柠檬酸对MoO 3 /CeO 2 -Al 2 O 3 催化剂耐硫甲烷化性能的影响(英文)

发布时间：2023-02-11 08:21

　　将柠檬酸(CA)作为络合剂添加至CeO₂-Al₂O₃复合载体中,并考察了CA对MoO₃/CeO₂-Al₂O₃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CeO₂-Al₂O₃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。

【文章页数】：6 页

【文章目录】：
1 Experimental
    1.1 Composite support preparation
    1.2 Catalyst preparation
    1.3 Catalyst characterization
        1.3.1 N2physisorption analysis
        1.3.2 X-ray diffraction analysis
        1.3.3 H2-temperature-programmed reduction analysis
        1.3.4 X-ray photoelectron spectroscopy analysis
        1.3.5 Catalytic activity evaluation
2 Re sults
    2.1 N2physisorption
    2.2 XRD analysis
    2.3 H2-TPR analysis
    2.4 XPS analysis
    2.5 Catalytic activity evaluation
3 Discussions
    3.1 Effect of citric acid addition on the CeAl support and Mo/CeAl catalyst preparation
    3.2 Influence of the additive amount of citric acid on catalytic activity of Mo/CeAl catalyst
4 Conclusions



本文编号：3740038