阴离子环境对铁基高温变换催化剂结构与性能的影响

The Effect of Anions on Structure and Catalytic Properties of the Fe-based High Temperature Shift Catalyst

采用湿法共沉淀工艺制备了不同阴离子环境下的铁基高温变换催化剂,利用XRD、BET、TG-DTA、TEM和活性测试等对催化剂样品的结构和性能进行比较研究。结果表明,阴离子环境对催化剂制备过程中所生成前驱体的结构影响较大,最终导致成品催化剂性能相差很大。SO2-4环境下制备的催化剂活性较好,500℃耐热180min后350℃的活性可达24.52%,而Cl-环境下制备的催化剂活性较差,500℃耐热后350℃的活性为6.94%。

The Fe -based high temperature shift catalysts were prepared by the wet co -precipitation method, which were characterized by XRD , SBET and TG-DTA and tested for water-gas shift reaction.The results showed that anions types had significant effects on the structure and performance of precursor which generated during the process of preparation , finally caused product catalyst performance vary widely .The catalytic activity of sample in the SO 2-4 environment was better , which was 24 .52% at 350℃ after heat resistance（500℃,180min）;the catalytic activity of sample in the Cl -environment was lower, which was 6. 94%at 350℃after heating resistance（500℃,180min）.