Journal
TOPICS IN CATALYSIS
Volume 64, Issue 5-6, Pages 414-430Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11244-020-01411-y
Keywords
Molybdenum carbide; Reverse microemulsion; CO2 conversion; Reverse water gas shift
Categories
Funding
- Natural Science and Engineering Research Council [RGPIN-2016-03872, RTI-2017-00119]
- Canada Foundation for Innovation [35772]
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The MoC/gamma-Al2O3 catalyst synthesized via reverse microemulsions showed the highest activity and stability, exhibiting complete selectivity to CO formation and high CO2 conversion rates.
The high surface area (190 m(2)/g) MoC/gamma-Al2O3 catalyst with the MoC nanoparticle size of ca. 2 nm was synthesized via the reverse microemulsion method followed by the thermochemical treatment under CH4/H-2 atmosphere. The catalytic performance of the MoC/gamma-Al2O3 catalyst was evaluated for various temperatures and space velocities, in comparison to the MoC/gamma-Al2O3 catalyst synthesized by wet precipitation and corresponding MoO3/gamma-Al2O3 catalysts. All catalysts showed 100% selectivity to CO generation and CO2 conversions close to equilibrium for 500-600 degrees C (54-58% at 600 degrees C). Through the comprehensive characterization study, it has been found that the MoC/gamma-Al2O3 catalyst synthesized via reverse microemulsions has the highest activity. Characterization study of spent catalysts has shown that MoO3/gamma-Al2O3 is converted to MoC/gamma-Al2O3 under the reaction conditions. Catalyst stability was evaluated for 100 h at 600 degrees C and 60,000 ml/(g h), showing that the reverse microemulsion-based MoC/gamma-Al2O3 catalyst is the most stable, showing CO2 conversion of 59-60%, complete selectivity to CO formation and a negligible extent of carbon formation.
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