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

The invention discloses a methanol aromatization process. The steps are: 1) Methanol enters the tube side of the reactor to contact with the tube side catalyst, the operating temperature is 400-450°C, the operating pressure is 0.1-5Mpa, and the liquid space velocity of the raw material methanol is 0.5-7.0h -1 ; 2) The reaction product from the tube side enters the shell side of the reactor to contact with the catalyst on the shell side, the operating temperature is 330-380°C, the operating pressure is 0.1-3.5Mpa, and the operating space velocity is 0.4-4.0h -1 , converted to C through shell-side catalysis 5 + Hydrocarbon liquid products are separated by rectification to obtain aromatics and non-aromatics. After the gas products in the shell side products are separated, the low carbon olefins return to the shell side of the reactor to continue the reaction. The use of the invention can improve the utilization rate of methanol, simplify complex reactions, increase the selectivity of low-carbon olefins, and reduce the generation of dry gas and liquefied gas.

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 discloses a preparation method of a shape-selective catalyst for synthesizing p-methyl phenol, relating to the technical field of high performance catalyst in alkylating process. The preparation method comprises the following steps of: weighing metal nitrate, and adding the same in anhydrous alcohol, wherein the mass ratio of the metal nitrate to the anhydrous alcohol is 1:10; adding a complex ligand after the metal nitrate is completely dissolved, wherein the mol ratio of the complex ligand to the metal ions in the metal nitrate is 1:1 to 3:1, uniformly stirring the mixture through a glass bar, adding a micro-porous molecular sieve therein, adjusting the mass ratio of the metal ions in the metal nitrate to the micro-porous molecular sieve to 1:100 to 1:5, uniformly stirring, soaking at the room temperature for 24 h, and drying the mixture at water bath of 60 DEG C, transferring the mixture in an oven, and drying the same at 120 DEG C for 6 h, roasting the mixture in a muffle furnace, and heating up to 550 DEG C at a speed of 10 DEG C per minute to obtain the shape-selective catalyst. The invention has the advantages of simple preparation method, low cost and high shape selection performance, etc.

The invention relates to a preparation method of a P2O5 modified micro-porous molecular sieve shape-selective catalyst. The method adopts micro-porous molecular sieve ZSM-5 or MCM-22 as a matrix and phosphate as a precursor, P2O5 is loaded on the external surface of the micro-porous molecular sieve through a dipping and programmed heating roasting process, and the content of P2O5 in the shape-selective catalyst is 1-15% of the total mass of the catalyst. The shape-selective catalyst obtained in the invention has a very good shape-selective catalysis effect on a toluene disproportionation process, and the preparation method of the catalyst is simple.

The invention relates to a preparation method of an oxide-modified microporous molecular sieve shape-selective catalyst. In the method, the original powder of the microporous molecular sieve from which the template agent has been removed is used as a carrier, and metal nitrate is used as a precursor, and the metal oxide is supported by an impregnation method on the outer surface of the microporous molecular sieve. The shape-selective catalyst obtained in the invention has good shape-selective catalytic performance in the process of synthesizing p-xylene by alkylation of toluene and dimethyl carbonate.

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 relates to a method for preparing a shape-selective catalyst. According to the method, a microhole molecular sieve ZSM-5 or MCM-22 is taken as a matrix; melamine is used as a precursor; carbon nitride (C3N4) is loaded on the outer surface of the microhole molecular sieve through immersing and calcining; during immersing, dimethyl sulfoxide (DMSO) is used as a solvent; and the mass ratio of melamine to the microhole molecular sieve is 1:1-1:5. The method has the advantages of simplicity, low cost, high shape-selective performance and the like; the acid site on the outer surface of the molecular sieve can be completely covered; and therefore, the shape-selective performance of the microhole molecular sieve is improved.

The invention relates to a preparation method of a graphene oxide modified shape-selective catalyst with microporous molecular sieves. According to the method, the microporous molecular sieves MCM-22and ZSM-5 serve as matrixes, and graphene oxide is dispersed in the outer surfaces of the microporous molecular sieves according to a liquid-phase ultrasonic dispersion method. The obtained shape-selective catalyst has good shape-selective catalytic performance for the process of synthesizing p-toluene by toluene disproportionation.

The invention relates to a preparation method of a tungsten oxide-modified microporous molecular sieve shape-selective catalyst. The method uses microporous molecular sieve ZSM-5 or MCM-22 as a carrier, and uses ammonium tungstate as a precursor of tungsten oxide to oxidize the tungsten oxide by an impregnation method. Tungsten is supported on the outer surface of the microporous molecular sieve, and the content of tungsten oxide in the catalyst is 3% to 15% of the total mass of the catalyst. The catalyst obtained by the invention has good shape-selective catalytic performance for the disproportionation process of ethylbenzene, and the preparation method of the catalyst is simple.

The invention relates to a preparation method of a melem modified micro-porous molecular sieve shape-selective catalyst. According to the method, a micro-porous molecular sieve MCM-22 and a ZSM-5 serve as substrates, and melem is dispersed on the outer surface of the micro-porous molecular sieve by a liquid-phase ultrasonic dispersion method. The prepared shape-selective catalyst has excellent shape-selective catalytic performance in p-xylene synthesis process by toluene disproportionation.

The invention relates to a preparation method of a titanium oxide modified microporous molecular sieve shape-selective catalyst. According to the method, a microporous molecular sieve ZSM-5 or MCM-22 is taken as a matrix, tetrabutyl titanate is taken as a precursor, absolute ethyl alcohol is taken as a solvent, titanium oxide is supported to the outer surface of the microporous molecular sieve through equivalent-volume impregnation and water-vapor treatment, and titanium oxide in the catalyst accounts for 3%-10% of the total mass of the catalyst. The shape-selective catalyst obtained with the method has good shape-selective catalysis performance on a process of synthesizing p-xylene through alkylation of toluene and dimethyl carbonate.

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.

The invention relates to a method for preparing a phosphorus oxide modified microporous molecular sieve shape-selective catalyst. by the method, a microporous molecular sieve ZSM-5 or MCM-22 is used as a matrix, pyrophosphorous acid, hypophosphoric acid, iso-hypophosphoric acid, pyrophosphoric acid, triphosphoric acid or peroxydiphosphoric acid is used as the precursor of a phosphorus oxide, and the phosphorus oxide is loaded on the outer surface of the microporous molecular sieve in an impregnation and temperature programmed calcination method, wherein the mass ratio of the phosphorus oxide to the microporous molecular sieve is (1:6) to (1:20). The obtained shape-selective catalyst provided by the invention has good shape-selection catalytic performance on toluene disproportionation and ethylbenzene disproportionation processes, and the preparation method of the catalyst is simple.