【摘要】 采用一系列金属氧化物助剂(Ce,Sn,Zn,V,La,C r,Fe,Zr,M n的氧化物)对Pt/γ-A l2O3催化剂进行修饰,通过丙烷催化脱氢反应考察了不同助剂对Pt/γ-A l2O3催化剂脱氢性能的影响。研究结果表明,经修饰的Pt/γ-A l2O3催化剂的脱氢性能有不同程度的改善。加入CeO2,SnO2,ZrO2助剂,Pt/γ-A l2O3催化剂的丙烷脱氢活性显著提高,丙烷的初始转化率分别提高了9.2%,8.2%,8.1%;加入ZnO助剂,丙烯选择性显著提高,丙烯初始选择性高达97%;SnO2助剂对改善Pt/γ-A l2O3催化剂的稳定性效果最好。采用氢气程序升温还原对催化剂进行表征,表征结果显示,金属氧化物助剂经还原后仍以氧化态形式存在,未以单质形式与铂形成合金。更多还原

【Abstract】 Effect of several oxide promoters（oxides of Ce,Sn,Zn,V,La,Cr,Fe,Zr and Mn）on dehydrogenation of propane over Pt/γ-Al₂O₃ catalyst was investigated.Most of promoters could improve catalytic performance of Pt/γ-Al₂O₃ in propane dehydrogenation.Addition of CeO₂,SnO₂ and ZrO₂ to Pt/γ-Al₂O₃ catalyst could greatly increased its activity and initial conversion of propane could be raised from 34.10% to 43.26%,42.27% and 42.18% respectively over catalysts with above promoters.The initial selectivity to propylene could reach 97% when dehydrogenation was carried out over Pt-based catalyst containing ZnO promoter.Addition of SnO₂ promoter to Pt-based catalyst made the catalyst the most stable in propane dehydrogenation.The catalysts were characterized by means of temperature-programmed hydrogen reduction（H₂-TPR）.The results indicated that promoters still existed in oxidative state after catalyst was reduced and Pt-alloy did not form.Performance of the catalyst could therefore be improved.更多还原