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

Authors: Boxun Hu, Samuel Frueh, Hector F. Garces, Lichun Zhang, Mark Aindow, Christopher Brooks, Eric Kreidler, Steven L. Suib

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 differentinterfaces. 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.

Keywords:
Carbon dioxide utilization
DART
Olefin
Fischer-Tropsch
Manganese oxide

Published in: Applied Catalysis B: Environmental (Volumes 132–133, Pages 1-552, 27 March 2013)

Publisher: Elsevier  

ISSN Information: 0926-3373

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

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