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PP-II-36be seen that at temperatures higher than 200°C, the mass transfer limitationsignificantly influences the CO oxidation rate and appears to be one of the mainfactors that decrease the process selectivity.100801.00.8150170190X co, %60402055000 cm 3 g -1 h -1110000 cm 3 g -1 h -1220000 cm 3 g -1 h -1440000 cm 3 g -1 h -1η0.60.40.2210230T, o C0140 160 180 200 220 240 260T, 0 CFigure 1. CO conversion as a function oftemperature for different total flow rates. Thereactant gas feed (vol. %): 1.5 CO, 1.6 O 2 , 10H 2 O, 20 CO 2 , 65 H 2 and He as a balance.0.00 20 40 60 80 100Coating thickness, μmFigure 2. Estimated effectiveness factor for COoxidation reaction at the entry point of reactoras a function of coating thickness for differenttemperatures. The reactant gas feed (vol. %):1.5 CO, 1.6 O 2 , 10 H 2 O, 20 CO 2 , 65 H 2 and Heas a balance.Mathematical modeling of the microchannel reactor operation was performed.Results of mathematical modeling were in good agreement with the experimentaldata.References[1]. Catal. Today 2007 120 2-20.[2]. Appl. Catal., A 2008 350 53-62.AcknowledgementsThe work was partially supported by grants “UMNIK“ (FASIE), МК-5602.2010.3 (grants ofRussian Federation President) and GC №185 of FFP “SSESIR 2009-2013”.399