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Preparation method of ultra-high temperature ammonia decomposition catalyst, ultra-high temperature ammonia decomposition catalyst prepared by the method and application thereof

A catalyst, ammonia decomposition technology, applied in separation methods, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of slow diffusion, difficult to form cubic crystal system, etc., to reduce concentration, improve dispersion, The effect of improving high temperature activity

Active Publication Date: 2022-02-22
CCTEG CHINA COAL RES INST +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the study also found that under high temperature conditions, the sintering of spinel is solid-phase sintering, which is dominated by ion diffusion. In the spinel lattice, O 2- The ion has a larger radius, and its diffusion speed is slower. In fact, only Mg with a smaller diameter participates in the diffusion. 2+ and Al 3+ , generally can only form a tight packing framework, and it is difficult to form a cubic structure

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  • Preparation method of ultra-high temperature ammonia decomposition catalyst, ultra-high temperature ammonia decomposition catalyst prepared by the method and application thereof
  • Preparation method of ultra-high temperature ammonia decomposition catalyst, ultra-high temperature ammonia decomposition catalyst prepared by the method and application thereof
  • Preparation method of ultra-high temperature ammonia decomposition catalyst, ultra-high temperature ammonia decomposition catalyst prepared by the method and application thereof

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preparation example Construction

[0042] The present invention proposes a preparation method of an ultra-high temperature ammonia decomposition catalyst, which comprises the following steps:

[0043] (1) Preparation of reconstituted materials:

[0044] Carrying out the first roasting of the powder of the hydrotalcite-like composite oxide;

[0045] Prepare the first roasted product and sodium chloride to form the first mixed liquid, pass inert gas at a certain temperature, stir, stand still, cool, wash, suction filter, and vacuum-dry to obtain the reconstituted material;

[0046] (2) Preparation of catalyst carrier particles:

[0047] Mix the reconstituted material and the basic metal oxide evenly for the second roasting;

[0048] After the second calcined product is cooled, it is uniformly mixed with the oxygen storage component, pressed into cylindrical particles with a height of 15 to 20 mm and a diameter of 10 to 20 mm, and subjected to the third calcining to obtain cylindrical catalyst carrier particles; ...

Embodiment 1

[0092] Weigh 100 g of magnesium-aluminum binary hydrotalcite-like composite oxide powder, wherein the mass percentage of magnesium oxide is greater than 75%, and calcinate the powder at 850° C. for 2 hours. Take roasted product and sodium chloride, by molar ratio n(Mg 2+ ): n(Cl - ) = 1:2 to prepare the first mixed solution, and nitrogen gas was introduced at 80°C, stirred for 30 hours, then left to cool and washed to remove Cl - , AgNO 3 Check to no Cl - , and the reconstituted material was obtained after vacuum drying.

[0093] Take 5g of high-purity fused magnesia powder and 90g of the reconstituted material prepared above, mix evenly, pre-fire at 1400-1500°C for 16h, mix evenly with 10g of oxygen storage component after cooling, and press it into a cylindrical shape with a diameter of 15mm Particles, the cylindrical particles are calcined at 1450°C for 24 hours, and the catalyst carrier is obtained after cooling. 4g of molybdenum oxide and 6g of zirconium oxide are se...

Embodiment 2

[0097] Weigh 100 g of (Mg+Zn)-Al ternary hydrotalcite-like composite oxide powder, wherein the mass percentage of magnesium oxide is greater than 60%, and calcinate the powder at 850° C. for 2 hours. Take roasted product and sodium chloride, by molar ratio n(Mg 2+ +Zn 2+ ): n(Cl - ) = 1:2 to prepare the first mixed solution, and nitrogen gas was introduced at 80°C, stirred for 30 hours, then left to cool and washed to remove Cl- , AgNO 3 Check to no Cl - , and the reconstituted material was obtained after vacuum drying.

[0098] Take 5g of high-purity fused magnesia powder and 90g of the reconstituted material prepared above, mix evenly, pre-fire at 1400-1500°C for 16h, mix evenly with 3g of oxygen storage component after cooling, and press it into a cylindrical shape with a diameter of 15mm Particles, the cylindrical particles are calcined at 1450°C for 24 hours, and the catalyst carrier is obtained after cooling. The oxygen storage component of this embodiment selects i...

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Abstract

The invention provides a preparation method of an ultrahigh temperature ammonia decomposition catalyst, the ultrahigh temperature ammonia decomposition catalyst prepared by the method and its application. The method is as follows: 50-90 parts of hydrotalcite-like composite oxide powder are first roasted; the first roasted product and sodium chloride are prepared into a first mixed solution to prepare a reconstituted material; the reconstituted material and 5- 10 parts of basic metal oxides are mixed for the second roasting, and the second roasted product is uniformly mixed with 3 to 10 parts of oxygen storage components, and pressed into cylindrical particles for the third roasting; 16 parts of nickel nitrate and / or 0-15 parts of co-solvent are impregnated until the active components are loaded to the designed amount, and then the fourth roasting is carried out to obtain an ultra-high temperature ammonia decomposition catalyst. The ultra-high temperature ammonia decomposition catalyst can solve the problems of migration and aggregation, volatilization loss and high-temperature sintering of metal particles of the catalyst active component, and has the advantages of anti-ultra-high temperature sintering, anti-high bed pressure, and high resistance to falling.

Description

technical field [0001] The present invention relates to the technical field of chemical catalysts, in particular to a preparation method of an ultra-high temperature ammonia decomposition catalyst, an ultra-high temperature ammonia decomposition catalyst prepared by the method and its application. The ultra-high temperature ammonia decomposition is especially suitable for ultra-large coke ovens Gas purification device. Background technique [0002] The single-system processing capacity of the typical Claus furnace ammonia decomposition process in China is generally 5×10 4 m 3 / h or 10×10 4 m 3 / h (corresponding to coke oven gas treatment capacity), the industrial application of this Claus furnace ammonia decomposition catalyst has been relatively mature. [0003] In order to improve the operation level of the equipment, two sets of AS purification devices can be combined into one set, and the single-system processing capacity of the combined gas treatment system is as hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89B01D53/86B01D53/58
CPCY02A50/20
Inventor 常秋连陈松清张素利唐震李培霖王永林郑秀珍颜丙峰邱全山杨华陈来夫朱乐群谷小会吴宏杰李伟林任瑞峰吴艳郑德王琦沈江红沈立嵩赵渊赵鹏胡发亭黄鹏王光耀钟金龙毛学锋马博文石智杰李军芳朱晓曼
Owner CCTEG CHINA COAL RES INST
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