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Wear-resistant and thermally stable alumina coating carrier

A technology of alumina coating and thermal stability, which is applied in the direction of catalyst carrier, metal/metal oxide/metal hydroxide catalyst, inorganic chemistry, etc. The overall cracking of the layer and other problems can be achieved, and the effects of good hydrothermal stability, increased wear resistance, and reduced shrinkage and deformation can be achieved.

Inactive Publication Date: 2011-09-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the long-term action of high temperature and airflow containing water vapor on the coating carrier, the coating is severely eroded and worn, and even the overall cracking and peeling of the coating occur, resulting in the loss of active components of the surface catalyst, thus affecting the performance and service life of the catalyst.

Method used

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  • Wear-resistant and thermally stable alumina coating carrier
  • Wear-resistant and thermally stable alumina coating carrier
  • Wear-resistant and thermally stable alumina coating carrier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Dissolve pseudo-boehmite in water to make a 15% alumina sol. 40 grams of the above alumina sol, 0.3 grams of samarium oxide, 4 grams of wollastonite, and 60 grams of 2% PVA solution. Then add 60 grams of gamma-alumina powder (specific surface area 230 meters 2 / gram). After stirring for about ten minutes, the slurry was ball milled at room temperature so that the particle size was controlled below 5 microns. The slurry was sprayed onto cordierite pellets with a particle size of 4 mm, and the coating loading was controlled by controlling the spraying time. After spraying, dry at 80°C for 2 hours, then raise the temperature to 120°C and dry again for 2 hours, and finally bake at 800°C for 10 hours to obtain a layered composite carrier A. The physical and chemical properties are shown in Table 1.

Embodiment 2

[0027] 40 grams of 20% alumina sol, 0.5 grams of yttrium oxide, 0.5 grams of thulium oxide, 2.0 grams of diopside, 60 grams of 3% hydroxypropyl cellulose solution, 40 grams of ultrafine θ-Al 2 o 3 (Specific surface area 180 meters 2 / gram) powder, be prepared into slurry according to the mode described in embodiment 1, control slurry granularity below 5 microns. The slurry was sprayed onto mullite pellets with a particle size of 4 mm, dried again at 150°C for 2 hours, and finally calcined at 1000°C for 4 hours to obtain a layered composite carrier B. The physical and chemical properties are shown in Table 1.

Embodiment 3

[0029] 36 grams of alumina sol (containing 25% by mass of alumina), 0.8 grams of niobium oxide, 60 grams of 4% CMC solution, 5 grams of magnesium aluminate, 2.5 grams of calcium silicate, 0.5 grams of clay, 50 grams of -Al 2 o 3 powder (specific surface area 160 m 2 / gram), the slurry is obtained in the manner described in Example 1, and the slurry particle size is controlled below 5 microns. Slurry spraying onto δ-Al with a particle size of 4 mm 2 o 3 dry at 80°C for 6 hours, and finally bake at 950°C for 6 hours to obtain a layered composite carrier C, whose physical and chemical properties are shown in Table 1.

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Abstract

The invention relates to a wear-resistant and thermally stable alumina coating carrier, which mainly solves the technical problem that an alumina coating is severely worn and even cracked and stripped under the action of a high temperature and water-vapor-containing air flow for a long time in the prior art. The alumina coating of the wear-resistant and thermally stable alumina coating carrier comprises at least one of gamma-Al2O3, delta-Al2O3 and theta-Al2O3 serving as a main body, at least one of samarium, thulium, yttrium, niobium, thorium, lanthanum, cerium and the like serving as a stabilizer, and at least one of calcium silicate, magnesium aluminate, zirconium aluminate, wollastonite, diopside, perlite and clay serving as an auxiliary agent, and a kernel is at least one carrier of alumina, silica, cordierite, spinel, sillimanite, andalusite and kyanite. Through the technical scheme, the problem is well solved, and the invention can be used for the industrial production of preparing the wear-resistant and thermally stable alumina coating carrier.

Description

technical field [0001] The present invention relates to an abrasion resistant, thermally stable alumina coated support. Background technique [0002] Supported catalysts with noble metals as active components are widely used in chemical and oil refining processes. However, due to the high price of noble metals, it is necessary to reduce their content as much as possible while maintaining performance. The study found that for some internal diffusion rate << intrinsic reaction rate, because the reaction rate is very fast, the reactant molecules reacted as soon as they diffused into the pores, and the diffusion rate could not keep up, so that the central part of the catalyst The inner surface of the carrier has not been utilized. For this type of reaction, when the active components are concentrated on the surface of the carrier surface, the selectivity of intermediate products in series reactions can be improved or the selectivity of rapid reactions can be improved. In a...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J37/02B01J23/10B01J23/20B01J23/63C07C15/46C07C5/48C01B5/00
Inventor 马春景李应成缪长喜卢立义
Owner CHINA PETROLEUM & CHEM CORP
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