STUDY ON FORMATION OF BETA ZEOLITE HONEYCOMB MONOLITHS CATALYST BY USING RESPONSE SURFACE METHOD

Abstract

Abstract: Beta zeolite is an industrial catalyst with excellent performance in practical application due to its unique 3-D 12-membered ring channel structure, which can provide more active component adsorption sites.In industrial use,the honeycomb monolith catalyst has the advantages of high flux, uniform flow field,small pressure drop and non-clogging, which is the optimal solution for gas-solid or liquid-solid catalytic reactions.However, because of the high water absorption and shrinkage of Beta zeolite, it is difficult to form honeycomb, which greatly limits the industrial application of Beta zeolite.To solve the above problems,pseudoboehite (SB powder) was selected as binder, HNO₃ as solvent, and sesbania powder as extrusion-aid, and a series of Beta zeolite honeycomb monoliths were prepared at a water-to-powder ratio of 0.6. Based on the response surface method, the effect of the ratio of each raw material on the mechanical strength of the honeycomb monoliths was evaluated.The function of the second order polynomial approximation model of the relationship between the mechanical strength of the monoliths and the three variables was obtained. The reliability of the predicted model was proved by comparing the results with the predicted values. The optimal forming conditions of Beta honeycomb monoliths were found by using the model,which were the pseudo-boehmite mass fraction of 36.1%, the nitric acid mass fraction of 8.4%, and the cyanine powdermass fraction of 4.7%.

Key words: Beta zeolite, honeycomb monoliths, response surface method

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