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Miniaturised gas-to-liquids(GTL)based on modular microchannel reactors provides a feasible solution to associated gas utilization in remote onshore/offshore oil fields.Using nearly cost-free associated gas feedstock means the capital costs can take up the largest proportion of the total product cost1.In this context,reducing reactor cost and improving process reliability are the keys to successful implementation of this technology.In the micro-scale catalytic reactors,catalyst is attached on the channel wall in the form of catalytic washcoat.Modeling of such devices requires correctly accounting for interactions between the simultaneous intra-coating(internal)mass transfer and heterogeneous catalysis on a millisecond timescale.The current contribution investigates the performance of integrated microchannel methane reformers for syngas production,the first stage in GTL.A hybrid modeling scheme is adopted to decouple the governing equations of the reactor wall and channel flow from that of the washcoat,thus tremendously saving computational effort.