反应气中水对钼基甲烷化催化剂性能的影响  

Influence of water on the methanation performance of Mo-based catalyst

作　　者：李振花[1] 刘晨[1] 谢春芳[1] 王玮涵[1] 王保伟[1] 马新宾[1] LI Zhen- hua LIU Chen XIE Chun- fang WANG Wei-han WANG Bao-wei MA Xin-bin(Key Lab for Green Chemical Technology of Ministry of Education,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,Chin)

机构地区：[1]天津大学化工学院绿色合成与转化教育部重点实验室,天津300072

出　　处：《燃料化学学报》2017年第6期689-696,共8页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(21576203);国家高技术研究发展计划(863计划;2015AA050504)资助~~

摘　　要：在反应温度550℃、空速5 500 h^(-1)、H_2S体积分数1.2%下对所研制的钼基催化剂进行了耐硫甲烷化活性评价,考察了反应气中添加H_2O对Mo基催化剂耐硫甲烷化活性的影响。结果表明,反应气中添加水对Al_2O_3负载的Mo基催化剂可造成不可逆失活,而添加Co助剂及采用铈铝复合载体的催化剂其稳定性、活性得到了改善和提高。Co的添加能保护Mo基催化剂上的活性组分MoS_2,抑制添加水导致的不可逆失活。当反应气中加入水时,催化剂上主要发生水汽变换反应,且随着水含量升高,水汽变换反应速率增大,会严重影响甲烷化反应的进行。此外,随着水含量的增加,其对催化剂的耐硫甲烷化活性和稳定性的影响程度变大。The effects of H2O on the performance of the sulfur-resistant Mo-based methanation catalysts were investigated by adding vapor into the reactant gas at the reaction conditions of 550 ℃,5 500 h^-1,1.2% of H2 S concentration. The results indicate that water caused irreversible deactivation of Mo-based catalyst supported on Al2 O3, while additive Co and cerium-aluminum composite carrier can enhance the activity and improve the stability of the Mo-based catalyst for methanation of syngas. The promoter Co protects the active phase MoS2 of Mo-based catalyst, inhibits the irreversible deactivation caused by the addition of water. When the water content in reactant gas is increased, the water gas shift reaction increases and becomes the main reaction on catalysts, and the increase of water leads to further decrease of the catalyst activity and stability.

关 键 词：耐硫甲烷化 Mo基催化剂 水 水煤气变换 失活 

分 类 号：O643.36[理学—物理化学]