Preparation Of α-Al₂O₃ Support And The Application In CO Coupling Reaction

In this paper,choosing industryγ-Al₂O₃ as raw materials,the author preparedα-Al₂O₃ by calcination and study the rules of Al₂O₃ crystalline transformation under the action of mineralization agent.Various Pd/α-Al₂O₃ catalysts were impregnated under various precursor concentration solutions and various temperatures.In addition,ultrasonic and vacuum impregnation methods were introduced to the catalysts preparation.And then,Pd/α-Al₂O₃ catalysts were tested in gradient-less reactor under the optimized condition which was being testified.The kinetics formulation was derived from the mechanism of CO coupling reaction on Pd/α-Al₂O₃ catalysts and the parameters of kinetic were confirmed by simulation via MATLAB based on the experimental data.The mineralization agent NH₄F reduced the calcination temperature in the process of aluminum oxide crystal transformation due to the generation of intermediate products AlOF.The percentage ofαphase in the aluminum calcined under 1050℃is more than 99%.Theα-Al₂O₃ products possess the tabular crystal grain and the concentrated distribution of particle pore diameters（average diameter is 2066nm）.The active component particle size and dispersion degree of Pd/α-Al₂O₃ catalysts was influenced by the impregnation conditions（heating,ultrasonic,vacuum）.We optimized the reaction condition of coupling reaction in the gradient-less reactor.And then,we tested the performance of Pd/α-Al₂O₃ catalysts prepared under various methods under the optimal condition and analyzed the rules between active agent loading and catalyst performance.The kinetics formulation was derived from each elementary reaction which was divided from the CO coupling reaction base on the reaction mechanism.The final kinetics formulation and parameters was calculated by stimulation via MATLAB base on the data source of CO coupling reaction experiment.Stimulate the CO coupling reaction situation in the single tube fixed-bed reactor via FLUENT,which will benefit the industrial application and the design of the fixed-bed reactor.