文献类型：期刊文献

英文题名：Support effects of Cs/Al2O3 catalyzed aldol condensation of methyl acetate with formaldehyde

作者：Ma, Hongqin[1];Guan, Yanan[1];Chen, Wenyao[1];Sui, Zhijun[1];Qian, Gang[1];Chen, De[2];Zhou, Xinggui[1];Duan, Xuezhi[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Norwegian Univ Sci & Technol, Dept Chem Engn, N-7491 Trondheim, Norway

年份：2021

卷号：365

起止页码：310

外文期刊名：CATALYSIS TODAY

收录：;EI(收录号：20202408833257);WOS:【SCI-EXPANDED(收录号:WOS:000637755300006)】；

基金：This work was financially supported by the Natural Science Foundation of China (21922803 and 21776077), the Shanghai Natural Science Foundation (17ZR1407300 and 17ZR1407500), the China Postdoctoral Science Foundation (BX20190116), the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, the Shanghai Rising-Star Program (17QA1401200), the State Key Laboratory of Organic-Inorganic Composites (oic201801007) and the Open Project of State Key Laboratory of Chemical Engineering (SKLChe-15C03).

语种：英文

外文关键词：Support effects; Cs/Al2O3 catalysts; Methyl acrylate; Aldol condensation; Acid-base synergy

摘要：In this work, the support effects on vapor-phase aldol condensation of methyl acetate (MeOAc) with formaldehyde (HCHO) over cesium catalysts are understood by the employment of Al2O3 with different morphologies and crystal phases. The structural and electronic properties of these supported Cs catalysts are characterized by multiple techniques, such as XRD, HAADF-STEM, EDS-mapping, XPS, NH3-TPD and CO2-TPD. The Cs species are found to be highly dispersed on the Al2O3 surfaces, and their compositions vary with the identity of Al2O3. A combined catalyst characterization and testing results indicates a balance between acidic and basic sites, i.e., an acid-base synergy, for the production of MA: the excess acidic sites lead to the lower MA selectivity due to the promoted further condensation, while the excess basic sites with the lower MeOAc conversion due to the insufficient activated HCHO species. These insights could be valuable for the design and optimization of catalysts for this reaction.