Preparation method and application of a wide temperature window denitration catalyst

A denitrification catalyst and wide temperature technology, applied in the direction of chemical instruments and methods, physical/chemical process catalysts, heterogeneous catalyst chemical elements, etc., can solve the problems of narrow temperature window, environmental hazards, poor environmental adaptability, etc., and achieve wide temperature Window, improvement of uniformity and dispersion, effect of high specific surface area

Active Publication Date: 2021-04-20
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, vanadium-tungsten-titanium catalysts not only have defects such as narrow temperature window and poor environmental adaptability, but also waste vanadium-tungsten-titanium catalysts bring great harm to the environment.

Method used

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  • Preparation method and application of a wide temperature window denitration catalyst
  • Preparation method and application of a wide temperature window denitration catalyst
  • Preparation method and application of a wide temperature window denitration catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0035]A wide temperature window denitration catalyst is composed of Ce, Zr and Ti mixed according to the molar ratio of 0.1:1:1. It is prepared by the following method: 1) First, weigh 4.2932g of zirconium nitrate pentahydrate, 1.9595g of sulfuric acid Titanium oxide and 0.4312g cerium nitrate hexahydrate were mixed and dissolved in 250mL deionized water, stirred with a magnetic stirrer for 2 to 3 hours until the solution changed from turbid to clear, and mixed solution A was obtained; 2) the amount of glucose was the total molar ratio of Ce:Zr:Ti 2.5 times the molar ratio, weighed 10.4039g glucose and dissolved it in 100mL deionized water to obtain liquid B; mixed solution B with clear liquid mixed liquid A containing cerium, zirconium and titanium to obtain mixed liquid C, and continued to stir for 30 minutes; 3) Configure the concentration 1mol / L ammonia solution, add 1mol / L ammonia solution dropwise to mixed solution C, and control the pH at 10 to obtain emulsion D, transfe...

Embodiment 2

[0038] A wide temperature window denitration catalyst, which is composed of Ce, Zr and Ti according to the molar ratio of 0.2:1:1, is prepared by the following method: 1) First, weigh 4.2932g zirconium nitrate pentahydrate, 1.9595g sulfuric acid Titanium oxide and 0.8682g of cerium nitrate hexahydrate were mixed and dissolved in 250mL of deionized water, stirred with a magnetic stirrer for 2 to 3 hours until the solution changed from turbid to clear, and mixed solution A was obtained; 2) the amount of glucose was the total molar ratio of Ce:Zr:Ti 2.5 times the molar ratio, weighed 10.4039g glucose and dissolved it in 100mL deionized water to obtain liquid B; mixed solution B with clear liquid mixed liquid A containing cerium, zirconium and titanium to obtain mixed liquid C, and continued to stir for 30 minutes; 3) Configure the concentration 1mol / L ammonia solution, add 1mol / L ammonia solution dropwise to mixed solution C, and control the pH at 10 to obtain emulsion D, transfer...

Embodiment 3

[0041] A wide temperature window denitration catalyst is composed of Ce, Zr and Ti mixed according to the molar ratio of 0.3:1:1. It is prepared by the following method: 1) First, weigh 4.2932g of zirconium nitrate pentahydrate, 1.9595g of sulfuric acid Titanium oxide and 1.3024g cerium nitrate hexahydrate were mixed and dissolved in 250mL deionized water, and stirred with a magnetic stirrer for 2 to 3 hours until the solution changed from turbid to clear to obtain mixed solution A; 2) the amount of glucose was the total molar ratio of Ce:Zr:Ti 2.5 times the molar ratio, weighed 11.3948g glucose and dissolved it in 100mL deionized water to obtain liquid B; mixed solution B with clear liquid mixed liquid A containing cerium, zirconium and titanium to obtain mixed liquid C, and continued to stir for 30 minutes; 3) Configure the concentration 1mol / L ammonia solution, add 1mol / L ammonia solution dropwise to mixed solution C, and control the pH at 10 to obtain emulsion D, transfer t...

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Abstract

The invention belongs to the technical field of catalysts, and in particular relates to a preparation method and catalytic application of a low-toxicity denitration catalyst with a wide temperature window. The catalyst is composed of CeO 2 , ZrO 2 and TiO 2 The three components are formed in the form of composite oxides; the Ce:Zr:Ti molar ratio is 0.1-0.5:1:1. The present invention adopts the cerium-zirconium-titanium catalyst synthesized by the glucose hydrothermal method, cleverly uses the polyhydroxyl chelation of glucose, forms a coordination bond and binds around the cerium-zirconium-titanium particles, and then under high temperature conditions, the glucose wrapped around the catalyst generates Carbonization burns out, makes catalyst surface produce more oxygen vacancies and defects; CeO synthesized by this method 2 -ZrO 2 -TiO 2 Catalyst at 30000h ‑1 Excellent catalytic reduction of NO with high space velocity and wide temperature range from 200°C to 400°C X Performance and activity are above 80%, and the activity at 280-340°C is close to 100%. It shows that the catalyst has a wider temperature window and wider applicability.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a preparation method and application of a wide temperature window denitration catalyst. Background technique [0002] Nitrogen oxides (NOx) are the main pollutants that cause air pollution, among which the most harmful are NO, NO 2 and N 2 O three nitrogen oxides. Nitrogen oxides can cause acid rain, which can cause burns to ecological trees and crops, reduce yields, and corrode buildings to reduce their service life. In addition, nitrogen oxides can also cause photochemical pollution, which will have a huge impact on human health. For example, the inhalation of NO can cause human poisoning, and in severe cases, it will be life-threatening. [0003] Selective catalytic reduction of ammonia (NH 3 -SCR) technology is the most effective method to deal with the hazards of nitrogen oxides and is widely used. The core of SCR catalytic technology is the out-of-stock c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/10B01D53/86B01D53/56
CPCB01D53/8628B01D2251/2062B01J23/002B01J23/10B01J2523/00B01J2523/3712B01J2523/47B01J2523/48
Inventor 谢峻林公丕军何峰李凤祥方德齐凯
Owner WUHAN UNIV OF TECH
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