Preparation And Performance Of TS-1 Zeolite Catalytic Film

Membrane reactor can combine inorganic membrane and catalytic reaction in a system, which has the advantages of separation and catalytic process. It has been regarded as one of the three development directions of the subjects on catalysis in future. Membrane reactor has attracted the attentions of worldwide researchers and will bring about a revolutionary change over chemical industry, petrochemical-industry and biochemical industry.TS-1 zeolite can meet the rigor requirement of membrane reactors because of its high thermal stability, anti-corrosive and excellent catalytic performance. Moreover, it is friendly to environment and meets the development of chemical industry. The development of TS-1 zeolite catalyst is thought as the landmark of zeolite catalysis in the 1980s.In this paper, TS-1 zeolite film was prepared by the hydrothermal synthesis, and then was assembled into the membrane reactor. Finally, the catalytic performance of TS-1 zeolite film was investigated.The TS-1 zeolite film was synthesized on theα-Al₂O₃ ceramic tube and porous muti-channel stainless steel microreactor, respectively, by secondary growth. Herein, submicron Silicalite-1 seed substitutes TS-1 zeolite seed to induce the film growth. The influencing factors of the morphology of TS-1 zeolite film were studied by changing the synthesis conditions. The as-prepared films were characterized by SEM, FT-IR and XRD etc.. The catalytic performance of ceramic-tube-supported TS-1 film was evaluated by the reaction of hydroxylation of phenol with hydrogen peroxide. And also the catalytic performance of TS-1 film on the multi-channel microreactor was investigated by the reaction of ammoximation of 2-butanone with ammonia and hydrogen peroxide.The conclusion of the research is as follows:1. The submicron Silicalite-1 seeds can induce the growth of TS-1 zeolite to form a continuous layer of film on the ceramic tube. Ti⁴⁺ can enter into the framework of TS-1 zeolite film and anatase TiO₂ in the framework is not found. The time of removing alcohol and the content of template affect the morphology of the TS-1 film. The more content of the template is contained in the solution, the smaller zeolite grain obtained is. The removal of alcohol favors incorporating of Ti⁴⁺ into the framework. 2. k has been shown that the ceramic-tube-supported TS-1 membrane reactor has high catalytic performance on the reaction of hydroxylation of phenol. The conversion of phenol reached around 8% at 80℃in water as a solvent after 4 hours of reaction time, when n(phenol)/n(H₂O₂) is 3. The film prepared by using Siliclite-1 seeds has similar catalytic performance to that by TS-1 zeolite seeds. In order to find the best reaction conditions, the influencing factors of the temperature, reaction time were investigated etc..3. The film prepared on the multi-channeI microreactor has good catalytic performance on the reaction of ammoximation of 2-butanone, too. The influencing factors of solvent and the residence time of the reaction were investigated.