摘要
采用水热法制备了微孔-介孔分子筛,并以Ce掺杂改性后制备了Co3O4/Ce-微孔-介孔分子筛催化剂,考察了Ce掺杂微孔-介孔分子筛催化剂对苯催化完全氧化性能的影响,并采用BET,XRD,TPR等技术对催化剂进行了表征。研究结果表明:Ce的加入有利于提高MSZ-B催化剂的催化活性。XRD分析显示Ce的加入不会阻塞Co3O4在微孔-介孔分子筛孔道内的分布;TPR分析表明:Ce的加入提高了MSZ-B催化剂的可还原性能,催化剂的可还原性能是影响催化活性的主要因素;另外,介孔的存在不利于Ce改性Co3O4/ZSM-5微孔分子筛催化剂活性的提高。
The micro-mesoporous molecular sieve was synthesized by hydrothermal synthesis method and Co3O4/Ce-micro-mesoporous molecular sieve catalysts were prepared by doping Ce on micro-mesoporous molecular sieve.The performance of its complete catalytic oxidation on the benzene was investigated,and the catalysts were characterized by nitrogen adsorption-desorption,X-ray diffraction（XRD）,and temperature programmed reduction（TPR） techniques.The results showed that the addition of Ce increased the activities of Co3O4/MSZ-B.The XRD results showed that the distribution of Co3O4 in the micro-mesoporous molecular sieve was not blocked by the addition of Ce.The TPR results revealed that the addition of Ce increased the reducibility of the Co3O4/MSZ-B,and the reducibility of catalysts played a key role in the activity;In addition,the existence of mesoporous in Ce doped Co3O4/ZSM-5 microporous sieve catalysts exerted a negative influence on its activity.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2010年第2期160-164,共5页
Journal of the Chinese Society of Rare Earths
关键词
CE
CO3O4
微孔-介孔分子筛
催化氧化
稀土
ceria
Co3O4
micro-mesoropous molecular sieve
catalytic oxidation
rare earths
