不同助剂掺杂的铬基催化剂的制备及其对乙烷氧化脱氢的催化性能

以硝酸盐作为前驱体，Al₂O₃为载体，采用等体积浸渍法制备了系列不同助剂（Mn, Co, Ce）及不同助剂含量（1%, 3%, 5%, 7%, 10%）掺杂的铬基催化剂，其结构经X-射线粉末衍射(XRD)、 H₂程序升温还原(H₂-TPR)和CO₂程序升温脱附（CO₂-TPD）表征。并考察了催化剂对乙烷氧化脱氢反应的催化性能。结果表明：添加Co助剂有利于活性组分铬的分散，10Cr₃Co/γ-Al₂O₃催化剂表现出最佳催化性能，在反应温度为650 ℃， V(CO₂) ：V(C₂H₆)=3 ：1，空速(GHSV)为3 600 mL·（g·h）^-1条件下,在该催化剂上乙烯产率为36.5%。

Preparation of Chromium Catalysts with Different Promoters and Their Catalytic Performance for Oxidative Dehydrogenation of Ethane

A series of Cr-Me/γ-Al2 O3 catalysts with different promoters ( Mn, Co, Ce) and different Co loadings were prepared via impregnation method .The catalysts were characterized by X-ray diffrac-tion(XRD), H2 temperature-programmed reduction(H2-TPR) and CO2 temperature programmed de-sorption ( CO2-TPD) .The catalytic performance of the catalysts in the oxidative dehydrogenation of eth -ane with CO2 was investigated .The results showed that the modified Cr-Co/γ-Al2 O3 is advantageous to the dispersion of chromium .The optimal reaction conditions were as followed: V ( CO2 ) :V ( C2 H6 ) was 3 :1, and space velocity(GHSV) was 3600 mL· (g· h) -1, reaction at 650 ℃.10Cr-3Co/γ-Al2 O3 catalyst showed the best catalytic performance of oxidative dehydrogenation of ethane with the ethylene yield of 36.5 %.