Thermodynamic analysis to the reaction system of methanation is given.Reaction mechanism of mathen-ation either for sulfur proof or noon proof, the cause of deac-tivation of catalyst is analyzed.

• 对煤气甲烷化反应体系进行热力学分析,概述耐硫和非耐硫甲烷化的反应机理,剖析耐硫甲烷化催化剂失活的原因。