摘要
分别以镁铝尖晶石和活性炭作为载体制备了负载型铁基高温变换催化剂 ,通过XRD、TEM和活性评价测试 ,考察了催化剂的结构和催化反应性能。以镁铝尖晶石负载γ Fe2 O3制得的催化剂 ,其催化活性明显高于负载α Fe2 O3催化剂 ,当催化剂组成为 :Fe2 O32 6 %,K2 O 2 %,MgO 0 .0 5 %,Cr2 O30 .7%时 ,4 0 0℃下CO转化率为 92 %,35 0℃为 84 %(汽 /气 =1,空速 =2 0 0 0h- 1) ;经氧化处理的活性炭作为催化剂载体时 ,低铬条件下也具有较好的催化活性 ,当负载量为 4 0 %时 ,相同变换反应条件下CO的转化率在 4 0 0℃和 35 0℃下分别为 88%和 80 %。两种催化剂在低Cr2 O3含量时都保持了与传统铁铬系变换催化剂 (B117型 )相当的催化活性 ,对于改善环境具有很大意义。
Iron based high temperature water gas shift (WGS) catalysts supported on MgAl 2O 4 spinel and activated carbon were prepared, respectively. Structures of the catalysts were characterized by means of XRD and TEM techniques and the activity of the catalysts studied. Results showed that these two sorts of catalysts with lower loading of Cr 2O 3 have almost the same catalytic activitiy as traditional Fe Cr WGS catalysts. The activity of γ Fe 2O 3 supported on MgAl 2O 4 spinel is higher than that of α Fe 2O 3 supported on MgAl 2O 4 spinel. The optimal composition is 26% Fe 2O 3, 2% K 2O, 0.05% MgO and 0.7% Cr 2O 3 for maximum WGS activity. Under GHSV 2000 h -1 and steam/gas ratio 1, CO conversion of 92% (at 400℃) and 84% (at 350℃) were obtained. Catalysts supported on oxidized activated carbon with 4% Cr 2O 3 also have excellent activity, with CO conversion of 88% at 400℃ and 80% at 350℃.
出处
《工业催化》
CAS
2002年第6期10-14,共5页
Industrial Catalysis
基金
江苏省教委自然科学基金资助项目
