柠檬酸对MoO_3/CeO_2-Al_2O_3催化剂耐硫甲烷化性能的影响（英文）  

Effect of citric acid addition on MoO_3/CeO_2-Al_2O_3 catalyst for sulfur-resistant methanation

作　　者：王保伟[1] 孟大钧 王玮涵[1] 李振花[1] 马新宾[1] 

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》2016年第12期1479-1484,共6页Journal of Fuel Chemistry and Technology

基　　金：supported by the National High Technology Research and Development Program of China(863 program,2015AA050504)~~

摘　　要：将柠檬酸(CA)作为络合剂添加至CeO_2-Al_2O_3复合载体中,并考察了CA对MoO_3/CeO_2-Al_2O_3催化剂耐硫甲烷化性能的影响。活性评价结果显示,催化剂活性随柠檬酸添加量的增大而增大,当n(CA)/n(Ce)为3时,CO转化率可达60%。催化剂BET、XRD、H2-TPR及XPS等表征结果表明,在CeO_2-Al_2O_3复合载体中加入CA,可以增大载体及催化剂的比表面积,使Mo物种分散性提高。同时,CA对Ce物种起络合作用,致使催化剂表面Ce元素含量明显增加,进而减弱了活性组分Mo物种与载体间相互作用力,并最终导致了催化剂活性的提升。Citric acid hold great promise to improve the Mo-based catalyst performance for hydrogenation reaction applications. MoO3/CeO2 -Al2O3 catalysts were prepared by impregnation method with adding citric acid into CeO2 -Al2O3 composite supports and tested for sulfur resistant methanation. The syngas methanation activity increased with the increase of citric acid additive amount, and CO conversion could reach up 60% when the molar ratio of citric acid to Ce was 3. The prepared catalysts were characterized by BET, H2-TPR, XRD and XPS. The increased catalytic performance was mainly attributed to the increased amount of Ce species on the surface of catalysts which could decreased the interaction force between MoO3 and CeO2-A l2O3 supports. Additionally, the increased specific surface of CeO2-Al2O3 composite support was also in favor o f catalytic performance.

关 键 词：合成天然气 甲烷化 CEO2 柠檬酸 

分 类 号：O643[理学—物理化学]