Oxidative Dehydrogenation of Isobutane on Phosphorous-Modified Graphitic Mesoporous Carbon

Journal Article · Sat Jan 01 00:00:00 EST 2011 · Carbon

DOI:https://doi.org/10.1016/j.carbon.2010.10.015· OSTI ID:1018964

Schwartz, Viviane ^[1]; Xie, Hong ^[1]; Meyer, III, Harry M ^[1]; Liang, Chengdu ^[1]

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1. ORNL

Phosphorous heteroatoms were added in order to tune the selectivity and investigate the roles of different oxygen species in graphitic mesoporous carbons for the oxidative dehydrogenation reaction of isobutane to isobutene. Small changes in the apparent isobutane activation energy are consistent with the notion that the phosphorous groups do not change the nature of the active sites but they interfere with the availability of the sites. Our results show that the improvement on selectivity is not proportional to the amount of phosphorous added. Small phosphorous content improved the selectivity by suppressing the combustion of isobutane. However, a higher amount of phosphorous groups lead to coverage of selective quinone sites and/or creation of active sites favorable to total oxidation.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1018964
• Journal Information: Carbon, Vol. 49, Issue 2; ISSN 0008-6223
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
2-METHYLPROPANE
ACTIVATION ENERGY
AVAILABILITY
BENZOQUINONES
CARBON
COMBUSTION
DEHYDROGENATION
OXIDATION
OXYGEN