Dry reforming of methane with La1-XAXNiO3and LaNi1-XBXO3 (A: Ce or Pr and B: Co or Mg) perovskites as catalysts precursors

Abstract

Perovskite-type LaNiO3 was synthesized by four different methods: autocombustion, sol-gel, calcination of nitrate and freeze-drying. The catalyst that presented the highest activity in terms of conversion of CH4 and CO2to H2/CO was obtained from perovskites synthesized by the autocombustion method. The Co-containing catalysts showed less activity than those with only Ni. This decrease in activity was attributed to the formation of Co-Ni alloy. The Mg-substituted catalysts showed a decrease in carbonaceous deposits due probably to increased basicity of the catalysts. The greatest resistance to the accumulation of carbonaceous deposits was observed on the catalysts containing Ce and Pr, which is attributed to the redox properties of oxides (PrYOX and CeYOX) which facilitate the gasification of carbonaceous deposits formed during the reaction.

Keywords

• methane reforming
• syngas
• freeze-drying
• perovskites