Preparation Of Shaped Titanosilicate Catalysts And Their Performance In Liquia-Phase Oxidation Reactions

Phenol and benzodiazepines are important fine organic chemical raw materials. Direct synthesis of phenol via one-step hydroxylation of aromatic hydrocarbon is not yet realized. Actually, the production of phenol in industry is based on multistep reaction process[1].The discovery of TS-1 zeolite has opened a new route[1][2]to preparation of phenolic compounds by aromatic hydroxylation.Methyl ethyl ketone oxime and acetaldehyde oxime are important raw chemical materials in the process of chemical production. Cyclohexanone oxime is an important intermediate for the production of caprolactam via Beckmann rearrangement, a basic raw material of nylon 6 and engineering plastics and with an annual demand of about 7 million tons. Through the application of spray technology, we prepared the microsphere Ti-MOR zeolite, then investigated its performance in cyclohexanone oximation under the same reaction conditions by comparing to the powder Ti-MOR catalyst, which has made a great realistic significance.Polypropylene, acrylonitrile and epoxy propane are three propylene derivatives. Epoxy propane is also a important organic material in chemistry. Down-stream products of PO include polyether polyols, nonionic surfactants,ects. Polyether polyols are used widely, e.g. as the raw materials of polyurethane foam, adhesives and coating in the daily life. Ti-MWW with a unique channel structure has displayed different solvent effect, catalytic activity and product selectivity from TS-1 in catalytic epoxidation of olefin.This thesis has carrried out the preparation of shaped titanosilicate catalysts through using different kinds of methods and studied their performance in liquia-phase oxidation reactions. Firstly we use the spraying and recrystallization techniques to obtain different batches of microsphere molecular sieve, then carried out the ammoximation of cyclohexanone to oxime over Ti-MOR catalyst. Secondly we improved the performance of TS-1 by piperidine-assisted post treatments as piperidine could serve as a templating agent for the MFI structure and exhibit certain protection function at the same time, which controlled the desilication degree. After optimizing the postsynthesis condition of TS-1 microspheres, we obtained more active oximation catalyst. Finally we used the extrusion molding to produce Ti-MWW catalyst, giving rise to ideal catalyst after piperidine modification. Through choosing right mole ratio, mass percentage of hydrogen peroxide in the mixed solution, feed speeding, temperature etc., we carried out the effects of shaping and modification on the perfromace of Ti-MWW catalyst in propylene epoxidation.