Catalytic combustion of methane in non-permselective membrane reactors with separate reactant feeds [An article from: Chemical Engineering Journal]

This digital document is a journal article from Chemical Engineering Journal, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
Catalytic combustion of methane over Pd and Pt/SiO"2/@a-Al"2O"3 membranes was studied in the temperature range 300-650^oC. Fuel and oxygen were fed at opposite membrane sides. In order to improve reactor controllability the @a-Al"2O"3 membranes were impregnated with SiO"2 sol resulting to smaller pore size. Methane conversions up to 100% for the palladium membrane and up to 42% for the platinum membrane were achieved. The results indicated a transition from kinetic to mass transfer control within the temperature range investigated. This was accompanied by reduction of methane slip from tube to shell side with increasing temperature. CO and H"2 were detected in the product gases of the palladium membrane. Their concentration could be reduced by applying a trans-membrane pressure difference. Low concentrations of CO were observed for the Pt/SiO"2/@a-Al"2O"3 membrane, while no CO or H"2 were detected for a Pd/@a-Al"2O"3 membrane operating in dead-end configuration.