Methane Activation On Oxyhalogenated Rare-Earth Systems : Effect Of Pr3+ Substitution In Laocl Host Structure On Co2 FORMATION

Catalytic activity of LnOX (Ln = Sm, La or Nd; X = Cl or Br) and Ln_1-xLm_xOX (Ln = La and Lm = Pr, 0 x 1) catalysts has been studied using a continuous flow reactor system. Methane oxidation using LnOX results in an increase of CO₂ selectivity in the order Nd > La > Pr > Sm, while using Ln_1-xLm_xOX systems CO₂ selectivity is enhanced by increasing partial lanthanum substitution with praseodymium. A decrease in CO and C₂ hydrocarbons selectivities is also observed at isoconversion. The different compounds structures studied do not change with time under reaction conditions within the temperature range at which the catalysts are stable.