CTAB-P123辅助制备有序介孔KF/Al-Ce-SBA-15固体碱及其催化性能

doi:10.11944/j.issn.1000-0518.2019.11.190081

摘要/Abstract

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。

关键词: 十六烷基三甲基溴化胺, 三嵌段表面活性剂P123, 介孔固体碱, SBA-15, Al-Ce复合物

Abstract:

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.

Key words: cetyltrimethylammonium bromide, triblock copolymer P123, mesoporous solid bases, SBA-15, Al-Ce mixed oxides

刘宁,刘水林,伍素云,唐新德,吴智,李爱阳. CTAB-P123辅助制备有序介孔KF/Al-Ce-SBA-15固体碱及其催化性能[J]. 应用化学, 2019, 36(11): 1294-1300.

LIU Ning,LIU Shuilin,WU Suyun,TANG Xinde,WU Zhi,LI Aiyang. CTAB-P123-Assisted Synthesis of Orderly Mesoporous KF/Al-Ce-SBA-15 Solid Base and Its Catalytic Application[J]. Chinese Journal of Applied Chemistry, 2019, 36(11): 1294-1300.

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