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Denitration catalyst with excellent alkali metal and alkaline-earth metal poisoning resistance

A denitration catalyst and catalyst technology, which are applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., to achieve the effects of good selectivity, low sulfur dioxide oxidation rate and low cost

Active Publication Date: 2012-06-20
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, a large number of patents at home and abroad have disclosed various types of denitrification catalysts and preparation processes, but there is a lack of catalysts with good resistance to alkali metals and alkaline earth metals.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of protonated titanium nanotubes: the molar ratio of raw materials is titanium dioxide: water: sodium hydroxide=1: 80: 30, and titanium dioxide adopts commercial P25 (produced by German Degussa company, particle size 20-45nm, which contains anatase TiO 2 about 70%, rutile about 30%). Dissolve sodium hydroxide in water to prepare a strong alkali solution, then add P25 to the strong alkali solution and stir for 12 hours, then pour it into a hydrothermal kettle and heat it at 130°C for 24 hours, the filling degree is 70%, the sample after hydroheating Wash the sample with dilute hydrochloric acid with a pH value of 1.8 until the pH value of the sample is less than 2, then wash the sample with deionized water until the pH value is 6.5, then soak the sample in excess ethanol for 24 hours, and dry the soaked sample at 80°C .

[0025] Loading active material and cocatalyst by impregnation method: take 1 gram of cerous nitrate hexahydrate as the active material pre...

Embodiment 2

[0029] Preparation of protonated titanium nanotubes: the molar ratio of raw materials is titanium dioxide: water: sodium hydroxide = 1: 150: 50, and titanium dioxide is anatase TiO prepared by hydrothermal method 2 . Dissolve sodium hydroxide in water to prepare a strong alkali solution, then add P25 to the strong alkali solution and stir for 12 hours, then pour it into a hydrothermal kettle and heat it at 150°C for 24 hours, the filling degree is 75%, and the sample after hydroheating Wash the sample with dilute hydrochloric acid with a pH value of 1.6 until the pH value of the sample is less than 2, then wash the sample with deionized water until the pH value is 6.5, then soak the sample in excess acetone for 24 hours, and dry the soaked sample at 60°C .

[0030] Catalyst preparation: Dissolve 2 grams of ammonium tungstate in saturated oxalic acid solution, then add 10 grams of protonated titanium nanotubes, stir for 6 hours, dry at 60°C, burn at 450°C for 4 hours, then put...

Embodiment 3

[0034] Preparation of protonated titanium nanotubes: the molar ratio of raw materials is titanium dioxide: water: potassium hydroxide=1: 200: 80, and titanium dioxide adopts commercial P25 (produced by German Degussa company, particle size 20~45nm, which contains anatase TiO 2 about 70%, rutile about 30%). Dissolve potassium hydroxide in water to prepare a strong alkali solution, then add P25 to the strong alkali solution and stir for 12 hours, then pour it into a hydrothermal kettle and heat it at 170°C for 36 hours, the filling degree is 70%, the sample after hydroheating Wash the sample with dilute hydrochloric acid with a pH value of 1.6 until the pH value of the sample is less than 2, then wash the sample with deionized water until the pH value is 5.5, then soak the sample in excess ethanol for 24 hours, and dry the soaked sample at 80°C .

[0035] Catalyst preparation: Dissolve 1 gram and 1 gram of germanium oxide and copper nitrate in water, then add 7 grams of protona...

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Abstract

The invention discloses a selective catalytic reduction denitration catalyst. The selective catalytic reduction denitration catalyst comprises a carrier, an active substance and a cocatalyst, wherein the carrier is a protonated titanium nanotube; the active substance is a transition metal oxide which is obtained by firing an active substance precursor; and the cocatalyst is a transition metal oxide which is obtained by firing a cocatalyst precursor. The invention also discloses a preparation method for the selective catalytic reduction denitration catalyst. The preparation method comprises the following steps: performing hydrothermal treatment to titanium dioxide (TiO2) particles and a strong alkali solution; washing with acid; washing with water; soaking into an organic solvent; drying to obtain the protonated titanium nanotube; and loading the active substance and the cocatalyst by an immersion method. The preparation method for the catalyst is simple, safe and low in cost. Comparedwith the traditional commercial catalyst, the prepared catalyst has a longer service life and has an unique advantage in smoke with high alkali metal and alkaline-earth metal contents.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a selective catalytic reduction denitrification catalyst, which is suitable for the denitrification of various flue gases, and is suitable for cement kiln tail gas and biomass fuel boiler flue gas with high content of alkali metals and alkaline earth metals. Exhaust gases are particularly suitable. Background technique [0002] Nitrogen oxides, as one of the main air pollutants, have received extensive attention in recent years. Nitrogen oxide emissions can be divided into stationary sources and mobile sources according to their sources. The sources of stationary nitrogen oxides include coal-fired power stations, sintering machines, cement kilns, biomass power stations, and industrial boilers. [0003] In recent years, my country has intensified the control of nitrogen oxide emissions from stationary sources, and the nitrogen oxide emission standards have become in...

Claims

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Application Information

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IPC IPC(8): B01J23/28B01J23/30B01J23/835B01J21/06B01J35/10B01D53/86B01D53/56
Inventor 吴忠标王海强陈雄波刘越
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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