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Slurry for hydrogen oxidation catalyst coating and preparation method of slurry

An oxidation catalyst and coating technology, applied in the field of slurry for hydrogen oxidation catalyst coating and its preparation, can solve the problems of poor catalyst performance and stability, long catalyst production cycle, high coating wear rate, etc., and achieve slurry The effects of stable distribution, shortened slurry preparation time, and uniform foam size

Active Publication Date: 2013-09-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the technical problems to be solved by the present invention is that the preparation of the slurry in the prior art takes a long time, the particle size is large, and the stability of the slurry is poor, resulting in a long production cycle of the catalyst, high cost, high wear rate of the prepared coating, and poor catalyst performance. and the problem of poor stability, a new slurry for hydrogen oxidation catalyst coating is provided, which has the advantages of short slurry preparation cycle, small slurry particle size, good stability, low wear rate of the coating, and catalyst The advantages of good performance and stability

Method used

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  • Slurry for hydrogen oxidation catalyst coating and preparation method of slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Put 300 grams of water, 1200 grams of 10% aluminum sol, 800 grams of γ-alumina powder, and 8 grams of calcium silicate into the circulating colloid mill for grinding for 90 minutes, and add 20 grams of 20% aluminum chloride solution to adjust the flow of the slurry At the same time, take 10 grams of HPC, 5 grams of Span, add 300 grams of water and place them in a foaming machine to foam, add them to the above-mentioned circulating slurry, continue to add 20% aluminum chloride to adjust the pH value to ≈4.70, and continue to circulate and grind After 25 minutes, the required slurry A was obtained.

Embodiment 2

[0024] Add 500 grams of water, 1000 grams of 20% aluminum sol, 1200 grams of δ-alumina powder, 50 grams of calcium oxide, and 60 grams of magnesium aluminate into the circulating colloid mill to grind 100 grams, add 60 grams of 50% tin chloride solution to adjust Slurry fluidity, take 50 grams of PVA, 10 grams of Tween and 600 grams of water and place it in a foaming machine to foam to make a foam, add it to the above-mentioned circulating slurry, continue to add 50% tin chloride to adjust the pH value to ≈4.50, Continue to circulate and grind for 20 minutes to obtain the required slurry B.

Embodiment 3

[0026] 300 grams of water, 2000 grams of 40% aluminum sol, 300 grams of θ-alumina powder, and 30 grams of spodumene are added to the circulating colloid mill and ground for 80 degrees. Adding 40 grams of magnesium chloride solution with a concentration of 10%, the concentration of 30 grams is 20% stannous chloride solution, adjust fluidity, take 50 grams of EMC, 10 grams of polyethylene glycol and add 500 grams of water and place it in a foaming machine to foam to make foam, add it to the above-mentioned circulating slurry, and continue to increase the concentration Adjust the pH value to ≈4.3 for the 20% stannous chloride solution, and continue to circulate and grind for 30 minutes to obtain the required slurry C.

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Abstract

The invention relates to slurry for a hydrogen oxidation catalyst coating and a preparation method of the slurry, mainly solving the problems that in the prior art, the preparation of the slurry costs a long time and the slurry is large in granularity and low in stability, and thus a catalyst is long in production period and high in cost, the abrasive loss rate of the prepared coating is high, and the performance and the stability of the catalyst are low. The slurry for the hydrogen oxidation catalyst coating comprises the following components of water, aluminium sol, aluminium oxide, a coating adjuvant, a pH regulating agent and a foaming agent. The preparation method of the slurry comprises the following steps of: sequentially adding the water, the aluminium sol, the aluminium oxide and the coating adjuvant into a colloid mill, and circulating the mixture; regulating the slurry by the pH regulating agent to obtain slurry I; foaming a certain amount of the foaming agent and water by using a foaming machine; and adding foams into the slurry I to obtain slurry II. By the technical scheme, the problems are solved well; and the slurry and the preparation method thereof can be applied to the industrial production of the catalyst coating slurry.

Description

technical field [0001] The invention relates to a slurry for hydrogen oxidation catalyst coating and a preparation method thereof. Background technique [0002] At present, supported catalysts with noble metals as active components are widely used in chemical industry, oil refining and automobile exhaust treatment. The non-uniform distribution of active components in the carrier can reduce the amount of precious metals and increase the utilization rate of precious metals; at the same time, in many reactions, catalysts with non-uniform distribution also show better activity, selectivity and lifetime than catalysts with uniform distribution. In the early days, the effect of non-uniform distribution was often achieved through the control of impregnation, but it was often difficult to control the distribution range of the catalyst. This requires first providing a special carrier, which is composed of an inert core and a coating. Only the coating absorbs metal and the thickness ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00
Inventor 马春景缪长喜李应成
Owner CHINA PETROLEUM & CHEM CORP
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