32results about How to "High toluene conversion" patented technology

The present invention discloses an EU-1/ZSM-5 composite molecular sieve and a toluene disproportionation and transalkylation catalyst and application of the catalyst. In the EU-1/ZSM-5 composite molecular sieve, a ZSM-5 molecular sieve is embedded around a EU-1 molecular sieve, the EU-1 molecular sieve accounts for 30% to 70% weight percent of the composite molecular sieve, and the molar ratio of silica/alumina is 30 to 50. The toluene disproportionation and transfer catalyst includes the composite molecular sieve. The composite molecular sieve-containing toluene disproportionation and transalkylation catalyst of the present invention has excellent performance in use without carrying metal components, and has relatively high toluene conversion rate, and benzene and xylene (B + C8A) selectivity.

The invention relates to a catalyst for catalyzing direct oxidation of toluene to prepare benzaldehyde and a preparation method thereof. The catalyst comprises the following components in percentage by weight: 85 to 90 wt% of magnesium oxide and alumina composite oxide carrier; 0.5 to 10 wt% of cerium, 0.5 to 5 wt% of cobalt, 0.1 to 5 wt% of copper, and 0.5 to 2 wt% of nickel, wherein the mole ratio of magnesium oxide to alumina is 1-2. The catalyst takes a mixture of magnesium oxide and alumina as the carrier, can directly catalyze the oxidation of toluene to prepare benzaldehyde, and has the advantages of high toluene conversion rate, high benzaldehyde selectivity, high reaction stability, excellent performance, and mild reaction conditions. Moreover, the reaction product and the reactants are in two phases, and thus separation and purification become easier.

The invention provides a toluene and methanol and/or dimethyl ether alkylation reaction catalyst and a preparation method thereof. The outer surface acid site of the catalyst is passivated through modification, and the inner surface acid site of the catalyst is retained. The preparation method of the catalyst comprises the following steps: a hydrogen-type molecular sieve with an MFI topological structure is subjected to element modification, such that the acid site is modified; the sample is dried and roasted, and is subjected to pre-absorption in saturated water vapor; the sample is then subjected to absorption in saturated ethanol vapor; the sample is impregnated in a siloxane-based agent, such that the siloxane-based agent is only absorbed on the outer surface of the molecular sieve; and drying and roasting are carried out, such that a high-activity selective catalyst is obtained. When the catalyst is applied in a toluene and methanol and/or dimethyl ether alkylation reaction, toluene conversion ate can be effectively improved, and the generation of light hydrocarbon components can be reduced.

Disclosed is a catalyst for alkylation of toluene and methanol. The catalyst includes a carrier and the following active components calculated on the basis of the carrier, by mass: 0.5-10.0% of B, and4-18% of Mg. The carrier includes, by mass, 5-90% of an EU-1 molecular sieve and 10-95% of a binder, wherein the pore volume of the EU-1 molecular sieve is 0.30-0.70 ml/g and the specific surface area is 360-500 m2/g. The catalyst is used for alkylation reactions of toluene and methanol. The catalyst is high in toluene conversion rate and has high p-xylene selectivity.

The invention discloses a catalyst for a side-chain alkylation reaction of toluene methanol, and a preparation method of styrene. The catalyst comprises: an ordered mesoporous molecular sieve catalystand a methanol oxygen-free dehydrogenation catalyst; and the ordered mesoporous molecular sieve catalyst is doped with alkali metal ions. The catalyst utilizes the better dehydrogenation performanceof the methanol oxygen-free dehydrogenation catalyst to produce a true alkylation reagent formaldehyde, and on the other hand, the alkali metal ion-modified mesoporous molecular sieve catalyst has excellent side-chain alkylation performance, the products styrene and ethylbenzene are obtained, and higher toluene conversion and styrene ethylbenzene selectivity can be obtained. The invention also provides the preparation method of styrene by using the catalyst.

The invention discloses a composite type catalyst, a preparation method of the composite type catalyst and application in methylbenzene. The composite type catalyst is prepared from alkaline molecularsieve based catalysts, alkali metal refractory salt and a boracic type catalyst; and the alkali metal refractory salt is loaded on the alkaline molecular sieve based catalysts. The composite type catalyst is used for methylbenzene and the process of preparing styrene by using methyl alcohol, and the methylbenzene percent conversion, methyl alcohol use ratio and styrene yield can be effectively improved. On the other hand, the invention further provides the preparation method and application of the composite type catalyst.