摘要
采用一步晶化法合成了具有MCM-41介孔分子筛结构的CoAPSO分子筛.用X射线粉末衍射(XRD)、元素分析(ICP)、氮气吸附、透射电镜(TEM)、紫外可见漫反射光谱(UV-V is)和热重分析(TG)等对样品进行了表征.合成的样品热稳定性高,孔径大约在2.5 nm左右.钴原子以四配位形式进入介孔孔壁中;随着钴含量增加,样品的孔径减小,孔壁增厚.在环己烷氧化反应中,所合成的CoAPSO分子筛显示出较高的催化活性和环己酮选择性;当钴含量为0.34%时,单位钴原子上环己烷的转化数达到420.5.
Mesoporous molecular zation and characterized by XRD, sieve CoAPSO with MCM-41 structure TEM, ICP element analysis, nitrogen was synthesized through one-step crystalli- sorption, UV-Vis spectra and thermogravimetric （TG） analysis. The results suggested that the heteroatom cobalt was incorporated into the pore wall of MCM- 41. CoAPSO as-prepared exhibited high thermal stability and a pore dimension of 2.5 nm. With the increase of Co content in CoAPSO, its pore size decreased and the wall thickness increased. The material CoAPSO as a catalyst exhibited high activity and cyclohexanone selectivity in cyclohexane oxidation under mild conditions with molecular oxygen as oxidant; the turnover number （TON） reached 420.5 for CoAPSO with a cobah content of 0.34%.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2009年第3期228-232,共5页
Journal of Molecular Catalysis(China)
基金
国家自然科学基金(20603044)
国家重点基础研究发展计划(973计划
2006CB202504)
中国科学院方向项目(KJCX2.YW.H16)
关键词
介孔分子筛
CoAPSO
合成
催化表征
环己烷氧化
Mesoporous molecular sieves
CoAPSO
Synthesis
Characterization
Cyclohexane oxidation
