將檸檬酸(CA)作為絡合劑添加至CeO₂-Al₂O₃復合載體中,并考察了CA對MoO₃/CeO₂-Al₂O₃催化劑耐硫甲烷化性能的影響。活性評價結(jié)果顯示,催化劑活性隨檸檬酸添加量的增大而增大,當n(CA)/n(Ce)為3時,CO轉(zhuǎn)化率可達60%。催化劑BET、XRD、H2-TPR及XPS等表征結(jié)果表明,在CeO₂-Al₂O₃復合載體中加入CA,可以增大載體及催化劑的比表面積,使Mo物種分散性提高。同時,CA對Ce物種起絡合作用,致使催化劑表面Ce元素含量明顯增加,進而減弱了活性組分Mo物種與載體間相互作用力,并最終導致了催化劑活性的提升。

【文章頁數(shù)】：6 頁

【文章目錄】：
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



本文編號：3740038