An investigation on the role of a Pt/Al{sub 2}O{sub 3} catalyst in the oxidative dehydrogenation of propane in annular reactor
- Politecnico di Milano (Italy). Dipt. di Chimica Industriale e Ingegneria Chimica
- SNAMPROGETTI SpA, San Donato Milanese (Italy)
Oxidative dehydrogenation of propane was studied over a commercial Pt/{gamma}-Al{sub 2}O{sub 3} catalyst using an annular reactor, wherein high space velocities (referred to the catalyst load) and controlled temperature conditions can be realized. The reaction was studied in a wide temperature range. Tests in the presence of the catalyst showed that up to 500 C, only products of combustion were produced; above this temperature olefins were also formed in large amounts. Comparison with additional experiments which were carried out in the absence of the catalyst showed that: (1) the oxidation of propane at low to medium temperatures was purely catalytic; the reaction rate was so fast that in the present annular reactor the catalytic combustion underwent interphase mass transfer control already at 200 C oven T; (2) above 500 C gas-phase oxidative pyrolysis of propane was active and could explain the formation of olefins observed in the catalytic tests. Tests of sensitivity of the product yields upon variation of the catalyst load were performed; while the yields of CO{sub 2}, CO, H{sub 2}O, and H{sub 2} increased with increasing amount of catalyst, the yields of propylene, ethylene, and methane decreased progressively. No positive evidence of heterogeneous formation of olefins was thus provided by the various experiments. The data were coherent with a homogeneous formation of propylene and ethylene.
- OSTI ID:
- 362064
- Journal Information:
- Journal of Catalysis, Vol. 184, Issue 2; Other Information: PBD: 10 Jun 1999
- Country of Publication:
- United States
- Language:
- English
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