Journal
FUEL
Volume 234, Issue -, Pages 1238-1258Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2018.07.146
Keywords
High-temperature WGS; Biogas dry reforming; Bimetallic catalysts; Ternary metal oxide support
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Hydrogen Canada (H2CAN) strategic network
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Promoted ternary oxide based bimetallic catalysts with nominal composition of 3%Ni5%Cu/CeZrM (where M = La, Mg, Y, Gd or Ca) were prepared by surfactant-assisted route and tested for the high temperature water gas shift reaction. The catalysts were initially screened at 500 degrees C at atmospheric pressure in a packed bed tubular reactor using 30%CO/70%N(2 )gas. The Ca promoted catalyst showed the best performance, and was subsequently tested using simulated reformate gas of composition: 46.2%CO, 8.5%CH4, 7.2%CO2 and 38.1%H-2 (obtained from biogas dry reforming). Effects of catalyst preparation method: (i.e. impregnation method (atmospheric pressure or vacuum), surfactant/metal ratio (S/M = 0-1.25) and calcination temperature (425-650 degrees C) were tested. Operating conditions: (i.e. reaction temperature (450-550 degrees C), steam/CO molar ratio and reactor pressure (atmospheric-250 psi) were also studied. Structure-activity relationships developed to correlate catalyst characteristics to performance showed that catalyst activity was highly dependent on Cu reducibility, support basicity and metal dispersion.
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