63results about How to "Pore ​​structure is suitable" patented technology

The invention provides a preparation method of Ni-SiO2 / Al2O3 catalyst, which comprises the steps of: introducing auxiliaries into an alumina carrier; heating the carrier; preparing nickel salt containing urea; impregnating the solution onto the heated carrier in a manner of isometric impregnation; placing the impregnated sample in a sealed container for in-situ reaction at the temperature higher than 90 DEG C; and carrying out drying, roasting, reducing and passivating to obtain the catalyst product which contains 5 to 25% of nickel by mass fraction and 0.5 to 7% of silicon auxiliary by mass fraction and which includes the double functions of hydrolysis and hydrogenation. The catalyst is used for the secondary hydrogenation process for the preparation of 1, 4-butanediol from hydrogenated 1,4-butynediol by a two-step method, thereby accomplishing the hydrolyzed and hydrogenated conversion of chromophore cyclic acetal, reducing the chromaticity of 1,4-butanediol products and improving the product quality.

The invention relates to a preparation method of a nickel phosphide catalyst carried by a composite carrier. The method is characterized by comprising the following steps: firstly, using activated alumina and relative enzymes and alcohols as raw materials to prepare a composite carrier of TiO2-Al2O3 by adopting an improved sol-gel method; further, selecting suitable nickel salt and phosphate and carrying out ultrasound dipping and drying in microwaves to obtain a catalyst precursor; and finally, increasing a temperature by a program and reducing to obtain the composite support. The composite carrier of TiO2-Al2O3 prepared by the invention not only can effectively overcome the defect that nickel phosphide is apt to react with gamma-Al2O3 to generate AlP4 to lose the activity, but also overcomes the defect that a specific surface area of single TiO2 is relatively small, effectively exerts the strong metal-support interaction (SMSI) of the TiO2, thereby obtaining a hydrodesulfurization catalyst with remarkable activity efficacy.

The invention provides a method for preparing a butanediol secondary hydrogenation catalyst through adopting the butynediol two-step hydrotreation, and the method comprises the following steps: an accelerant is introduced into an alumina carrier; the carrier is heated; mixed nickel complex solution containing organic nickel salt, inorganic nickel salt and surfactant is prepared; the mixed nickel salt solution is dipped on the heated carrier, and the catalyst product with the nickel content of 5-25 w% and the accelerant content of 0.001-6 w% can be obtained by drying, baking, deoxidizing and passivating. The catalyst can be used in the process of preparing the butanediol secondary hydrogenation by adopting the butynediol two-step hydrotreation, the carbonyl can be reduced to be lower than 0.2 mg (KOH)*g<-1>, and the contents of acetal and butylene glycol are enabled to be reduced to the lowest level. Through the subsequent rectification, the butylene glycol product with the purity morethan or equal to 99.5 percent and the chromaticity lower than or equal to 10 AHPA can be produced.