Article information

Article type
Paper
Submitted
22 Apr 2014
Accepted
26 Aug 2014
First published
26 Aug 2014

RSC Adv., 2014,4, 40776-40781

Author version available

Revealing the ameliorating effect of chromium oxide on a carbon nanotube catalyst in propane oxidative dehydrogenation

F. Ma, S. Chen, H. Zhou, Y. Li and W. Lu, RSC Adv., 2014, 4, 40776 DOI: 10.1039/C4RA03672G

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