Abstract
The removal of CO from reformate streams by selective CO methanation was investigated over TiO2 supported RuNi bimetallic and monometallic catalysts. The combination of Ru and Ni enhanced CO methanation at low temperatures. The introduction of Ni into Ru/TiO2 decreased the CO2 conversion rate at 260°C from 10 to 7.3μmolmin−1gcat−1. The use of Ru and Ni, thus, expands the temperature range of selective CO methanation. Transmission electron microscopy and temperature programmed reduction by H2 confirmed that Ru species were in close proximity to Ni species on RuNi/TiO2, indicating a decrease in direct contact between Ru and TiO2. Fourier transform infrared spectroscopy techniques revealed that the decomposition of the formate species, formed during CO2 methanation, is slow over RuNi/TiO2, in contrast to Ru/TiO2.
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