摘要
为了缩短有序介孔氧化硅(SBA-15)基固体碱催化剂的工艺流程,制备长程有序介孔固体碱,本文以十六烷基三甲基溴化胺(CTAB)-三嵌段表面活性剂P123为模板剂,以KF为改性剂,两步法合成有序介孔KF/Al-Ce-SBA-15(KF/ACS)固体碱催化剂,采用小角X射线衍射(小角XRD)、N2吸附-脱附曲线、透射电子显微镜(TEM)、扫描电子显微镜(SEM)、CO2程序升温脱附(CO2-TPD)等手段,对催化剂的结构与性能进行表征,并研究了其在合成丙二醇甲醚(PM)中的催化性能。当n(Al)/n(Ce)=0.12,KF的质量分数为10%时,KF/ACS催化剂不仅能够保持长程有序介孔结构,并且显示出强碱性能。在催化甲醇与环氧丙烷(PO)合成PM的反应中,PM的收率达到92.0%,1-甲氧基-2-丙醇(PPM)选择性达到96.1%以上,并能有效抑制二丙二醇甲醚等副产物。
The orderly mesoporous KF/Al-Ce-SBA-15(KF/ACS)solid bases were successfully prepared with cetyltrimethylammonium bromide(CATB)-poly(ethylene oxide)/poly(propylene oxide)/poly(ethylene oxide)triblock copolymer(P123)as the dual-template and KF as the modifier in two steps.The structure and property of the obtained catalysts were characterized by X-ray diffraction(XRD),N2 adsorption-desorption,transmission electron microscopy(TEM),scanning electron microscopy(SEM)and CO2-temperature programmed desorption(TPD).The results illustrated that the KF/ACS catalysts possess both an ordered mesostructure and superbasicity when the introduced Al/Ce atomic ratio is 0.12 and the loading amounts(mass fraction)of KF is 10%.The catalytic activity of the prepared materials was evaluated in the ring-opening reaction of propylene oxide(PO)with methanol.It shows excellent catalytic performance exhibiting 92.0% yield of propylene glycol monomethyl ether(PM)and 96.1% selectivity to 1-methoxy-2-propanol(PPM)and the by-products of dipropylene glycol methyl ether was effectively inhibited.
作者
刘宁
刘水林
伍素云
唐新德
吴智
李爱阳
LIU Ning;LIU Shuilin;WU Suyun;TANG Xinde;WU Zhi;LI Aiyang(Department of Materials and Chemical Engineering,New Building Materials Academy,Hunan Institute of Technology,Hengyang,Hunan 421002,China)
出处
《应用化学》
CAS
CSCD
北大核心
2019年第11期1294-1300,共7页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金青年项目(51802093)
湖南省自然科学基金(2019JJ60026,2019JJ50107)
湖南省教育厅优秀青年项目(18B465)
“功能金属有机材料”湖南省普通高等学校重点实验室(GN18K01)
湖南省应用特色学科材料科学与工程学科(湘教通[2018]469号)资助~~
