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Alumina coats pulp and preparation method thereof

A technology of alumina coating and activated alumina, which is applied in chemical instruments and methods, catalyst activation/preparation, separation methods, etc., can solve the problems of short service life of thin-shell precious metal catalysts and poor stability of layered composite carriers, etc. Achieve the effects of high hydrothermal stability, excellent performance and high coating quality

Active Publication Date: 2009-07-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the technical problems to be solved by the present invention is the poor stability of the layered composite carrier and the short service life of the thin shell-shaped noble metal catalyst in the prior art. A new alumina coating slurry is provided

Method used

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  • Alumina coats pulp and preparation method thereof
  • Alumina coats pulp and preparation method thereof
  • Alumina coats pulp and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 40 grams of concentration are 10% aluminum sol, 20 grams of 2% polyvinyl alcohol, 30 grams of 1% hydroxymethyl cellulose solution, 1.2 grams of Span 80 and 0.1 milliliters of concentration are 8% nitric acid to make slurry, adjust When the pH value reaches 1.5, stir at a high speed of 2000 rpm for 30 minutes. Then add 1.5 gram of potassium feldspar, 0.8 gram of diatomaceous earth, 40 gram of gamma-alumina powder (specific surface area 230 meters) below 10 microns 2 / g), and continued to stir for 60 minutes, and then the slurry was ball milled at room temperature for 4 hours, thereby making an alumina coating slurry. Detected by laser particle size analyzer, the average particle size of the slurry is below 8 microns.

Embodiment 2

[0037] 36 grams of 5% polyethylene glycol (molecular weight is 20000), 5 grams of 2% carboxyethyl cellulose, 0.4 gram of Tween, 2 milliliters of concentration are 20% aluminum chloride, 2 grams of concentration are 40% silica sol, 30 milliliters of ammonia water with a concentration of 6%, 160 grams of alumina sol with a concentration of 30%, adjust the pH value to 6.5, stir at a high speed of 1000 rpm for 20 minutes, and then add 15 grams of θ-Al with a particle size below 15 microns 2 o 3 (Specific surface area 180 meters 2 / gram), 10 gram inorganic clays add, stir 20 minutes with 5000 rev / min high speeds. The slurry was then subjected to colloid milling at room temperature for 1 hour to produce an alumina coating slurry. Detected by laser particle size analyzer, the average particle size of the slurry is below 9.5 microns.

Embodiment 3

[0039] 35 grams of alumina sol with a concentration of 25%, 30 grams of 4% cyclodextrin solution, 10 grams of hydroxymethyl cellulose, 10 grams of hydroxypropyl cellulose solution, 1.0 grams of hexadecyl trimethyl Ammonium bromide and 1 ml of 1% hydrochloric acid were used to make a slurry, the pH value was adjusted to 4, and the mixture was stirred at a high speed of 2000 rpm for 30 minutes. Then add 0.4 grams of diatomaceous earth, 0.3 grams of potassium feldspar and 36 grams of δ-Al with a particle size of less than 1 micron to this mixed solution. 2 o 3 powder (specific surface area 160 m 2 / gram), with 2000 rpm high-speed stirring for 150 minutes, and then the slurry was colloidally milled at room temperature for 2 hours to make an alumina coating slurry. Detected by laser particle size analyzer, the average particle size of the slurry is below 8.2 microns.

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Abstract

The invention relates to alumina coat slurry and a preparation method thereof, and mainly solves the problems of the prior art of poor stability of a prepared laminar composite carrier and short service life of a prepared thin-shelled noble metal catalyst. The alumina coat slurry comprises the following components: aluminum sol with an average granularity of less than 20 micrometres, active alumina, an organic adhesive, an inorganic adhesive, a surfactant, a pH modifying agent and the balance being water, wherein the average granularity of the slurry is less than 10 micrometres. The preparation method comprises the following steps: dissolving the aluminum sol, the organic adhesive, the surfactant and the pH modifying agent in water; mixing the mixture evenly with stirring at a high speed; then adding the inorganic adhesive and active alumina powder for high-speed dispersion; and regrinding the obtained alumina coat slurry to prepare the alumina coat slurry. Thus, the preparation method better solves the problems by adopting the technical proposal, and can be used in the industrial production of laminar composite carrier.

Description

technical field [0001] The invention relates to an alumina coating slurry and a preparation method thereof. Background technique [0002] At present, a considerable part of catalysts used in chemical industry and oil refining process and automobile exhaust gas are supported catalysts using noble metals as active components. Because precious metals are expensive, their content in catalysts tends to be low. Studies have found that the non-uniform distribution of active components in the carrier can reduce the amount of precious metals and improve the utilization of precious metals; at the same time, in many reactions, catalysts with non-uniform distribution also show better activity, selectivity and life. The most important one is the eggshell catalyst, that is, the surface thin shell type in which the active components are concentrated on the surface of the carrier. [0003] Such as automobile exhaust gas purification catalyst, CN1342520 invented a kind of automobile exhau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J37/025B01J21/04B01D53/94
Inventor 李应成马春景卢立义顾国耀
Owner CHINA PETROLEUM & CHEM CORP
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