Hydrogen production from methane through catalytic partial oxidation reactions

This paper reviews recent developments in syn-gas production processes used for partial methane oxidation with and / or without steam. In particular, we examined different process charts _fixed bed, fluidised bed, membrane, etc.., kinds of catalysts powders, foams, monoliths, etc.. and catalytically active phases _Ni, Pt, Rh, etc... The explanation of the various suggested technical solutions accounted for the reaction mechanism that may selectively lead to calibrated mixtures of CO and H2 or to the unwanted formation of products of total oxidation _CO2 and H2O. and pyrolysis _coke.. Moreover, the new classes of catalysts allow the use of small reactors to treat large amounts of methane _monoliths. or separate hydrogen in situ from the other reaction products _membrane.. This leads to higher conversions and selectivity than could have been expected thermodynamically. Although catalysts based on Rh are extremely expensive, they can be used to minimise H2O formation by maximising H2 yield. q2000 Elsevier Science S.A. All rights reserved.