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Catalyst, and preparation method and application thereof

A technology of catalysts and additives, applied in the field of ammonia decomposition, can solve the problems of low catalytic activity at low temperature and poor effect of ammonia decomposition, and achieve the effect of enhancing interaction, improving ammonia decomposition effect, and improving dispersion

Active Publication Date: 2019-09-24
福大紫金氢能科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved in the present invention is to overcome the low-temperature catalytic activity of the ammonia decomposition catalyst in the prior art, and the defects of the poor ammonia decomposition effect, thereby providing a catalyst with high low-temperature catalytic activity and good ammonia decomposition effect. Its preparation method and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This embodiment provides a catalyst, including 0.8 g of nickel as an active component, 1.2 g of cerium oxide as an auxiliary agent, and 8 g of potassium titanate as a carrier.

[0039] The present embodiment provides the preparation method of above-mentioned catalyst, comprise,

[0040] S1. Disperse P25 titanium dioxide in an aqueous potassium hydroxide solution with a concentration of 5 mol / L, and the ratio of potassium hydroxide to titanium dioxide is 5:1 to obtain a suspension.

[0041] S2. The suspension was subjected to a hydrothermal reaction at 120° C. for 36 hours, and the hydrothermal reaction product was calcined at 500° C. for 12 hours to obtain a potassium titanate carrier.

[0042] S3. Dissolving 2.48g of nickel nitrate and 2.27g of cerium nitrate in water to obtain a metal salt mixed solution, wherein the concentration of metal ions is 1mol / L.

[0043] S4. Ultrasonic disperse 8 g of potassium titanate carrier in deionized water, and heat to 50° C. to obta...

Embodiment 2

[0048] This embodiment provides a catalyst, including 1.6 g of nickel as an active component, 0.8 g of lanthanum oxide as an auxiliary agent, and 7.6 g of potassium titanate as a carrier.

[0049] The present embodiment provides the preparation method of above-mentioned catalyst, comprise,

[0050] S1. Disperse P25 titanium dioxide in an aqueous potassium hydroxide solution with a concentration of 7 mol / L, and the ratio of potassium hydroxide to titanium dioxide is 12:1 to obtain a suspension.

[0051] S2. The suspension was subjected to a hydrothermal reaction at 150° C. for 24 hours, and the hydrothermal reaction product was calcined at 650° C. for 7 hours to obtain a potassium titanate carrier.

[0052] S3. Dissolving 35g of nickel chloride and 12.0g of lanthanum chloride in water to obtain a metal salt mixed solution, wherein the concentration of metal ions is 3mol / L.

[0053] S4. Add 76g of potassium titanate carrier into the metal salt mixed solution obtained in S3 for ...

Embodiment 3

[0057] This embodiment provides a catalyst, including 2.4 g of nickel as an active component, 0.5 g of praseodymium oxide as an auxiliary agent, and 7.1 g of potassium titanate as a carrier.

[0058] The present embodiment provides the preparation method of above-mentioned catalyst, comprise,

[0059] S1. Disperse P25 titanium dioxide in an aqueous potassium hydroxide solution with a concentration of 10 mol / L, and the ratio of potassium hydroxide to titanium dioxide is 20:1 to obtain a suspension.

[0060] S2. The suspension is subjected to a hydrothermal reaction at a temperature of 190° C. for 12 hours, and the hydrothermal reaction product is calcined at a temperature of 800° C. for 3 hours to obtain a potassium titanate carrier.

[0061] S3. Dissolving 7.2 g of nickel acetate and 0.96 g of praseodymium acetate in water to obtain a metal salt mixed solution, wherein the concentration of metal ions is 3 mol / L.

[0062] S4. Add 7.1 g of potassium titanate carrier into the me...

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Abstract

The invention provides a catalyst, and a preparation method and an application thereof. The catalyst comprises an active component, a carrier and an auxiliary agent, wherein the active component is one or two selected from the group consisting of nickel and ruthenium; the carrier is potassium titanate; and the auxiliary agent is rare earth oxide. The catalyst has the following advantages: the potassium titanate is adopted as the carrier, and potassium ions are highly dispersed in the structure of titanium dioxide, so the performances of the potassium titanate used as a cocatalyst are easily and greatly improved; meanwhile, the potassium titanate has large specific surface area and facilitates dispersion of the active component, so the catalyst has high low-temperature catalytic activity and good ammonia decomposition catalytic effect.

Description

technical field [0001] The invention relates to the technical field of ammonia decomposition, in particular to a catalyst and its preparation method and application. Background technique [0002] Ammonia decomposition catalysts are mainly used in the fields of environmental protection and the preparation of hydrogen and nitrogen. In the field of environmental protection, by decomposing the ammonia-containing waste gas of the factory under the action of an ammonia decomposition catalyst, the ammonia gas is decomposed into non-toxic hydrogen and nitrogen and then recycled to reduce pollution. In the field of hydrogen production, ammonia has the advantages of being easy to liquefy, non-flammable, non-toxic at low concentrations, high hydrogen storage density, mature production, storage and transportation technology, and no carbon emissions during the hydrogen production process, making it an efficient, Clean and safe hydrogen storage carrier, which can be used for hydrogen pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J23/63B01J23/89B01D53/86B01D53/58
CPCB01D53/8634B01J23/002B01J23/63B01J23/83B01J23/894B01J2523/00B01J2523/13B01J2523/3712B01J2523/47B01J2523/3706B01J2523/3718B01J2523/3725Y02A50/20
Inventor 江莉龙倪军陈崇启罗宇
Owner 福大紫金氢能科技股份有限公司
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