First, the catalytic tests were conducted with constant space velocity (WHSV- reactants flow per mass of catalyst) at 30 L.
h1 gcat1 with a fixed amount of 300 mg of catalyst and a CO2:CH4 molar ratio of 1, at temperatures of 600, 650 and 700 C, for the 15%Ni/Al2O3 and 30% Ni/Al2O3 catalysts. Then, tests were performed with different WHSV (15 and 45 L h1 gcat 1) and mass of catalyst (600 and 200 mg), a temperature of 650 C and reaction time of 4 h. For the long during tests, reaction time was extended up to 10 h. The gas product was analyzed in an Agilent 7890A gas chromatograph equipped with a TCD detector