CATALYTIC COMBUSTION OF PROPANE IN A MEMBRANE REACTOR WITH SEPARATE FEED OF REACTANTS III. ROLE OF CATALYST LOAD ON REACTOR PERFORMANCE
作者:
GUIDO SARACCO,
JANWILLEM VELDSINK,
GEERTF. VERSTEEG,
WIMP. M. VAN SWAAIJ,
期刊:
Chemical Engineering Communications
(Taylor Available online 1996)
卷期:
Volume 147,
issue 1
页码: 29-42
ISSN:0098-6445
年代: 1996
DOI:10.1080/00986449608936493
出版商: Taylor & Francis Group
关键词: Non-permselective membrane reactor;Catalyst load;Propane combustion
数据来源: Taylor
摘要:
This paper deals with a pilot plant study on the catalytic combustion of propane in a membrane reactor with separate feed of reactants. The importance of the amount of catalyst (1% b.w. Pt on γ-Al2O3), deposited on the pore walls of the membrane, is investigated. Two membranes were prepared by the so called urea method, intruding different amounts of the above catalyst (2% and 4% b.w., respectively) in anα-Al2O3basic porous tubular structure (pore diameter: 0.7 μm; length: 100 mm; internal radius 7 mm; thickness: 3 mm). The performance of the two membranes was tested in a pilot plant, feeding air at one membrane side and a propane/N2mixture at the other side. Either the kinetics- or the transport-controlled operating regimes were investigated, and, in this last case, operation was considered both in presence and in absence of trans-membrane pressure gradients. From this study the catalyst load of the membrane seems to affect seriously the reactor performance. The more the catalyst deposited in the membrane pores, the higher the conversion attainable in the kinetics controlled regime (low temperature operation), and the easier to reach the transport-controlling condition at higher temperatures. However, this last feature is achieved at the price of relatively low overall propane conversions due to the entailed lowering of membrane permeability. Therefore, provided the propane feed concentration and the eventual trans-membrane pressure gradient are not too high, a limited catalyst amount should be employed thus allowing higher membrane permeability and propane conversions, with minor slip of reactants through the membrane.
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