焙烧温度对浆态床甲烷化催化剂的影响  

INFLUENCE OF CALCINATION TEMPERATURE ON THE PERFORMANCE OF METHANATIONIN IN SLURRY BED REACTOR

作　　者：贺龙[1] 王永刚[1] 公维博[1] 许德平[1] 杨芳芳[1] 张海永[1] 

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京博士生100083

出　　处：《煤炭转化》2012年第4期72-76,共5页Coal Conversion

基　　金：中国矿业大学(北京)中央高校基本科研业务费专项资金项目(2010yh13)

摘　　要：考察了焙烧温度对Ni-SiO2作为浆态床甲烷化催化剂性能的影响,通过浆态床反应器评价以及TG,TPR,XRD和BET表征,得出Ni-SiO2催化剂在350℃时就完全转化为氧化镍形态.焙烧温度是影响催化剂活性组分粒径大小及比表面积的非常重要的因素.在实验范围内,随着焙烧温度的升高,活性组分的粒径在增大,催化剂的比表面积降低,催化剂(经还原后)的催化活性则先增加后降低.说明对于Ni-SiO2甲烷化催化剂,焙烧温度过高或者过低都会降低催化剂的催化活性,在实验范围内催化剂的焙烧温度在450℃～550℃范围内比较适宜.Effects of the calcination temperatures on the activity of Ni-SiO2 for catalyzing methanation reaction was studied. The experiments were conducted in a slurry bed reactor. The prepared catalysts were characterized by TPR, XRD and BET. The results showed that the active species Ni in catalysts could completely form NiO at 350 ℃. The calcined temperature was a very important factor, affecting both catalyst＇s specific area and particle size of active species. The particle sizes of active components increased while the specific surface area decreased as calcina- tion temperature increased. However, the CH4 yield from the catalysts increased and then de- creased with increasing the calcination temperature from 350 ℃ to 700 ℃. It illustrated that, for the experimental conditions examined, the optimal calcination temperatures of Ni-SiOz catalyst were among 450 ℃-550 ℃, and higher or lower than that would reduce the catalytic activity.

关 键 词：焙烧温度 浆态床 甲烷化催化剂 Ni-SiO2 

分 类 号：TQ051[化学工程] O643.361[理学—物理化学]