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.
出处
《煤炭转化》
CAS
CSCD
北大核心
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)
关键词
焙烧温度
浆态床
甲烷化催化剂
Ni-SiO2
calcination temperature, slurry bed reactor, methanation catalyst, Ni-SiO2
