Methanation Of Carbon Dioxide Over Nickel Ore And Ni/nickel Ore Catalyst

With the improvement of living standard, people need more clean natural gas, but our country's energy reserves is characterized by "rich coal boundary less gas", inefficient utilization of coal and clean natural gas reserves, force us to develop the coal gas technology. Methane in the chemical industry widely used nickel-based catalysts, the nickel is obtained by loading, supports are inert. The supports with rich active components and can effectively influence the process of methanation receive little attention. Nickel ore is a kind of high nickel and iron content, nickel content can be fined by heat treatment. We can use nickel ore to be an effective means to prepare methane catalyst.Original nickel ore and concentrate nickel ore as catalyst raw, the research content mainly includes the relation between nickel ore property change and methanation active by different heat treatment, and on this basis, through the loading of nickel, examines the influence of different catalyst preparation conditions, loads, reaction condition on active methanation, explore the low loads highly active effective way of methanation catalyst preparation.Nickel ore as raw catalyst, through different calcination temperature, can achieve some active. The reaction condition is H2/CO2 to 4:1, the temperature of 400?, the pressure of 0.1 MPa. The results show that the calcination temperature was beneficial to the transfer of the catalyst active component, when calcination temperature is 900?, the activity is the best. The original nickel ore and molding fine nickel carbon dioxide conversion rate reached 26% and 28% respectively. Ni-based catalysts were prepared by impregnation method, with the load of Ni is 4wt%. The effects of support calcination temperature, catalyst calcination temperature, loading and reaction temperature were examined. Results showed that high temperature calcination of supports (1200?), the low temperature of catalyst calcination (350?) is advantageous to the catalyst. The influence of supports calcination temperature on the activity is greater than catalyst calcination temperature. The catalytic active with loading of 6 wt% was best, high loadings could reduce the dispersion of active components. For loaded nickel catalyst of forming fine ore, the carrier under the calcined temperature of 1050 ? has the best active; as the temperature increased from 350? to 500?, carbon dioxide conversion raise first and the declined. The carbon dioxide conversion rate was 81%, the selectivity of methane can be as high as 99%.