非晶态金属-磷酸铝催化正庚醛和苯甲醛羟醛缩合制茉莉醛(英文)

作     者：A. Hamza N. Nagaraju 

作者机构：Catalysis Research Laboratory St. Joseph's College P.G. and Research Centre Bangalore 560027 India 

出 版 物：《催化学报》 (催化学报)

年 卷 期：2015年第36卷第2期

页      面：209-215页

核心收录：

学科分类：07[理学] 

基　　金：Sud-Chemie India Ltd. Cochin for support to carry out some of the instrumental analysis work 

主　　题：Amorphous aluminophosphate Metal-aluminoposphate Surface property Acid-base bi-functional catalyst Aldol condensation Jasminaldehyde 

摘      要：Amorphous aluminophosphate(AlP) and metal-aluminophosphates(MAlPs, where M = 2.5 mol%Cu, Zn, Cr, Fe, Ce, or Zr) were prepared by coprecipitation method. Their surface properties and catalytic activity for the synthesis of jasminaldehyde through the aldol condensation of nheptanal and benzaldehyde were investigated. The nitrogen adsorption-desorption isotherms showed that the microporosity exhibited by the aluminophosphate was changed to a mesoporous and macroporous structure which depended on the metal incorporated, with a concomitant change in the surface area. Temperature-programmed desorption of NHand COrevealed that the materials possessed both acidic and basic sites. The acidic strength of the material was either increased or decreased depending on the nature of the metal. The basicity was increased compared to AlP. All the materials were X-ray amorphous and powder X-ray diffraction studies indicated the absence of metal oxide phases. The Fourier transform infrared analysis confirmed the presence of phosphate groups and also the absence of any M-O moieties in the materials. The selected organic reaction occurred only in the presence of the AlP and MAlPs. The selectivity for the jasminaldehyde product was up to 75% with a yield of 65%. The best conversion of nheptanal with a high selectivity to jasminaldehyde was obtained with FeAlP as the catalyst, and this material was characterized to have less weak acid sites and more basic sites.