49results about How to "Reasonable hole structure" patented technology

The invention provides a catalyst for continuously producing butanedioic anhydride by maleic anhydride hydrogenation. The catalyst is a nickel loaded catalyst prepared by an equivalent-volume impregnation method, wherein in the catalyst, the content of nickel is 13 to 20 weight percent, the content of accelerating agent is 1 to 7 weight percent, and a carrier is a composite oxide of SiO2 and Al2O3 or SiO2-Al2O3. A preparation method for the catalyst comprises the following steps: impregnating impregnation solution blended by ammonia water and active metal salt solution on a carrier subjected to baking pretreatment at a temperature between 400 and 800 DEG C by the equivalent-volume impregnation method to form the catalyst through drying, baking and reducing treatment. The catalyst is applied to continuously preparing the butanedioic anhydride by maleic anhydride hydrogenation on a fixed bed reactor, the conversion rate of maleic anhydride is more than or equal to 99.98 percent, and theselectivity of the butanedioic anhydride is more than or equal to 98.85 percent. The catalyst achieves the technical-scale continuous production of the butanedioic anhydride, and has the advantages of high activity, good selectivity, high yield (more than or equal to 98.83 percent) and long service life.

The invention discloses a preparation method of a hydrotreating catalyst composition. The method comprises the steps of subjecting a salt mixed solution A in which CO2 is dissolved to react with an alkaline solution B containing aluminium to prepare gel, when reaction is completed, controlling the pH value of pulp in a reaction tank to be 7.0-9.0, preparing a mixture of an NixWyOz composite oxide precursor and an Al2O3 precursor, pulping the mixture and MoO3 to prepare a dry body, and then forming, drying and roasting the dry body to obtain a final catalyst, wherein the salt mixed solution A contains components Ni and W. The method has the beneficial effects that the problem that bulk phase catalysts are difficult to form is solved; the physical and chemical properties of the catalyst are adjusted, and the catalyst has the advantages of larger specific surface area, uniform pore distribution and high effective utilization rate of reactive metals; and the catalyst is especially suitable for the ultra-deep desulfurization reaction for producing ultra-clean diesel.

The invention discloses a preparation method of a hydrogenation catalyst composition. The method comprises the steps of filling clear water into a reaction tank and filling CO2 into the clear water; and adding a salt mixed solution A containing components Ni and W and an alkaline solution B containing aluminium to the reaction tank in parallel to prepare gel, controlling the pH value of pulp in the reaction tank to be 7.0-9.0, preparing a mixture of an NixWyOz composite oxide precursor and an Al2O3 precursor, then beating the mixture and MoO3 to prepare a dry body, and then forming, drying and roasting the dry body to obtain a final catalyst. The method has the beneficial effects that the problem that bulk phase catalysts are difficult to form is solved; the physical and chemical properties of the catalyst are adjusted, and the catalyst has the advantages of larger specific surface area, uniform pore distribution and high effective utilization rate of reactive metals; and the catalyst is especially suitable for the ultra-deep desulfurization reaction for producing ultra-clean diesel.

The invention discloses a beta molecular sieve, a preparation method thereof and a hydrogenation catalyst containing the beta molecular sieve. The properties of the β molecular sieve are as follows: SiO 2 / Al 2 o 3 The molar ratio is 30~150, the non-framework aluminum accounts for less than 2% of the total aluminum, and the silicon atoms coordinated by the Si(0Al) structure account for more than 95% of the silicon atoms in the skeleton structure. The preparation method comprises: contacting the original powder of beta molecular sieve with normal pressure and dynamic steam, and then contacting with ammonium fluorosilicate. The β molecular sieve of the present invention is suitable as an acidic component of a diesel oil hydrogenation upgrading catalyst and a hydrocracking catalyst.

The invention relates to a method for preparing silica aerogel from straws as raw materials by virtue of low-temperature atmospheric-pressure drying. The method comprises the following steps: firstly carrying out low-temperature ashing treatment on agricultural waste straws as the raw materials, cleaning with a low-concentration hydrochloric acid solution, leaching a hydrosol by controlling the content of an alkali to prepare the hydrosol through ion-exchange treatment, directly carrying out one-step silanization treatment on the obtained hydrosol with an alkane solvent having low surface tension and high saturated vapor pressure and finally carrying out atmospheric-pressure drying to obtain the silica aerogel. The obtained silica aerogel material has excellent performance and can be used as materials in building, medicine, water treatment, industrial heat insulation, chemical engineering catalysis. The method, compared with other preparation methods of the aerogel, has the advantages of simple overall process, low cost, high specific surface area, reasonable pore structure, low apparent density, high hydrophobicity and high utilization rate of wastes and is suitable for large-scale production and applications.

The invention discloses a Fischer-Tropsch synthesis iron-based catalyst containing nickel, wherein Fe:Ni:K:Cu:SiO2 equals to 100:0.01-40:0.1-15:0.1-15:2-50. Solution containing metals of iron, nickel and copper and soda solution are carried out coprecipitation, which is adopted by the invention, after precipitation paste and solution containing silicon are carried out size mixing, serum acquired is transferred into a spray dryer for drying and molding, and then baking is carried out to obtain the catalyst. The catalyst of the invention is suitable for low temperature Fischer-Tropsch synthesisreaction and has the advantages of good activity and selectivity, high product conversion rate, mild reaction conditions, etc.; in addition, the preparation process of the invention is simple and thecatalyst prepared has better granularity and intensity, which is suitable for a process of slurry-bed Fischer-Tropsch reaction.