【摘要】：以丁二酸/癸二酸、氯化膽堿與四乙基溴化銨復(fù)配形成的低共熔體作為溶劑和模板劑,采用微波-離子熱法合成了SAPO-5分子篩。考察了晶化溫度、前驅(qū)物的種類及低共熔混合物的種類對多級孔SAPO-5分子篩形貌的影響。采用XRD、SEM、N_2物理吸脫附對合成產(chǎn)物的結(jié)構(gòu)、形貌和孔結(jié)構(gòu)進(jìn)行了表征。SEM結(jié)果表明,鋁源為異丙醇鋁時,其樣品為六棱柱晶體和納米粒子團(tuán)聚物,鋁源為堿式乙酸鋁時,樣品為具有不同長寬比的柱狀晶體。N_2物理吸脫附表明,癸二酸部分替換丁二酸在無氫氟酸條件下合成的樣品F1,介孔體積較大,為0.297cm~3/g。SEM、N_2物理吸脫附分析表明,該分子篩是一種同時含有微孔和介孔結(jié)構(gòu)的磷酸鋁分子篩。將3種具有不同孔結(jié)構(gòu)的催化劑用于苯與芐醇的烷基化反應(yīng)中,F1表現(xiàn)出較高的催化活性,芐醇的轉(zhuǎn)化率達(dá)到91%。
[Abstract]:SAPO-5 molecular sieves were synthesized by microwave-ion thermal method using eutectic melt formed by the combination of succinic acid / sebacic acid, choline chloride and tetraethyl ammonium bromide as solvent and template. The effects of crystallization temperature, precursor types and eutectic mixtures on the morphology of multiporous SAPO-5 molecular sieves were investigated. The structure, morphology and pore structure of the synthesized product were characterized by XRD,SEM,N_2 physical adsorption and desorption. The results showed that when the aluminum source was aluminum isopropanol, the sample was hexagonal crystal and nanoparticles, and when the aluminum source was basic aluminum acetate, the sample was columnar crystal with different aspect ratio. The physical adsorption and desorption of N _ 2 showed that sebacic acid partially replaced succinic acid in the absence of hydrofluoric acid. The mesoporous volume is 0.297cm 鈮，

本文編號：2500107