Selective hydrogenation of CO2 and CO to useful light olefins over octahedral molecular sieve manganese oxide supported iron catalysts

CATEGORY: OLEFINS
Applied Catalysis B: Environmental, Volumes 132–133, 27 March 2013, Pages 54–61
Selective hydrogenation of CO2 and CO to useful light olefins over octahedral molecular sieve manganese oxide supported iron catalysts
Boxun Hu (a), Samuel Frueh (b), Hector F. Garces (a), Lichun Zhang (a), Mark Aindowa, Christopher Brooks (c), Eric Kreidler (c), Steven L. Suib (a), (b)
a Institute of Material Science, University of Connecticut, Storrs, CT 06269, USA
b Department of Chemistry, University of Connecticut, Storrs, CT 06269, USA
c Honda Research Institute USA, Inc. 1381 Kinnear Road, Suite 116, Columbus, OH 43212, USA
Abstract
Researchers created porous cryptomelane-type octahedral molecular sieve manganese oxide (K-OMS-2) supported iron nanocatalysts for selective hydrogenation of CO2 and CO to light olefins.
Surface coated iron (SCI) catalysts and frame-work doped iron (FDI) catalysts have different interfaces. The synergistic interactions of nano-size iron carbides, potassium promoters, and manganese oxides vary in these two types of the Fischer-Tropsch (F-T) catalysts with respect to their catalytic activities and selectivity.
SCI catalysts, for example, have high selectivity to light olefins but low catalytic activity with a CO conversion of 45% and a CO2 conversion of 32%. FDI catalysts exhibit higher catalytic activities with a CO conversion of 87% and a CO2 conversion of 45%. Researchers used direct analyses in real time-mass spectra and temperature programmed reduction-mass spectra to correlate temperature effects. These component–structure–activity relationships provide insight for CO2 utilization and F-T syntheses.
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