关键词: 镍系催化剂, 甲烷, 二氧化钛, 氧化镧

Abstract:

The catalyst carrier for methane production from syngas at high temperature was prepared in a ball mill by mixing method.The catalyst carrier was modified by adding additives TiO₂ and La₂O₃ with different quality.After calcination and loading,methanation reaction was carried out.The mechanical strength and BET of the catalyst was tested,and the catalyst was also characterized by hydrogen temperature-programmed reduction（H₂-TPR）,TPD,TG and XRD etc.,and its methanation catalytic performance was evaluated in a fixed-bed reactor.The results showed that the prepared catalyst could be used stably under the condition of above 600 ℃ and 2 MPa,and had higher catalytic activity,anti-sintering and anti-carbon properties.The addition of TiO₂ could improve the mechanical properties and high temperature resistance of the catalyst,while the addition of La₂O₃ helped to disperse nickel on the surface of the support,increase the activity of the catalyst,reduce the surface acidity of the support,and inhibit the formation of carbon.Thus,the service life of the catalyst could be prolonged.

Key words: nickel-based catalysts, methane, titanium dioxide, lanthanum oxide