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

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

Journal Article

Abstract

​​Porous cryptomelane-type octahedral molecular sieve manganese oxide (K-OMS-2) supported iron nanocatalysts have been developed 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. For example, the SCI catalysts have high selectivity (>95%) to light olefins but low catalytic activity with a CO conversion of 45% and a CO2 conversion of 32%. The FDI catalysts showed higher catalytic activities with a CO conversion of 87% and a CO2 conversion of 45%. Direct analyses in real time-mass spectra and temperature programmed reduction-mass spectra have been used to correlate temperature effects. These component–structure–activity relationships provide insight for CO2 utilization and F-T syntheses.

Details

PUBLISHED IN
Applied Catalysis B-Environmental 132, 54-61
PUBLICATION DATE
27 de nov. 2012
AUTHORS
B. Hu, S. Frueh, H. Garces, L. Zhang, M. Aindow, C. Brooks, E. Kreidler, S. Suib