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A kind of honeycomb low-temperature denitrification catalyst and preparation method thereof

A low-temperature denitrification and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of high active temperature window, difficulty in catalyst preparation, and increased operating costs and other problems, to achieve high low-temperature activity, broaden the activity temperature window, and improve the effect of microscopic properties

Active Publication Date: 2017-06-16
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commercially widely used catalyst is V 2 o 5 / TiO 2 It is a catalyst, but this catalyst is difficult to prepare and expensive; the active temperature window is relatively high, and the catalytic device is generally placed before the dust collector and desulfurization tower, which is prone to problems such as catalyst blockage and poisoning; its important active component V 2 o 5 Toxic, disposal of spent catalysts also increases operating costs

Method used

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  • A kind of honeycomb low-temperature denitrification catalyst and preparation method thereof
  • A kind of honeycomb low-temperature denitrification catalyst and preparation method thereof
  • A kind of honeycomb low-temperature denitrification catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1 Preparation of Catalyst C1.

[0038] Dissolve manganese acetate tetrahydrate, ferric nitrate nonahydrate, and cerium nitrate hexahydrate in 50ml deionized water to form a mixed solution, and add 20g of γ-Al to the solution 2 o 3 Powder, control the mass ratio of metal elements to carrier Mn:Fe:Ce:Al 2 o 3 =8:2:4:100. First, use a magnetic constant temperature stirrer to stir at a constant temperature of 40 ° C for 1 h, then put the sample into an ultrasonic generator for ultrasonic impregnation, the ultrasonic power is 300 W, the frequency is 30 Khz, and the impregnation time is 2 h. Then add 15g binder and make slurry, the composition of binder is: colloidal silicon dioxide 60wt%, polyvinyl alcohol 25wt% and carboxymethyl cellulose 15wt%. After stirring, put the cordierite ceramic honeycomb carrier into the slurry and impregnate it with the above ultrasonic parameters for 5 hours, then put the impregnated cordierite ceramic honeycomb carrier into a microw...

Embodiment 2

[0039] Example 2 Preparation of Catalyst C2.

[0040] The implementation steps are the same as in Example 1, other conditions remain unchanged, and the mass ratio of Mn:Fe:Ce is changed to 8:2:6 to prepare catalyst C2.

Embodiment 3

[0041] Example 3 Preparation of Catalyst C3.

[0042] The implementation steps are the same as in Example 1, other conditions remain unchanged, and the mass ratio of Mn:Fe:Ce is changed to 8:4:6 to prepare catalyst C3.

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Abstract

The invention discloses a honeycomb low-temperature denitrification catalyst. The catalyst is prepared from the following components by weight percentage: 40-50 wt% of deionized water, 15-25 wt% of carrier, 5-15 wt% of water-soluble iron salt, water-soluble 5-10 wt% of soluble manganese salt, 2-8 wt% of water-soluble cerium salt and 5-10 wt% of binder. The invention also proposes a preparation method of the above-mentioned catalyst, which includes the steps of preparation of catalyst slurry, impregnation of honeycomb skeleton structure, catalyst molding and the like. The catalyst of the invention has a wide temperature window and high low-temperature activity, which greatly improves the microscopic performance of the catalyst and improves the denitrification efficiency.

Description

technical field [0001] The invention belongs to the technical field of air pollutant control, and in particular relates to a low-temperature denitrification catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides (NOx) emitted from thermal power plants, automobile exhaust, and industrial kilns are one of the main air pollutants, which can easily cause environmental problems such as acid rain, photochemical smog, and smog, and endanger human health. According to my country's latest "Emission Standards of Air Pollutants for Thermal Power Plants", from January 1, 2012, all new coal-fired units of nitrogen oxides (NO x ) emissions must reach 100mg / m 3 , starting from January 1, 2014, the nitrogen oxide emissions of thermal power units in key areas must reach 100mg / m 3 . Therefore, the effective removal of NOx has become a key research topic in the field of environmental protection. [0003] In today's thermal power plants, the selective catal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01J35/04
Inventor 蔡森归柯庭王瑞梁辉
Owner SOUTHEAST UNIV
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