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Monatomic Ir denitration catalyst based on TiO2 mesocrystals and preparation method thereof

A denitrification catalyst and catalyst technology, applied in physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, chemical instruments and methods, etc., can solve problems such as high operating temperature window and poisonous V-based catalysts , to achieve the effect of mild preparation method and good low-temperature denitrification activity

Active Publication Date: 2020-07-28
HENAN UNIV OF URBAN CONSTR
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Problems solved by technology

[0005] The object of the present invention is to provide a single-atom Ir denitration catalyst and preparation method based on TiO2 mesogen to solve the above-mentioned background technology The problems of high operating temperature window and poisonous V-based catalysts in existing denitrification technologies proposed in

Method used

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  • Monatomic Ir denitration catalyst based on TiO2 mesocrystals and preparation method thereof
  • Monatomic Ir denitration catalyst based on TiO2 mesocrystals and preparation method thereof
  • Monatomic Ir denitration catalyst based on TiO2 mesocrystals and preparation method thereof

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preparation example Construction

[0020] The present invention also provides a TiO-based 2 Preparation method of mesogenic single-atom Ir denitration catalyst based on TiO 2 The preparation method of the mesogenic single-atom Ir denitration catalyst comprises the following steps;

[0021] S1: TiO 2 -Modification of MC: react with dopamine hydrochloride or levodopa solution (PH=8.5) with a concentration of 1-2 g / L for 24 hours to obtain functionalized PDA@TiO 2 ;

[0022] S2: The use of dopamine hydrochloride or levodopa on TiO 2 -MC carrier was modified to obtain PDA@TiO 2 -MC modified carrier, obtained PDA@TiO 2 -MC modified carrier was stirred in deionized water for 8h;

[0023] S3: add a certain concentration of chloroiridic acid aqueous solution into S2, stir and react for 8 hours, filter, wash with water, wash with alcohol and dry at 12°C;

[0024] S4: Utilize the redox reaction between the amino group on PDA and chloroiridic acid, the reaction temperature is 50-90°C;

[0025] S5: On PDA@TiO 2 In...

Embodiment 1

[0027] 1) TiO 2 Mesogen (TiO 2 -MC) modification, will quantify TiO 2 -MC dispersed in 1-2g / L dopamine hydrochloride solution (PH=8-10), stirred continuously at room temperature for 24h, filtered, washed with water, washed with alcohol to obtain PDA@TiO 2 -MC modified carrier.

[0028] 2) According to Ir / TiO 2 -MC = 0.02, will quantify PDA@TiO 2 -MC modified carrier and chloroiridic acid are dispersed in quantitative deionized water, heated to 60-90°C, stirred for 6 hours, filtered, washed with water, washed with alcohol, and dried at 110°C to obtain 0.02Ir / PDA@TiO 2 -MC single-atom denitration catalyst.

[0029] Denitrification activity test conditions: the total flow rate of simulated flue gas is 700mL / min, [NO]=[NH 3 ]=500ppm, [O 2 ] = 5%, N 2 As a balance gas, the space velocity is 28000mL·g -1 h -1 , measured 0.02Ir / PDA@TiO 2 The denitrification rate of -MC single-atom catalyst reaches 40.6%-75.9% at 180-300°C.

Embodiment 2

[0031] 1) TiO 2 Mesogen (TiO 2 -MC) modification, will quantify TiO 2 -MC dispersed in 1-2g / L dopamine hydrochloride solution (PH=8-10), stirred continuously at room temperature for 24 hours, filtered, washed with water, and washed with alcohol to obtain PDA@TiO 2 -MC modified carrier.

[0032] 2) According to Ir / TiO 2 -MC = 0.04, will quantify PDA@TiO 2 -MC modified carrier and chloroiridic acid were dispersed in quantitative deionized water, heated to 60-90°C, stirred for 6 hours, filtered, washed with water, washed with alcohol, and dried at 110°C to obtain 0.04Ir / PDA@TiO 2 -MC single-atom denitrification catalyst.

[0033] Denitrification activity test conditions: the total flow rate of simulated flue gas is 700mL / min, [NO]=[NH 3 ]=500ppm, [O 2 ] = 5%, N 2 As a balance gas, the space velocity is 28000mL·g -1 h -1 , measured 0.04Ir / PDA@TiO2 The denitrification rate of -MC single-atom catalyst reaches 46.0%-82.7% at 180-300°C.

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Abstract

The invention discloses a monatomic Ir denitration catalyst based on TiO2 mesocrystals in the technical field of denitration catalyst preparation. A carrier of the catalyst is mesocrystal TiO2-MC, theactive component is a single-atom Ir metal, and the molar ratio of Ir / TiO2 to MC is 0.02 to 0.08. TiO2-MC is used as a carrier, the modification effect of dopamine hydrochloride or levodopa is utilized, and a redox reaction between Ir<4+> and NH2<-> is combined. According to the TiO2 mesocrystal-based monatomic Ir denitration catalyst and a preparation method thereof, TiO2-MC is used as a carrier, the modification effect of dopamine hydrochloride or levodopa is utilized, the redox reaction between Ir<4+> and NH2<-> is combined, a secondary functionalized platform is obtained on the TiO2 mesocrystal, and by combining the redox effect of Ir<4+> and NH2<-> groups on chloroiridic acid, the catalyst provides good low temperature denitration activity at a temperature of 180-300 DEG C, and the preparation method is mild, safe and environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of preparation of denitrification catalysts, specifically a TiO-based 2 Mesogenic single-atom Ir denitration catalyst and preparation method. Background technique [0002] Denitration catalyst generally refers to the catalyst used in the SCR denitration system of the power plant. In the SCR reaction, the reducing agent is selectively reacted with the nitrogen oxides in the flue gas at a certain temperature. At present, the commercial SCR catalysts are basically with TiO 2 as the carrier, with V 2 o 5 As the main active ingredient, with WO 3 、MoO 3 It is an auxiliary component for anti-oxidation and anti-poisoning. The catalyst type can be divided into three types: plate type, honeycomb type and corrugated plate type. The plate type catalyst is based on a metal mesh pressed from a stainless steel metal plate. 2 , V 2 o 5 The mixture of etc. adheres to the stainless steel mesh, and after pressing and c...

Claims

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Application Information

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IPC IPC(8): B01J31/02B01D53/86B01D53/56
CPCB01J31/0235B01D53/8628
Inventor 张延兵程相龙陈英赞任海波郭晋菊宋城建刘丽华李刚
Owner HENAN UNIV OF URBAN CONSTR
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