摘要
采用模板法制备了有序介孔Al2O3载体,并与购买γ-Al2O3对比。BET表明,有序介孔Al2O3的比表面积为226.95m2·g-1,平均孔径为3.91nm,有序度高。XRD表明,有序介孔Al2O3载体制备的Ni基催化剂cat-P活性组分晶粒小,分散性好。H2-TPR表明,催化剂cat-P的SMSI效应比以采购的γ-Al2O3为载体制备的催化剂更强。稳定性试验表明,cat-P在近50h的实验中表现出很高的活性和稳定性,反应时间内其CH4和CO2转化率分别在90%和95%以上,失活速率仅为0.05%/h。TG-DTG表明,反应后的cat-P催化剂在610℃出现较大的积炭消除峰对应于丝状碳,其不会覆盖催化剂的活性位点。
An ordered mesoporous alumina was prepared by template method, and it was compared with the purchased γ-Al2O3. BET results showed that the specific surface area and average pore diameter of the mesoporous Al2O3 were 226.95m2＆#183;g-1 and 3.91nm, respectively, indicating higher degree of order. XRD results showed that the Ni-based catalyst cat-P prepared by using the prepared ordered mesoporous alumina as support had smaller active component grains, which meant better dispersion. H2-TPR results showed that SMSI effect of the catalyst cat-P was stronger than that of the catalyst prepared by using the purchased γ-Al2O3 as support. Stability tests showed that catalyst cat-P in 50 hour experiments exhibited high activity and stability, and the conversion of CH4 and CO2 were above 90% and 95%, respectively, and the deactivation rate was 0.05% per hour only. From TG-DTG curve, it could be seen that the used cat-P was in whisker form, which didn’t cover the active sites and had little influence on the catalyst stability.
出处
《天然气化工—C1化学与化工》
CAS
CSCD
北大核心
2014年第5期16-21,共6页
Natural Gas Chemical Industry
基金
新疆维吾尔自治区科技支撑计划项目(201232122)
新疆大学博士研究生创新项目(XJUBSCX-2013008)
关键词
有序介孔
氧化铝
模板法
镍基催化剂
甲烷
二氧化碳
干重整
ordered mesoporous
alumina
template method
nickel-based catalyst
methane
carbon dioxide
dry reforming
