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Selective catalysis reduction denitrate catalyst for composite carrier flue gas and preparation method thereof

A composite carrier and selective technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem that catalyst activity and service life are difficult to meet large-scale industrial devices Process requirements, limited loading of active substances and other issues, to achieve the effect of wide activation temperature window, high mechanical strength and high catalytic activity

Active Publication Date: 2009-05-13
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Impregnated and coated catalysts are difficult to meet the process requirements of large-scale industrial plants due to the limited loading of active substances, and the activity and service life of catalysts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Mixing 70% by mass of nano anatase titanium dioxide, 10% by mass of cordierite, and 20% by mass of ceramic fibers and calcining at a temperature of 600°C to obtain a porous stable Composite carrier with microporous structure;

[0021] 2) stirring vanadium pentoxide at a temperature of 70° C. to dissolve it in an oxalic acid solution to obtain a solution with a pH value less than 2;

[0022] 3) Stir the ammonium tungstate at 70°C to dissolve it in the oxalic acid solution to obtain a solution with a pH value less than 7;

[0023] 4) Stir ammonium molybdate at a temperature of 50°C to 70°C to dissolve it in oxalic acid solution or deionized water to obtain a solution with a pH value of less than 7;

[0024] 5) Mix and knead the solution obtained in step 2), the solution obtained in step 3) and the solution obtained in step 4) with the composite carrier obtained in step 1), deionized water, binder, and lubricant, and stale for 12 hours to obtain Catalyst mud, the comp...

Embodiment 2

[0028] The catalyst prepared in Example 1 was pulverized and sieved to obtain catalyst particles with a particle diameter between 60 mesh and 30 mesh. Get 2 ml of the catalyst particles and put them into a catalyst activity evaluation device. in the machine. NO / N 2 , NH 3 / N 2 , O 2 and N 2 After being controlled by a mass flow meter, the simulated flue gas is mixed to obtain a composition of 0.1% NO, 0.08% SO 2 , 8% H 2 O, 0.1% NH 3 and 3% O 2 , N 2 For balance gas, the air speed is 18000h -1 . The reaction temperature is 370°C, and the NH3 / NOx is 1. The gas composition is detected by ULTRMAT 23 gas analyzer manufactured by German SIEMENS company, and its denitrification efficiency is 80%.

Embodiment 3

[0030]1) Mixing nano-anatase titanium dioxide with a mass percentage of 99.8%, cordierite with a mass percentage of 0.1%, and ceramic fibers with a mass percentage of 0.1% and calcining at a temperature of 500°C to 600°C to obtain a porous stable Composite carrier with microporous structure;

[0031] 2) stirring the ammonium metavanadate at a temperature of 50° C. to dissolve it in the oxalic acid solution to obtain a solution with a pH value less than 2;

[0032] 3) Stir the ammonium tungstate at 50°C to dissolve it in the oxalic acid solution to obtain a solution with a pH value less than 7;

[0033] 4) Stir ammonium molybdate at 50°C to dissolve it in oxalic acid solution or deionized water to obtain a solution with a pH value less than 7;

[0034] 5) Mix and knead the solution obtained in step 2), the solution obtained in step 3) and the solution obtained in step 4) with the composite carrier obtained in step 1), deionized water, binder, and lubricant, and stale for 48 ho...

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Abstract

The invention discloses a composite-carrier catalyst for selective catalytic reduction in flue gas denitrification, and a preparation method thereof. The carrier of the catalyst is a composite carrier. The composite carrier comprises anatase titanium dioxide nanoparticles and / or cordierite and / or ceramic fibers. The composite carrier has a microporous structure with stable pores. The catalyst is prepared by the co-mixing process which comprises the following steps: dissolving active components to obtain a solution with a pH value less than 2 or dissolving active components together with components of a catalyst promoter to obtain a solution; mixing the resulting solution with the composite carrier, deionized water, binders and lubricants, kneading, curing, kneading, filtering under a high pressure, molding, drying and calcining. The composite-carrier catalyst has the advantages of high mechanical strength, high catalytic activity and broad active temperature window rang, and is widely applied to the catalytic reduction of nitrogen oxides in the selective catalytic reduction of flue gas denitrification.

Description

technical field [0001] The invention relates to a catalyst and a preparation method, in particular to a flue gas selective catalytic reduction method denitrification composite carrier catalyst and a preparation method. Background technique [0002] NOx is generally nitrogen monoxide (NO) and nitrogen dioxide (NO 2 ) is a general term for two kinds of nitrogen oxides, which are one of the main pollutants in the atmosphere and will cause serious harm to human health and the environment. Since the beginning of the 21st century, the NOx emission problem has attracted more and more attention from the governments of various countries, and its emission standards have become increasingly stringent. NOx control technologies at home and abroad mainly include selective catalytic reduction method, selective non-catalytic reduction method, low NOx combustion technology and combustion optimization control technology and so on. Selective catalytic reduction (SCR) is a technology for remo...

Claims

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Application Information

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IPC IPC(8): B01J23/24B01J23/16B01D53/56
Inventor 高翔骆仲泱岑可法倪明江施正伦周劲松方梦祥余春江王树荣程乐鸣王勤辉吴卫红张涌新付智明
Owner ZHEJIANG UNIV
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