Copper-iron molecular sieve based catalyst as well as preparation method and application thereof

A molecular sieve and catalyst technology, applied in the field of copper-iron molecular sieve-based catalyst and its preparation, can solve the problems of low hydrothermal stability, narrow activity temperature range, HC compound poisoning, etc., and achieve good low-temperature denitration activity, wide temperature window, Toxic reduction effect

Active Publication Date: 2021-07-02
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rutkowska et al. (Applied Catalysis B: Environmental168-169 (2015) 531–539) prepared Fe/MCM-22 catalyst by ion exchange method, and its NH 3 -SCR performance is low, the activity temperature range

Method used

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  • Copper-iron molecular sieve based catalyst as well as preparation method and application thereof
  • Copper-iron molecular sieve based catalyst as well as preparation method and application thereof
  • Copper-iron molecular sieve based catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1 MCM-22 molecular sieve substrate was prepared;

[0025] Distilled water, NaOH, sodium aluminate, silica sol (JN-40), and hexamethyleneimide (HMI) in mass ratio 65 g: 1.5 g: 0.6 g: 23.7g: 10g mixed, stirring at least 1 h, Chen After 2 h, 7 days were crystallized at 170 ° C to obtain a precursor of solid-liquid mixed, and then the filtration was filtered to the filtrate as neutral, and the filter residue was dried directly at 110 ° C overnight, then calcined in 550 ° C. At 6 h, the obtained solid was stirred at 80 ° C for 2 times, each time 2 h, after filtration washed to the filtrate, the resulting filter residue directly dried in an 110 ° C environment, then The air was baked at 550 ° C for 6 h to give an MCM-22 molecular sieve.

Example Embodiment

[0026] Example 2 Preparation of ZSM-5 molecular sieve substations;

[0027] Distilled water, NaOH, sodium blendate, silica sol (JN-40), tetrapropylene hydroamine (TPAOH), according to mass ratio 45 g: 1.6 g: 0.9 g: 20.1 g: 9.5g mixed uniform, stirred at least 1 h, After 2 hours of Chenhua, at 170 ° C for 3 days, the precursor of solid-liquid mixed was obtained, and then the filtration was removed to the filtrate as neutral, and the filter residue was dried overnight at 110 ° C, and then baked at 550 ° C for 6 h. The solid was stirred at 80 ° C and the nitrate solution of 1 mol / L was stirred twice. After 2 h, the filtration was washed to the filtrate, the resulting filter residue was dried at 110 ° C, then calcined at 550 ° C for 6 h To obtain ZSM-5 molecular sieves.

Example

[0028] Examples 3 to 10 Preparation of copper iron molecular sieve catalysts;

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Abstract

The invention discloses a copper-iron molecular sieve based catalyst as well as a preparation method and application thereof, and belongs to the technical field of denitration catalysis in environmental protection. According to the catalyst, MCM-22 and ZSM-5 are used as carriers, and loaded metals Cu and Fe are used as active components, the content of Cu accounts for 1.5-5.0% of the total weight of the copper-iron molecular sieve-based catalyst, the content of Fe accounts for 1.5-5.0% of the total weight of the copper-iron molecular sieve-based catalyst, the general formula of the copper-iron molecular sieve-based catalyst is xCu/yFe-MCM-22/ZSM-5, wherein x is the mass percentage content of the metal Cu in the catalyst and is 2.0-4.5%, y is the mass percent content of metal Fe in the catalyst, and the value is 2.0-4.5%. The catalyst solves the problems that traditional copper-based and iron-based molecular sieve catalysts are narrow in temperature window and low in denitration activity, under the standard SCR reaction atmosphere condition, the denitration efficiency of the catalyst within the temperature range of 200-500 DEG C can reach 80% or above, and the catalyst has good low-temperature denitration activity and a wide temperature window.

Description

technical field [0001] The invention relates to a molecular sieve-based catalyst for selective catalytic reduction of nitrogen oxides by using ammonia gas, which belongs to the technical field of denitrification catalysis in environmental protection, and specifically relates to a copper-iron molecular sieve-based catalyst and its preparation method and application. Background technique [0002] Nitrogen oxide (commonly known as NOx, mainly containing NO) is a major pollutant in the atmosphere, which has great harm to the ecological environment and human health. It not only causes acid rain, but also forms near-surface atmospheric ozone pollution, secondary fine particle pollution and The precursor of surface water eutrophication, and the environmental problems caused by it have become the most prominent atmospheric environmental hotspot issues together with the destruction of the ozone layer and global climate change. The main sources of nitrogen oxides are vehicle exhaust (...

Claims

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Application Information

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IPC IPC(8): B01J29/80B01J37/02B01D53/86B01D53/56B01D53/90
CPCB01J29/80B01J37/0201B01D53/8628B01D53/90B01J29/46B01J29/7676B01J2229/18Y02T10/12
Inventor 卢丽君付本全张垒刘璞刘尚超
Owner 武汉钢铁有限公司
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