| Kinetics of the Oxidative Dehydrogenation of Isobutane over Cr_2O_3/La_2(CO_3)_3 |
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| 引用本文： | Yanping Sun,Tracey A.Robson,Trevor C.BrownSchool of Biological,Biomedical & Molecular Sciences,University of New England,Armidale,NSW,2351,Australia [Manuscript received July 23,2002, revised August 23,2002]. Kinetics of the Oxidative Dehydrogenation of Isobutane over Cr_2O_3/La_2(CO_3)_3[J]. 天然气化学杂志, 2002, 0(Z1) |
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| 作者姓名： | Yanping Sun Tracey A.Robson Trevor C.BrownSchool of Biological Biomedical & Molecular Sciences University of New England Armidale NSW 2351 Australia [Manuscript received July 23 2002 revised August 23 2002] |
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| 摘 要： | The oxidative dehydrogenation (ODH) of isobutane over Cr2O3/La2(CO3)3 has been investigated in a low-pressure Knudsen cell reactor, under conditions where the kinetics of the primary reaction steps can be accurately determined. By heating the catalyst at a constant rate from 150-300℃, temperature fluctuations due to non-equilibrium adsorption are minimized. The evolved gas profiles show that ODH to isobutene and water is a primary reaction pathway, while carbon dioxide, which forms from the catalyst during reaction, is the only other product. This CO2 evolution may enhance the activity of the catalyst. Isobutene formation proceeds with the participation of lattice oxygen from the Cr2O3/La2(CO3)3 catalyst. The intrinsic Arrhenius rate constant for the ODH of isobutane isk(s-1) = 1011.5±2.2exp{-((55±5) -ΔHads kJmol-1)/RT}The small pre-exponential factor is expected for a concerted mechanism and for such a catalyst with a small surface area and limited porosity.
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Kinetics of the Oxidative Dehydrogenation of Isobutane over Cr_2O_3/La_2(CO_3)_3 |
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| Yanping Sun,Tracey A.Robson,Trevor C.BrownSchool of Biological,Biomedical , Molecular Sciences,University of New England,Armidale,NSW,,Australia [Manuscript received July ,, revised August ,]. Kinetics of the Oxidative Dehydrogenation of Isobutane over Cr_2O_3/La_2(CO_3)_3[J]. Journal of Natural Gas Chemistry, 2002, 0(Z1) |
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| Authors: | Yanping Sun Tracey A.Robson Trevor C.BrownSchool of Biological Biomedical & Molecular Sciences University of New England Armidale NSW Australia [Manuscript received July revised August ] |
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| Abstract: | |
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| Keywords: | catalytic kinetics oxidative dehydrogenation molecular flow isobutane isobutene Cr_2O_3/La_2(CO_3)_3 |
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