CO2 AS RAW MATERIAL FOR THE PRODUCTION OF METHANE
The use of CO2 as chemical feedstock is limited to a few processes: synthesis of urea (for nitrogen fertilizers and plastics), salicylic acid (a pharmaceutical ingredient), and polycarbonates (for plastics). In this context, the hydrogenation of CO2 to methane is a major catalytic goal. The methanation of carbon dioxide has a range of applications including: i) the purification of synthesis gas for the production of ammonia, ii) the production of syngas or iii) their use to convert the Martian CO2 atmosphere into CH4 and H2O for fuel and astronaut life support systems. In this work, production of methane was achieved in a continuous atmospheric pressure flow reactor using carbon dioxide and hydrogen as reagents (250 - 500 oC, GHSV=15000 mLCO2/g.h and H2/CO2=4 mol:mol). The results confirm the potentialities of the bimetallic oxides and intermetallic compounds containing f-block elements as catalysts, especially when compared with the behavior of a commercial rhodium hydrogenation catalyst (5%Rh/Al2O3) used as reference. The Figure shows the results of methane synthesis over nanoparticles of nickel bimetallic oxides containing f block elements at 400 oC.