34results about How to "High shape selectivity" patented technology

The invention relates to a preparation method of a catalyst for a toluene disproportionation process. The method comprises the following step of grinding and roasting by taking a microporous molecular sieve ZSM-5 or MCM-22 as a carrier and taking barium nitrate, barium carbonate or barium acetate as a barium oxide precursor. By the method, the acid site of the outer surface of the microporous molecular sieve is covered without affecting the acid property in pores of the microporous molecular sieve. The catalyst obtains a relatively good shape selection effect when being used for toluene disproportionation for synthesizing the paraxylene. The preparation method of the catalyst is simple and energy-saving, and shape selection effect of the catalyst is good.

The invention relates to a method for naphthalene alkylation, which mainly solves the problems of poor catalyst selectivity and easy deactivation in the prior art. The present invention comprises the following steps: a) using silicon source, aluminum source, and organic amine template as raw materials, after hydrothermal crystallization, and then washing with deionized water, the zeolite precursor material is prepared; b) preparing The obtained zeolite precursor material is ion-exchanged and modified, and then calcined to obtain a naphthalene alkylation catalyst; c) applying the obtained naphthalene alkylation catalyst to a naphthalene alkylation reaction. Wherein, the ion-exchanged ion is selected from at least one technical solution of alkaline earth metals and lanthanide metal elements, which better solves the problem of poor selectivity of existing catalysts and can be well applied to decalin In chemical industry production.

The invention provides a catalyst for improving the para-selectivity of a phenol hydroxylation reaction product, a preparation method and an application thereof. The catalyst uses titanium-silicon molecular sieve as a catalyst, and uses silicon oxide or aluminum oxide as a binder to extrude or spray. Supplemented with iron as the first modification component, lanthanum and phosphorus as the second modification component. The catalyst is then silanized to obtain the phenol hydroxylation catalyst. Based on the weight of the catalyst, the content of iron oxide is 0.5% to 10%, the content of auxiliary agent lanthanum oxide is 0.5% to 5%, the content of auxiliary agent phosphorus oxide is 0.5% to 5%, and the content of silicon oxide is 0.5%. ~2%. Catalyst preparation adopts the equal volume impregnation method to load and introduce the active component iron, after drying and roasting, the second modified component lanthanum and phosphorus are loaded by the equal volume impregnation method, after drying and roasting again, the silanization treatment is carried out to obtain the target catalyst. The catalyst provided by the invention has high low-temperature phenol hydroxylation activity, high para-product selectivity and good catalyst stability.