Effect of addition of Cao on NiOjAI20J catalysts over CO methanation reaction.
Abstract
Among NiO/Al2O3 sample 37.7% NiO/Al2O3 catalysts has been indicated to be the most active for CO methanation. The catalyst 37.7% NiO/γ-Al2O3 promoted by CaO with contents 5- 25% have been obtained and studied. Physico-chemical characteristics of the catalysts were deermined by methods of BET. Adsorption, XRD, TPR and Hydrogen Pulse Titration. The activity of the obtained samples were investigated in the reaction of CO methanation at the temperatures of 180 - 220oC and mole ratios H2/CO = 25 - l00. It has been found that the optimal content of CaO for 37.7% NiO/Al2O3 sample is 10.2%. The activity of this catalyst is higher than 37.7% NiO/Al2O3 and 7.5% NiO/TiO2 samples overagely by 11 and 30.5 times, respectively. It can completely convert CO into methane at 180oC.