Method for enhancing catalytic denitrification activity of material by electron-beam irradiation modification and application thereof

A technology of electron beam irradiation and modification, which is applied in chemical instruments and methods, catalyst activation/preparation, separation methods, etc. Effect

Active Publication Date: 2017-03-15
INST OF HIGH ENERGY PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reduction of the noble metal loading will lead to a significant decrease in the low-temperature activity of the Pd catalyst.

Method used

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  • Method for enhancing catalytic denitrification activity of material by electron-beam irradiation modification and application thereof
  • Method for enhancing catalytic denitrification activity of material by electron-beam irradiation modification and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Irradiate 0.5% Pd / TiO under the condition of dose rate 50Gy / s and irradiation dose 10kGy 2 -Al 2 o 3 Catalyst preparation

[0023] a) On a rotary evaporator, 16.02 grams of aluminum isopropoxide was hydrolyzed at 90°C for 4 hours with deionized water, dilute nitric acid was added to form a transparent sol, and then 8.52 grams of tetrabutyl titanate was added to make TiO 2 and Al 2 o 3 The mass ratio is 2:8, stirred for 6 hours to form a gel;

[0024] b) Aging the gel obtained in step a) for 24 hours at room temperature, drying at 120°C for 12 hours, and finally roasting in a muffle furnace at 500°C for 4 hours to obtain TiO 2 -Al 2 o 3 ;

[0025] c) get the TiO obtained in step b) 2 -Al 2 o 3 In the three-necked flask, add 4.7ml of 0.1mol / L PdCl 2 Solution, 9.4×10 -3 mol polyvinylpyrrolidone (PVP) and 4.7×10 -3 mol polyethylene glycol solution and mix, pass through N 2 With protective gas and circulating condensed water, the temperature was gradually rais...

Embodiment 2

[0028] Irradiate 0.5% Pd / TiO under the condition of dose rate 50Gy / s and irradiation dose 50kGy 2 -Al 2 o 3 Catalyst preparation

[0029] a) Use deionized water on a rotary evaporator to hydrolyze 16.02 grams of aluminum isopropoxide at 90 ° C for 8 hours, add dilute nitric acid to form a transparent sol, and then add 8.52 grams of tetrabutyl titanate to make TiO 2 and Al 2 o 3 The mass ratio is 2:8, stirring for 10 hours, the formed gel;

[0030] b) Aging the gel obtained in step a) for 24 hours at room temperature, drying at 120°C for 10 hours, and finally roasting in a muffle furnace at 500°C for 4 hours to obtain TiO 2 -Al 2 o 3 ;

[0031] c) get the TiO obtained in step b) 2 -Al 2 o 3 In the three-necked flask, add 4.7ml of 0.1mol / L PdCl 2 Solution, 9.4×10 -3 mol polyvinylpyrrolidone (PVP) and 4.7×10 -3 mol polyethylene glycol solution and mix, pass through N 2 With protective gas and circulating condensed water, the temperature was gradually raised to 160°...

Embodiment 3

[0034] Irradiate 0.5% Pd / TiO under the condition of dose rate 50Gy / s and irradiation dose 100kGy 2 -Al 2 o 3 Catalyst preparation

[0035] a) On a rotary evaporator, 16.02 grams of aluminum isopropoxide was hydrolyzed at 90° C. for 4 hours with deionized water, dilute nitric acid was added to form a transparent sol, and then 8.52 grams of tetrabutyl titanate was added to make TiO 2 and Al 2 o 3 The mass ratio is 2:8, stirred for 6 hours to form a gel;

[0036] b) Aging the gel obtained in step a) for 24 hours at room temperature, drying at 120°C for 10 hours, and finally roasting in a muffle furnace at 450°C for 8 hours to obtain TiO 2 -Al 2 o 3 ;

[0037] c) get the TiO obtained in step b) 2 -Al 2 o 3 In the three-necked flask, add 4.7ml of 0.1mol / L PdCl 2 Solution, 9.4×10 -3 mol polyvinylpyrrolidone (PVP) and 4.7×10 -3 mol polyethylene glycol solution and mix, pass through N 2 With protective gas and circulating condensed water, the temperature was gradually r...

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Abstract

The invention relates to a method for enhancing catalytic denitrification activity of a material by electron-beam irradiation modification and application thereof, belonging to the technical field of catalytic materials. The method comprises the following steps: by using titanium aluminum composite oxides as a support and palladium as an active component, adding the palladium by a polyethyleneglycol reduction process, and carrying out irradiation treatment on the catalyst obtained by reduction, thereby obtaining the irradiation-modified catalyst, wherein the titanium aluminum composite oxides are prepared by a sol-gel process. The catalyst is in the nanosheet structure by irradiation modification, thereby obviously widening the catalytic reaction temperature window, and enhancing the NOx removal property on the palladium catalyst. The preparation method is simple in technique and convenient to operate. The modified catalyst has favorable denitrification property and favorable application prospects.

Description

technical field [0001] The invention relates to an electron beam modified palladium catalyst, its preparation and a method for using the catalyst to catalyze and remove nitrogen oxides under oxygen-enriched conditions. The invention belongs to the technical field of catalytic material preparation and air pollution control. Background technique [0002] Since nitrogen oxides can cause pollution problems such as acid rain and photochemical smog, NO x The emission control of carbon dioxide has attracted increasing attention, among which selective catalytic reduction (Selective Catalytic Reduction, SCR) is the NO x an effective means of control. use NH 3 When used as a reducing agent, the low-temperature activity (<300°C) of the traditional vanadium-tungsten-titanium catalyst needs to be improved; in addition, the toxicity of vanadium and the leakage of ammonia also limit the ability of NH 3 - Application of SCRs. When hydrogen is used as reducing agent, NO x It can be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01J37/34B01D53/86B01D53/56
CPCB01D53/8628B01D2251/202B01D2258/06B01J23/002B01J23/44B01J37/344B01J2523/00B01J2523/47B01J2523/31
Inventor 马玲玲罗敏徐殿斗
Owner INST OF HIGH ENERGY PHYSICS CHINESE ACAD OF SCI
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