Synthesis of Novel Aluminum Gallium Dihydrogen Phosphate Metal-Inorganic Framework and Its Catalytic Preparation of Butanolal from Acetaldehyde
Here,a novel aluminum-gallium-phosphate(GAHPO)metal-inorganic framework structure was prepared by hydrothermal method,and it was fully characterized by single crystal X-ray diffraction,powder X-ray diffraction,IR spectroscopy,and gravimetric analysis-differential scanning calorimeter(TG-DSC).Single crystal X-ray diffraction results show that GAHPO is attributed to the trigonal system and Rc3 space group.Al(Ga)O6 octahedra and PO4 tetrahedral structures is distorted to form one-dimensional chains,and then is stacked into three-dimensional metal-inorganic frameworks through hydrogen bonding.TG-DSC shows that GAHPO is of high thermal stability,with the initial decomposition temperature of 240 ℃.Compared with aluminum phosphate,the introduction of Ga3+distorted the AlPO4 lattice,thus weakening and elongating the Al—O bond,which makes more acid catalytic sites exposed and enhanced the catalytic activity.The experiment shows that when the reaction temperature is 60 ℃,and the catalyst dosage is 10％of acetaldehyde,GAHPO could catalyze the condensation of acetaldehyde to produce butanolal with good conversion rate(47％)and excellent selectivity(＞99％).The reaction mechanism of acetaldehyde condensation catalyzed by GAHPO was investigated using scavengers,NH3-TPD and specially designed derivatives to confirm the reactive sites of the catalyst and the substrate.This work provides a feasible way for novel aluminum inorganic framework structures and the catalytic applications.
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