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Waste gas denitration composite catalyst and preparation method thereof

A composite catalyst and catalyst technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of high operating cost, short service life, poor sulfur resistance and water resistance, etc., and achieve operating cost Low, long service life, good moisture resistance

Inactive Publication Date: 2017-12-12
TIANJIN VOCATIONAL INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Perovskite catalysts still have the problems of poor sulfur and water resistance, short service life and high operating costs. It is necessary to optimize and improve perovskite denitration catalysts so that the application potential of perovskite denitration catalysts can be fully utilized.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Catalyst support ZrO 2 100g was added to an aqueous solution containing 0.4g of cationic surfactant dodecyltrimethylammonium bromide, 1g of fluoroboric acid and 1000g of water, and stirred at 40-50°C to make ZrO 2 The surface is activated for 4 hours, then filtered, washed and dried for later use. The chemical reagents sodium selenite 3.4g (0.02mol), lanthanum nitrate 29.3g (0.05mol), yttrium nitrate 19.2g (0.05mol), cobalt chloride 16.6g (0.1mol) and citric acid 38.4g (0.2mol ) was dissolved in deionized water to prepare a 0.5mol / L solution for later use.

[0028] The pretreated ZrO 2 Add 100g of the carrier into the sodium selenite solution, immerse, stir and absorb for 1h, then slowly add dilute nitric acid solution dropwise until the pH of the solution is 3-4 and the precipitation is complete. 2 Formation of SeO on the support 2 Precipitated, washed with deionized water to remove the generated sodium nitrate, ZrO 2 The carrier is dried, further burned at 300-4...

Embodiment 2

[0031] Catalyst support Al 2 o 3 Add 100g to the aqueous solution containing 0.4g of cationic surfactant dodecyltrimethylammonium bromide, 1g of fluoroboric acid and 1000g of water, stir at 40-50°C to make Al 2 o 3 The surface is activated for 8 hours, then filtered, washed and dried for later use. The chemical reagents sodium tellurite 2.2g (0.01mol), lanthanum nitrate 46.8g (0.08mol), yttrium nitrate 7.7g (0.02mol), chromium trichloride 15.5g (0.1mol) and citric acid 48g (0.25mol ) was dissolved in deionized water to prepare a 0.5mol / L solution for later use.

[0032] The pretreated Al 2 o 3 Add 100g of the carrier into the sodium tellurite solution for impregnation, stir and absorb for 0.5h, then slowly add dilute nitric acid solution dropwise until the pH of the solution is 3-4 and the precipitation is complete. 2 o 3 TeO formed on the support 2 Precipitated, washed with deionized water to remove the generated sodium nitrate, Al 2 o 3 The carrier is dried, furth...

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Abstract

The invention relates to a waste gas denitration composite catalyst and a preparation method thereof. The waste gas denitration composite catalyst is prepared from a perovskite type catalyst, a catalyst promoter and a catalyst carrier, wherein the formula of the perovskite type catalyst is ABO3, the site A represents a mixture of rare earth metals La (lanthanum) and Y (yttrium), and the site B represents one or a mixture of transition metals Cr (chromium), Mn (manganese), Fe (iron) and Co (cobalt); the catalyst promoter is selected from one or a mixture of SeO2 (selenium dioxide), TeO2 (tellurium dioxide) and PtO2 (platinum dioxide), so as to prevent the deactivation caused by the fact that oxygen atoms in the perovskite type catalyst ABO3 is replaced by sulfur atoms in waste gas; the catalyst carrier is selected from one of TiO2 (titanium dioxide), ZrO2 (zirconium dioxide), SiO2 (silicon dioxide), SnO2 (tin dioxide), Al2O3 (aluminium oxide), zeolite and cordierite; 10g of waste gas denitration composite catalyst is loaded into a fixed bed catalyzing reactor, the NO (nitric oxide)-containing waste gas produced by burning the volatile organic matter is treated at the temperature of 300 DEG C, and the removal rate of NO is 92.9% to 95.8%. The waste gas denitration composite catalyst has the advantages that the water-resistant and sulfur pollution-resistant properties are good, the service life is long, and the running cost is low.

Description

technical field [0001] The invention relates to a waste gas denitrification composite catalyst and a preparation method thereof, belonging to the fields of environmental protection and new materials. Background technique [0002] According to Beijing PM 2.5 Source analysis of the latest research results, Beijing's annual PM 2.5 Among the sources, the "contribution" of regional transmission accounts for about 28% to 36%, and the "contribution" of local pollution discharge accounts for 64% to 72%. Among the "contributions" of local pollution, motor vehicle emissions (31.1%), coal combustion (22.4%), and industrial production (18.1%) accounted for the top three. Among them, in addition to the direct emission of PM from motor vehicles 2.5 In addition, PM is also released 2.5 "Raw materials" and "catalysts" for secondary aerosols. [0003] According to the 2015 National Environmental Monitoring Work Site Meeting, motor vehicles, industrial production, coal burning, and flyin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/057B01J35/10B01J37/03B01J37/08B01J37/04B01D53/94B01D53/56
CPCB01D53/9413B01J27/0573B01J27/0576B01J37/035B01J37/04B01J37/08B01J37/082B01J35/615
Inventor 李建生刘炳光王少杰尹浩南张腾
Owner TIANJIN VOCATIONAL INST
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