Journal
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
Volume 45, Issue 13, Pages 19289-19302Publisher
WILEY
DOI: 10.1002/er.7026
Keywords
ceria promotion; DRM; H-2-production; phosphate-zirconia supported Ni; temperature programmed cyclic experiments
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Funding
- Deanship of Scientific Research at the King Saud University [RGP-119]
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The addition of ceria enhances the surface reducibility and hydrogen yield of nickel catalyst supported on zirconia, but excessive loading of ceria can deteriorate the catalytic performance.
Ceria promoted phosphate-zirconia supported nickel catalyst (10Ni1Ce/PZr; x = 0, 1, 1.5, 2, 2.5, 3, 5 wt%) are prepared and characterized by XRD, SEM, SEM-EDX, CH4-TPSR, NH3-TPD, cyclic H2TPR-CO2TPD-H2TPR, and TPH. Ceria addition induces surface reducibility, exposes reduced phases of NiO and Ni2P2O7 as CH4 decomposition sites, and persuades additional CO2 adsorbed species as formate species over the catalyst surface. It also switches mobile oxygen in the lattice and thereafter oxide vacancy is replenished by oxygen from CO2 to a great extent. Altogether, 1 wt% ceria loading (10Ni1Ce/PZr) ensures more than 90% H-2 yield (H-2/CO = 0.96) whereas 2 wt% ceria loading inputs constancy in catalytic performance up to 440 min TOS. Up to 3 wt% ceria loading, 97% hydrogen yield (H-2/CO similar to 1) is observed. Catalytic performance deteriorated above that 3 wt% ceria loading due to shading the catalytic active site or reoxidation of metallic nickel by excess ceria.
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