425410 Methane Dry Reforming at Low Temperatures over Pt-Ni-Mg/Ceria-Zirconia Catalysts

Thursday, November 12, 2015: 1:50 PM
355D (Salt Palace Convention Center)
Nada Elsayed, Babu Joseph and John N. Kuhn, Chemical & Biomedical Engineering, University of South Florida, Tampa, FL

Low temperature dry reforming of methane was studied over platinum (0.2-2 wt. %) and/or nickel (8 wt. %) and magnesium (8 wt. %) immobilized onto a ceria-zirconia support. XRD patterns demonstrated that the support (Ce0.6Zr0.4) was a cubic fluorite structure and Ni and Mg were immobilized onto it. Temperature-programmed reduction showed that Pt addition significantly decreased the reduction temperature and the impact became less prominent with increasing Pt loading. The Ni-Mg/(Ce0.6Zr0.4)O2 had the highest number of basic sites and the amount decreased with the addition of platinum. The lowest CH4 and CO2 conversion (X10) temperatures were achieved at 454°C and 437°C respectively using a 0.5%Pt-Ni-Mg/(Ce0.6Zr0.4)O2 catalyst. Dry reforming experiments also indicated that Pt decreased the reaction onset temperature for methane and CO2 and correlated to a slight decrease in the H2:CO ratio (though still higher than for the 0.5%Pt- Ce0.6Zr0.4O2 control catalyst). Steady-state reaction experiments were conducted between 430 and 470°C for the best catalyst and the results showed TOFs increasing from 2.69 to 4.74s-1 with increasing temperature and minimal deactivation when left on stream for 100.5 hours.

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