摘要
采用共沉淀和水热法合成了不同阴离子粘土前驱型复合氧化物催化材料,样品经XRD,FTIR,TPR,TG-DSC,SEM进行表征。同时考察了铜含量在掺杂和不掺杂稀土时对甲烷催化燃烧的影响,结果发现随含铜量增加催化活性增加;未掺杂La的催化剂在高温下出现失活现象,而掺杂型催化剂稳定性良好。同时,制备方法对催化剂的性能有显著影响,在不同制备前驱物pH的条件下,使用共沉淀和水热法合成的阴离子粘土材料,合成时的pH均对催化剂的活性影响较大;同时焙烧温度对催化活性有不同程度的影响。
Synthesized Cu-based composite oxides derived from anionic clay precursors (hydrotalcites) with co-precipitation and hydrothermal methods, and the precursors and oxides catalysts were characterized by XRD, FTIR, TG-DTG, SEM and TPR technologies. The results of catalytic lean combustion of methane indicate that the lanthanum addition can improve performances of Cu-based composite oxide catalysts derived
from hydrotalcites, such as activity of low temperature and stability on high temperature around 1000 ℃ . The pH of preparing precursors strongly affects the catalytic activity and stability of obtained catalysts. The calcination temperature plays considerable roles on the activity for methane catalytic combustion on different catalysts .
出处
《中国稀土学报》
CAS
CSCD
北大核心
2004年第4期532-537,共6页
Journal of the Chinese Society of Rare Earths
基金
国家863计划资助项目(2001AA324050)
关键词
催化化学
稀土改性
甲烷催化燃烧
阴离子粘土
含铜复合氧化物
镧
catalytic chemistry
rare-earth modification
methane catalytic combustion
anionic clays
composite oxides
lathanium
