Catalyst for performing selective catalytic reduction on nitrogen oxide by ammonia

A nitrogen oxide, selective catalysis technology, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical/physical processes, etc., to achieve the effect of wide range of raw materials, low reaction temperature, and excellent nitrogen oxide purification effect

Active Publication Date: 2015-03-25
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention is a novel green high-performance nitrogen oxide ammonia selective reduction catalyst

Method used

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  • Catalyst for performing selective catalytic reduction on nitrogen oxide by ammonia

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation of Fe-Ce / Beta Catalyst

[0021] 1) Preparation of 1M Ce(NO 3 ) 3 Aqueous solution, the Beta molecular sieve (Si / Al=25, purchased from Tianjin Shenneng Technology Co., Ltd.) that has been removed from the template is added to the above solution, and the mass fraction of Ce / beta molecular sieve is controlled according to the metering ratio to be 5%. After stirring at room temperature, The remaining moisture was dried at 80°C, and then calcined at 500°C for 6 hours to obtain 5% Ce / beta.

[0022] 2) with 1M ferrous sulfate solution as precursor, introduce Fe in 5% Ce / Beta by ion exchange method, exchange method is: take by weighing 5% Ce / Beta sample 100g and place in the round bottom flask of 250ml, then according to Add 50ml of ferrous sulfate solution in a metered ratio, then add deionized water to 200ml, stir in a water bath at 80°C for 12h, then suction filter, wash and dry. The above steps were repeated three times, and finally the mass content of Fe was...

Embodiment 2

[0025] Preparation of Fe-La / ZSM-5-Beta Catalyst

[0026] 1) Weigh a certain amount of La(NO 3 ) 3 Completely soluble in water, 1M La(NO 3 ) 3 Aqueous solution, ZSM-5 (Si / Al=25, purchased from Tianjin Shenneng Technology Co., Ltd.) and Beta molecular sieve were added to the above solution according to the mass ratio of 1 / 1 (Si / Al=30), and the control The mass fraction of La / molecular sieve was 0.1, and the remaining moisture was dried at 80°C after stirring at room temperature, and then calcined at 550°C for 6 hours to obtain 10% La / ZSM-5-Beta.

[0027] 2) Using 1M ferrous sulfate solution as a precursor, introduce Fe into 10% La / ZSM-5-Beta by ion exchange method, the exchange method is: weigh 100g of 10% La / ZSM-5-Beta sample and place it in 250ml Then add 50ml of ferrous sulfate solution according to the metering ratio, then add deionized water to 200ml, stir for 18h under the condition of 80°C water bath, then suction filter, wash and dry. The above steps were repeated t...

Embodiment 3

[0030] Application of Fe-Ce / Beta Catalyst in Selective Catalytic Reduction of Nitrogen Oxide and Ammonia

[0031] Put 5g of 1.6%Fe-5%Ce / Beta / 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 the reaction inlet: nitrogen oxide =1000ppm; Ammonia = 1050ppm; Oxygen = 5%; Water vapor = 8%; Sulfur dioxide = 25ppm; -1 .

[0032] 4) The product is analyzed online with a nitrogen oxide analyzer and a small mass spectrometer. The model of nitrogen oxide analyzer used is Swiss Eco Physics CLD62, the model of mass spectrometer is German Pfeiffer Omnistar, and the test results of catalytic reaction are shown in figure 1 .

[0033] Catalytic results show that: 1.6%Fe-5%Ce / Beta has excellent NH3 -SCR performance, the conversion rate of nitrogen oxides can reach 97% at 300°C, and the concentration of nitrogen oxides at the outlet is lo...

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Abstract

The invention relates to a catalyst for performing selective catalytic reduction on nitrogen oxide by ammonia and application thereof. The catalyst comprises the components including an active component Fe, a rare earth element auxiliary (La, Ce or Sm) and a molecular sieve carrier (Beta or a mixture of Beta and ZSM-5); ammonia is used as a reducing agent, and nitrogen oxide can be converted into harmless nitrogen by using the catalyst under an oxygen enrichment condition; the reaction conditions are as follows: the reaction temperature is 200-500 DEG C, the concentration of nitrogen oxide is 100-2000ppm, the proportion of ammonia to nitrogen oxide is 1 to 1.1 and the gaseous hourly space velocity (GHSV) is 1,000-60,000h-1. The catalyst capable of purifying nitrogen oxide with high performance is environmentally friendly, free of toxicity, low in application reaction temperature, high in conversion rate of nitrogen oxide and suitable for large-scale industrial popularization and application.

Description

technical field [0001] The invention relates to a catalyst for selective catalytic reduction of nitrogen oxide ammonia. 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 and patented by Engel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/76B01J29/80B01D53/56B01D53/86
Inventor 李兰冬关乃佳武光军戴卫理闫慧忠王学明
Owner NANKAI UNIV
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