Anti-arsenic poisoning denitration catalyst and preparation method thereof

By designing a sandwich composite structure SCR catalyst and using molecular sieve layers and metal modification to optimize NOx and NH3 diffusion, the problem of SCR catalyst being easily deactivated in high-arsenic flue gas is solved, and a highly efficient, arsenic-resistant and long-life denitrification effect is achieved.

CN120679598APending Publication Date: 2025-09-23DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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Patent Information

Application Number
CN202510680811.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-26
Publication Date
2025-09-23

AI Technical Summary

Technical Problem

Existing SCR catalysts are easily deactivated in high-arsenic flue gas environments, have short lifespans, and are unable to meet long-term operation requirements.

Method used

The denitrification catalyst adopts a sandwich composite structure, with the lower layer being molecular sieve A loaded with dual-component active metals, the middle layer being molecular sieve B, and the upper layer being molecular sieve C loaded with alkali metals. Through molecular sieve hierarchical design and metal synergistic modification, the diffusion paths of NOx and NH3 are optimized to prevent arsenic poisoning.

Benefits of technology

It achieves high-efficiency resistance to arsenic poisoning, maintains high denitrification activity and long life, is suitable for complex flue gas environments with high arsenic content, and is suitable for promotion and application in coal-fired power plants.

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Abstract

The invention relates to the technical field of flue gas denitration catalysts, in particular to an arsenic-poisoning-resistant denitration catalyst with a multilayer composite structure and a preparation method thereof.The arsenic-poisoning-resistant denitration catalyst is of a sandwich composite structure, the lower layer is a molecular sieve A loaded with bi-component active metal, and the middle layer is a molecular sieve B; the upper layer is a molecular sieve C loaded with alkali metal; the molecular sieve A is SAPO-5, the molecular sieve B is any one of MCM-41, SBA-15 and SBA-16, and the molecular sieve C is any one of ZSM-5, Beta and Y molecular sieves; preferably, the bi-component active metal comprises M1 and M2, the M1 is Cu, and the M2 is any one of Zr, In and Sb; preferably, the alkali metal is any one of Ba, Mg and Ca. The denitration catalyst disclosed by the invention has excellent arsenic poisoning resistance, and the problem of serious inactivation caused by arsenic poisoning of a traditional catalyst is effectively avoided.
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