Development of catalytic process for biogas upgrading: study of structure and oxygen mobility on Ni And Pt Nanoparticles Encapsulated Catalysts

Abstract

This work evaluates the effect of Ni and Pt encapsulation in the dry reforming of renewable methane from biogas. Results showed that Ni embedded in ceria improved the resistance to sintering along the reduction at high temperature and led to a higher metal-support interaction compared to impregnated catalyst. Doping ceria with Zr increased the oxygen mobility as revealed by oxygen isotopic exchange experiments. The doping with Gd and Sm did not present the same effect, occurring the decrease in ceria reducibility. Ni-based mesoporous mixed CeO2-Al2O3 oxide catalysts presented small metallic Ni particles when it is synthetized with the support. The impregnation post-synthesis leads to the formation of large Ni particles favoring the carbon formation over the 10Ni/CeAl catalyst. The addition of CeO2 increased the oxygen storage capacity of the support. The work with Pt-based catalysts showed the positive effect of embedded structure to enhance the oxygen mobility in the catalyst. The Ni@CeZrO2 and 10Ni-CeO2-Al2O3 catalysts presented high resistance to coke under dry reforming of methane condition.