钴负载量和焙烧温度对F-T合成用Co/Al_2O_3催化剂活性的影响

对用于F T合成制液态烃的Co/Al2 O3 催化剂进行了程序升温还原研究 ,确定了合适的还原活化温度 (约6 0 0～ 80 0K) ,同时考察了钴负载量和焙烧温度对催化剂活性的影响 .结果表明 ,钴负载量和焙烧温度对C5+ 收率的影响十分显著 .用CODEX优化软件对钴负载量和催化剂焙烧温度进行了优化 .结果表明 ,比较理想的钴负载量为 11 6 % ,焙烧温度为 6 5 1K .XRD测试结果表明 ,在较高温度焙烧的催化剂由于易生成CoAl2 O4 尖晶石 ,导致催化剂的活性显著降低

Effects of Co Loading and Calcination Temperature on Catalytic Activity of Co/Al_2O_3 for F-T Synthesis

The appropriate reduction temperature of Co/Al 2O 3 catalyst for F T synthesis was chosen by temperature programmed reduction method. In addition, the effects of Co loading and calcination temperature on the catalyst activity was studied. The results indicated that the catalytic activity of the catalyst varied with Co loading and calcination temperature remarkablly. CODEX optimization gave out an optimum Co loading of 11 6% and calcination temperature of 651 K, and estimated C 5+ yield perfectly. The XRD results showed that the high calcination temperature favored the formation of CoAl 2O 4 spinel, which would result in lowering the activity of the catalyst.