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Spraying preparation method of layered composite oxide carrier

An oxide carrier and layered composite technology, which is applied in the direction of catalyst carriers, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problem that spraying and drying cannot be carried out simultaneously, uniformly and continuously, and coating spraying and drying are not uniform , low production efficiency and other issues, to achieve the effect of shortening the spraying time, ensuring surface integrity and high spraying efficiency

Active Publication Date: 2013-01-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that in the prior art, spraying and drying cannot be carried out simultaneously, uniformly and continuously, and coating spraying and drying are not uniform, resulting in the shortcomings of poor coating quality and low production efficiency. A new layer Spray coating preparation method of shape composite oxide carrier

Method used

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  • Spraying preparation method of layered composite oxide carrier
  • Spraying preparation method of layered composite oxide carrier
  • Spraying preparation method of layered composite oxide carrier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Mix 4,300 grams of alumina sol with a concentration of 15%, 1,200 grams of 10% polyvinyl alcohol solution, and 4,500 grams of deionized water to make a slurry, add 3,500 grams of alumina powder with a strength below 20 microns, and add 40 grams of silicic acid Calcium and 50 grams of magnesium oxide, adjust the pH value at about 4.2, stir at high speed for 30 minutes, and ball mill at room temperature for 2 hours to obtain a slurry with a particle size controlled below 10 microns. The slurry is sprayed onto cordierite pellets with a diameter of 4mm. The frequency of the carrier air fan for conveying the carrier is 30Hz, the temperature is 120°C, there are 2 spray guns, the diameter is 0.8mm, the atomization pressure is 5Bar, and the weight gain of the carrier is controlled by the total amount of feed. 12%. The coated spherical carrier was dried at 120°C for 3 hours, and then calcined at 1000°C for 8 hours to obtain carrier S1. The test results of the physical and chemic...

Embodiment 2

[0022] Mix 4000 grams of alumina sol with a concentration of 15%, 2000 grams of 8% polyvinyl alcohol solution, and 3500 grams of deionized water to make a slurry, add 3000 grams of alumina powder with a strength below 20 microns, and add 60 grams of silicic acid Calcium, adjust the pH value to about 4.2, stir at high speed for 30 minutes, and ball mill at room temperature for 2 hours to obtain a slurry with a particle size controlled below 10 microns. The slurry is sprayed onto alumina pellets with a diameter of 3mm. The frequency of the carrier air fan for conveying the carrier is 20Hz, the temperature is 70°C, there are 3 spray guns, the diameter is 0.5mm, and the atomization pressure is 3Bar. The weight gain of the carrier is controlled by the total amount of feed. 12%. The coated spherical carrier was dried at 150°C for 2 hours, and then baked at 800°C for 12 hours to obtain the coated carrier S2. The physical and chemical properties of the coated carrier are listed in Tab...

Embodiment 3

[0024] Mix 5,000 grams of alumina sol with a concentration of 10%, 1,000 grams of 10% HPC solution, and 3,500 grams of deionized water to make a slurry, add 3,200 grams of alumina powder with a strength below 20 microns, and add 100 grams of magnesium oxide. The pH value is about 4.2. After stirring at high speed for 30 minutes, ball mill at room temperature for 2 hours to obtain a slurry whose particle size is controlled below 10 microns. Spray the slurry onto a pumpkin-shaped silica carrier with a diameter of 4 mm and a length of 3 to 4 mm. The frequency of the carrier air fan for conveying the carrier is 45 Hz, the temperature is 150 ° C, one spray gun, the diameter is 1.0 mm, and the atomization pressure is 8 Bar. The total control vehicle weight gain was 12%. The coated spherical carrier was dried at 100°C for 4 hours, and then fired at 1000°C for 10 hours to obtain the coated carrier S3. The physical and chemical properties of the coated carrier are listed in Table 1.

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Abstract

The invention relates to a spraying preparation method of a layered composite oxide carrier, which mainly solves the shortcomings that the spraying and drying cannot be uniformly and continuously performed at the same time, the coating spraying and drying are not uniform and consequently the coating quality and production efficiency are low. The invention solves the problems preferably by adopting a technical method which feeds the required core carrier into the inner cavity of a circular spraying device with compressed gas in a suspension manner, sprays the coating oxide slurry containing a binder on the surface of the core with a spray gun in the inner cavity to obtain a precursor I of the layered composite carrier, collects the precursor I and circularly sprays or directly dries and roasts the precursor to obtain the layered composite oxide carrier. The method can be widely applied to the industrial production for preparing the layered composite carrier in the chemical industry.

Description

technical field [0001] The invention relates to a method for preparing a layered composite oxide carrier by spraying. Background technique [0002] Layered composites have a wide range of applications in the fields of petrochemicals, environmental governance, chemical fertilizers, and medicine, mainly including layered composite oxides, non-uniformly distributed loaded noble metal catalysts, slow-release fertilizers, and drug film coatings. In the industry, a large number of layered composite coatings have been used to prepare catalysts with non-uniform distribution. For example, the patent ZL02100598.2 reported a catalyst for purifying automobile exhaust gas. The automobile tail gas purification catalyst of the invention uses a cordierite honeycomb ceramic substrate as the first carrier, and an alumina coating slurry (containing alumina and precious metals) as the second carrier. The catalyst is made by one-shot coating by dipping the first carrier in the coating slurry. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J37/02B01J32/00B01J21/16B01J21/14B01J21/12B01J23/62C07C15/46C07C5/48C01B5/00
Inventor 马春景李应成缪长喜张惠明
Owner CHINA PETROLEUM & CHEM CORP
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