Carbon dioxide methanation catalyst Ni/Al2O3 was prepared by the impregnation method using Al2O3 as carrier and Ni as active component.The catalytic performance in the methanation of carbon dioxide in high purity hydrogen chloride was evaluated in an isothermal fixed-bed reactor.The influence of temperature

pressure

hydrogen chloride volume space velocity and molar ratio of hydrogen to carbon dioxide on the conversion of CO2 over the Ni/Al2O3 catalyst was investigated and the catalyst stability and regeneration performance of the catalyst were evaluated.The results showed that the methanation conversion of CO2 was about 90% under the optimal process condition as follows:temperature 250℃

pressure 4.0 MPa

hydrogen chloride volume space velocity 100 h-1 and H2/CO2 molar ratio 500:1

promising satisfactory removal of trace amount of CO2 from high purity hydrogen chloride.The catalyst would rapidly deactivate after the reaction when temperature was higher than 300℃ and catalyst regeneration could only partially restore catalyst activity.