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Preparation process of nickel-based supported catalyst and prepared catalyst

A technology of supported catalyst and preparation process, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc. It can solve the problem of easy agglomeration of ultrafine powder and collapse of pore structure , Poor mechanical strength of infertile oxides, etc., to achieve the effects of mass and heat transfer, high thermal stability, and low hydrogen consumption

Active Publication Date: 2012-07-04
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the problem of the bottleneck problem of solidification molding of the catalyst precursor ultrafine powder prepared by the sol-gel method, which is easy to agglomerate, the pore structure collapses, fried bars, broken bars, etc., and the mechanical strength of barren oxides is poor. The prepared catalyst has high mechanical strength and meets the needs of industrial fixed-bed reactors

Method used

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  • Preparation process of nickel-based supported catalyst and prepared catalyst
  • Preparation process of nickel-based supported catalyst and prepared catalyst
  • Preparation process of nickel-based supported catalyst and prepared catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Commercially available ethyl orthosilicate, silica sol, butyl titanate and nickel nitrate are used as raw materials. First, take 185.8 grams of ethyl orthosilicate and 51.1 grams of butyl titanate in a beaker, add deionized water and absolute ethanol, and prepare 0.22m% (based on TiO 2 -SiO 2 Calculation) TiO 2 -SiO 2 Sol A 1 , 40 ℃ ~ 70 ℃ stirring for 4 hours. Dissolve 70 grams of nickel nitrate in deionized water and absolute ethanol, stir evenly, add 80 grams of silica sol, and prepare Sol B 1 , Sol B 1 The concentration of nickel nitrate in the medium is 11m% (calculated as NiO). Sol B is then 1 Added dropwise to Sol A 1 , to obtain sol C 1 , and continued to stir at a temperature of 40° C. to 70° C. for about 3 hours to obtain a viscous green transparent wet gel with poor fluidity. After the wet gel is dried, a dry bulk catalyst precursor (chemical composition of NiO-TiO 2 -SiO 2 ternary composite oxide).

Embodiment 2～3

[0059] According to Table 2, the dosages of tetraethyl orthosilicate and silica sol were changed, and the rest of the operation steps were the same as in Example 1 to obtain different bulk precursors.

[0060]

Embodiment 4

[0069] Embodiment 4: with NiO-TiO 2 -SiO 2 Extrusion of sol as gelling agent

[0070] 100 grams of the catalyst precursor prepared by the same formula ratio and method as in Example 1 (based on the total weight of the contained oxides), ball milled to a powder of 250 to 350 meshes, and the coating 4 viscometer prepared in Example 1 measured a viscosity of 15 Sol C for ~20 sec 1 (NiO-TiO 2 -SiO 2 sol) 20 grams as a binder, powder-to-glue ratio (mass ratio) = 8: 1, the sol C 1 Add to the powder, then add 6 grams of pore structure modifier polyethylene glycol methyl ether, 1.3 grams of citric acid, knead, and extrude to obtain a cylindrical bar with a diameter of 3 mm. The formed strip-shaped catalyst precursor is dried at 25-150° C. and calcined at 550° C. for 6 hours. The strength and specific surface properties of strip-shaped catalysts (catalyst length 5 mm, 50-80 grains) and specific surface properties are measured, and the data are listed in Table 3. The determina...

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Abstract

The invention discloses a preparation process of a nickel-based supported catalyst in which one or more of silicon dioxide, titanium dioxide, alumina, zirconium dioxide and rare earth oxide are taken as carriers. The preparation process comprises the following steps of: preparing a precursor with a sol-gel method; drying the precursor; smashing the precursor into powder of 200-400 meshes; adding a bonding agent and a pore structure adjusting agent, and kneading; performing extrusion molding; baking; and pre-reducing, wherein the bonding agent is preferably commercial SB (Styrene-Butadiene) powder; and the adding amount of the bonding agent is 3-25 percent, preferably 8-15 percent of the total weight of a precursor oxide; the pore structure adjusting agent is preferably a mixture of polyethylene glycol and oxalic acid or citric acid in the molar ratio of 1:(0.8-0.1); and the adding amount of the pore structure adjusting agent is 0.1-25 percent, preferably 0.5-15 percent of the total weight of the precursor oxide. The invention further provides a nickel-based supported catalyst which is prepared with the process and has high mechanical strength and high catalytic performance. Due to the adoption of a solidification technology, the bottle neck problems of easiness in agglomerating, easiness in collapse of a pore structure, strip explosion, strip breakage and the like existing in precursor superfine powder prepared with a sol-gel method are solved.

Description

technical field [0001] The invention belongs to the field of chemical catalysts, and in particular relates to a preparation process of a nickel-based supported catalyst and a shaped catalyst prepared therefrom. Background technique [0002] Nickel-based supported catalysts use nickel (Ni) as the active component, silicon dioxide (SiO 2 ), titanium dioxide (TiO 2 ), alumina (Al 2 o 3 ) or rare earth oxide as a carrier, which has the characteristics of deep hydrogenation, high aromatics saturation activity and low price, and is widely used in the hydrofining process of petrochemical and organic chemical industries and the hydrogenation reaction process of organic products, such as in benzene hydrogenation Hydrogenation of cyclohexane, hydrogenation of raffinate to solvent oil, hydrogenation of aldehyde organic compounds to alcohol organic compounds, hydrogenation of fatty compounds and other technical fields. The preparation of nickel-based supported catalysts generally in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J23/83B01J37/00
Inventor 蔡智王军徐盛虎王忠徐燕平刘明清郑京禾李为民朱毅青罗光李晓辉
Owner CHINA PETROLEUM & CHEM CORP
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