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Catalyst for hydrogen selective catalytic reduction of nitrogen oxides and its application

A technology of nitrogen oxides and catalysts, which is applied in the field of catalysts for hydrogen selective catalytic reduction of nitrogen oxides, achieving the effects of low reaction temperature, wide range of raw materials, and energy saving

Active Publication Date: 2017-12-22
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the H on noble metals and molecular sieves 2 -The research and practical application of SCR catalysts for hydrogen selective catalytic reduction of nitrogen oxides are rarely published, but the introduction of rare earth metal elements into catalysts of noble metals and molecular sieves has not been reported

Method used

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  • Catalyst for hydrogen selective catalytic reduction of nitrogen oxides and its application
  • Catalyst for hydrogen selective catalytic reduction of nitrogen oxides and its application
  • Catalyst for hydrogen selective catalytic reduction of nitrogen oxides and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Preparation of Pt-Ce / SAPO-34 catalyst

[0026] Ce(NO 3 ) 3 Completely dissolve in water to obtain a 1M solution, add the template-removed SAPO-34 (Si / Al=0.1) to the above solution, control the mass fraction of Ce / SAPO-34 to 0.02, stir at room temperature and dry the remaining at 80°C moisture, and then calcined at 500°C for 6h to obtain 2%Ce / SAPO-34. Using chloroplatinic acid solution as precursor, 0.5%Pt was introduced into 2%Ce / SAPO-34 by isometric impregnation method, and then calcined at 550℃ for 6h to obtain 0.5%Pt-2%Ce / SAPO-34.

[0027] 2) The 0.5%Pt-2%Ce / SAPO-34 catalyst is wet-coated on the surface of the cordierite honeycomb ceramic substrate, and the coating amount of the 0.5%Pt-2%Ce / SAPO-34 catalyst is 20%.

[0028] 3) Put 5g of 0.5%Pt-2%Ce / SAPO-34 / cordierite monolithic catalyst into a stainless steel fixed-bed reactor with a length of 50cm and an inner diameter of 2cm. The catalyst is placed in the central constant temperature zone of the reactor, at t...

Embodiment 2

[0032] 1) Preparation of Pt-La / ZSM-5 catalyst

[0033] La(NO 3 ) 3 Completely dissolve in water to obtain a 1M solution, add the template-removed ZSM-5 (Si / Al=30) to the above solution, control the mass fraction of La / ZSM-5 to 0.05, stir at room temperature and dry the remaining moisture, and then calcined at 550°C for 6h to obtain 5%La / ZSM-5. Using chloroplatinic acid solution as precursor, 0.3%Pt was introduced into 5%La / ZSM-5 by isometric impregnation method, and then calcined at 550℃ for h to obtain 0.3%Pt-5%La / ZSM-5.

[0034] 2) The 0.3% Pt-5% La / ZSM-5 catalyst is directly extruded to obtain a self-supporting monolithic catalyst.

[0035]3) Put 5 g of 0.3% Pt-5% La / ZSM-5 monolithic catalyst into a stainless steel fixed-bed reactor with a length of 50 cm and an inner diameter of 2 cm. The catalyst is placed in the central constant temperature zone of the reactor. At the reaction inlet: nitrogen oxidation Hydrogen=2500ppm; Oxygen=5%; Water vapor=10%; Sulfur dioxide=20pp...

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PUM

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Abstract

The invention relates to a catalyst for nitrogen oxide hydrogen selective catalytic reduction and application thereof. The catalyst is composed of noble metal active component Pt, rare earth element additives (La, Ce, Sm, etc.) and molecular sieve carriers (MFI, BEA, CHA, FER, MOR, etc.). Using hydrogen as a reducing agent, nitrogen oxides can be converted into harmless nitrogen under oxygen-enriched conditions using the above-mentioned catalyst. The conditions of the reaction are that the reaction temperature is 100-400°C, the nitrogen oxide concentration is 100-2000ppm, the hydrogen / nitrogen oxide ratio is 2-6, and the reaction volume space velocity (GHSV) is 1000-60000h-1. The invention provides a catalyst for purifying nitrogen oxides with high performance, which can achieve a higher conversion rate of nitrogen oxides, has a simple process flow, is green and energy-saving, and is suitable for large-scale industrial promotion and application.

Description

technical field [0001] The invention relates to a catalyst for selective catalytic reduction of nitrogen oxide hydrogen and its application. Background technique [0002] Nitrogen oxides (NOx) are a class of major air pollutants, mainly including nitric oxide (NO) and nitrogen dioxide (NO 2 ). Nitrogen oxides cause serious harm to the ecological environment. It is the main species that causes acid rain and photochemical smog. It can cause redness and swelling of human eyes, vision loss, shortness of breath, headache, pulmonary edema and other diseases, and even threaten human life. Nitrogen oxides have been widely concerned all over the world due to their great harm and difficult to eliminate. Catalytic reduction is the main method for purifying nitrogen oxides. Under the action of a specific catalyst, nitrogen oxides can be reduced to harmless nitrogen. Using ammonia as the reducing agent, the technology of selective catalytic reduction of NOx (NH 3 -SCR) was developed ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/85B01J29/44B01D53/90B01D53/56
Inventor 李兰冬关乃佳武光军戴卫理
Owner NANKAI UNIV