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

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...

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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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