摘要
在用于F T合成的Co/Al2 O3 催化剂中加入少量助剂 ,能够提高CO转化率和C5+ 烃选择性 .主要考察了助剂CeO2 添加量和催化剂焙烧温度等因素对F T合成反应的影响 ,并通过程序升温还原、程序升温氧化及X射线衍射等手段对催化剂进行了表征 .结果表明 ,在Co/Al2 O3 催化剂中加入少量CeO2 (n(Ce) /n(Co) =0 1～ 0 14) ,能够有效提高催化剂的催化活性和C5+ 烃选择性 ;焙烧温度则以相反的趋势控制F T反应活性和链增长几率 ;助剂的加入降低了催化剂的起始还原温度 ,改善了催化剂的还原性能 .但是 ,催化剂的积碳量有所增加 ,经 10h反应后 ,催化剂上存在两种类型的积碳 .
The effects of ceria-loading and calcination temperature on catalytic performance of Co/Al2O3 in Fischer-Tropsch synthesis were studied, and the catalyst samples were characterized by means of temperature-programmed reduction (TPR), temperature-programmed oxidation (TPO) and XRD techniques. The results showed that the addition of small amount of ceria to Co/Al2O3 catalyst (n(Ce)/n(Co) = 0.1 similar to0.14) can increase the CO conversion and C5+ hydrocarbons selectivity, while the calcination temperature can control both the chain growth probability and CO conversion with reverse trend. The TPR and TPO experiments showed that the addition of small amount of ceria can improve the reducibility of the catalyst, but the amount of cabon-deposition increases, and there are two carbon-deposition species on the catalyst after reaction for 10 h.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
2001年第2期104-108,共5页
基金
国家重点基础研究资助!项目 (G19990 2 2 40 4)
中国石油化工股份有限公司资助
关键词
费-托合成
钴催化剂
氧化铝
程序升温还原
程序升温氧化
积碳
二氧化铈助剂
催化活性
Fischer-Tropsch synthesis
ceria
cobalt catalyst
alumina
temperature-programmed reduction
temperature-programmed oxidation
carbon deposition
