Hydrolysis of aluminum isopropoxide

Using isopropanol aluminum and water as raw materials and isopropanol as medium, the relevant parameters of hydrolysis kinetics were obtained by studying the hydrolysis reaction of isopropanol aluminum. The hydrolysis process of isopropanol aluminum was analyzed using a hydrolysis kinetics model. The hydrothermal products and calcined products of isopropanol aluminum obtained under different hydrothermal conditions were characterized using IR, XRD, HRTEM and other methods, and the influence of hydrothermal conditions on the properties of the hydrothermal and calcined products was analyzed. The calcination kinetics of hydrothermal products were studied using TG-DSC and Popescu method. Through research, the following conclusions have been drawn: through the analysis of the hydrolysis process, the hydrolysis condensation reaction rate constants at 20 ℃ and 25 ℃ were obtained. The rate constant equation for hydrolysis polycondensation reaction was obtained using the obtained rate constant. The hydrolysis kinetics model was used to simulate the hydrolysis process under different raw material concentrations using computer programming. Analysis shows that the concentration and temperature of reactants during hydrolysis have a significant impact on the hydrolysis reaction rate, and have a certain impact on the lifetime formation state of the product and the termination time of the reaction. Simulating the hydrolysis process at different hydrolysis temperatures, the relationship between the reaction termination time and temperature was obtained for a solution system with a molar ratio of 13 ([Al (OR) 3]=3.568mol/L, [H2O]=10.704mol/L).

The hydrolysis of aluminum isopropoxide is related to the following factors:

(1) As the hydrolysis temperature increases, the pore size and volume of the alumina product obtained from the hydrolysis of isopropanol aluminum gradually increase, and the peak of pore size distribution shifts from 10nm to 20nm;

(2) As the concentration of the hydrolysis solution increases, the hydrolysis of isopropanol aluminum makes it easier to obtain small pore alumina, with more concentrated pore size distribution peaks; Under low concentration hydrolysis conditions, macroporous alumina is more easily obtained, and its pore size distribution peaks are not concentrated and dispersed;

(3) With the increase of the ratio of water to aluminum isopropoxide, the pore volume and pore size of the alumina product obtained from the hydrolysis of aluminum isopropoxide show a trend of first increasing and then decreasing, and the pore volume of the obtained alumina can reach up to 1 4cm · g;

(4) As the hydrolysis time increases, the hydrolysis of aluminum isopropoxide becomes more complete, and the pore size and volume of the obtained alumina gradually increase, with a pore volume up to 1 5cm · g;

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