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Preparation method of simultaneous desulfurization and denitrification Al2O3@TiO2 core-shell structure adsorbent

A core-shell structure, desulfurization and denitrification technology, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of poor removal effect, achieve good effect, simple synthesis method, and large adsorption capacity

Active Publication Date: 2018-06-19
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when using traditional adsorbents for simultaneous desulfurization and denitrification, SO 2 and NO x There is a competitive adsorption among them. Scholars at home and abroad have found that SO 2 The presence of will inhibit NO x The adsorption of NO x The presence of will promote SO 2 The adsorption, which results in when SO 2 and NO x When exist at the same time, NO x The removal effect is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] a) Mix 10mL tetrabutyl titanate, 30mL absolute ethanol, and 5mL acetic acid to obtain solution A; mix 3mL water and 20mL absolute ethanol to obtain solution B, and use concentrated nitric acid to adjust the pH value of A and B solutions to 3 ;

[0019] b) Grind 2.5g of activated alumina to nano-scale powder, then stir and disperse it into solution B by ultrasonic, then add solution B dropwise to solution A at 30°C under rapid stirring, and continue stirring for 40 minutes , get sol;

[0020] c) Let the sol stand for 10 hours to obtain a gel, then dry the gel at 110°C for 10 hours, then bake it in a muffle furnace at 450°C for 6 hours to obtain Al 2 o 3 @TiO 2 Core-shell structure adsorbent;

[0021] The adsorption capacity of the adsorbent for simultaneous desulfurization and denitrification is respectively SO 2 : 0.3148mmol / g; NO x : 0.1587 mmol / g.

Embodiment 2

[0023] a) Mix 15mL tetrabutyl titanate, 45mL absolute ethanol, and 7.5mL acetic acid in a certain volume ratio to obtain solution A; mix 5mL water and 25mL absolute ethanol to obtain solution B, and use concentrated nitric acid to adjust A and B solutions pH to 4;

[0024] b) Grind 2.0g of activated alumina to nano-scale powder, then stir and disperse it into solution B by ultrasonic, then add solution B dropwise to solution A at 50°C under rapid stirring, and continue stirring for 45 minutes , get sol;

[0025] c) Let the sol stand for 11 hours to obtain a gel, then dry the gel at 100°C for 11 hours, then bake it in a muffle furnace at 500°C for 4 hours to obtain Al 2 o 3 @TiO 2 Core-shell structure adsorbent;

[0026] The adsorption capacity of the adsorbent for simultaneous desulfurization and denitrification is respectively SO 2 : 0.3069mmol / g; NO x : 0.1601 mmol / g.

Embodiment 3

[0028] a) Mix 12mL tetrabutyl titanate, 36mL absolute ethanol, and 6mL acetic acid in a certain volume ratio to obtain solution A; mix 4mL water and 25mL absolute ethanol to obtain solution B, and use concentrated nitric acid to adjust the concentration of A and B solutions pH to 3.5;

[0029] b) Grind 2.3g of activated alumina to nano-scale powder, then stir and disperse it into solution B by ultrasound, then add solution B dropwise to solution A at 50°C under rapid stirring, and continue stirring for 60 minutes , get sol;

[0030] c) Let the sol stand for 11 hours to obtain a gel, then dry the gel at 120°C for 12 hours, and then bake it in a muffle furnace at 550°C for 6 hours to obtain Al 2 o 3 @TiO 2 Core-shell structure adsorbent;

[0031] The adsorption capacity of the adsorbent for simultaneous desulfurization and denitrification is respectively SO 2 : 0.2953mmol / g; NO x : 0.1543 mmol / g.

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Abstract

The invention relates to a preparation method of simultaneous desulfurization and denitrification Al2O3@TiO2 core-shell structure adsorbent, belonging to the field of environmental protection. the simultaneous desulfurization and denitrification Al2O3@TiO2 core-shell structure adsorbent is prepared by using mesoporous activated aluminum oxide as a core and anatase titanium dioxide as a shell, grinding a certain amount of aluminum oxide into nanoparticles, dispersing the nanoparticles in ethanol by ultrasonication, stirring, and the like, and adding the ethanol into a titanium dioxide preparation sol. When being used in a simultaneous desulfurization and denitrification process, the simultaneous desulfurization and denitrification Al2O3@TiO2 core-shell structure adsorbent is found that thespecial structure of the simultaneous desulfurization and denitrification Al2O3@TiO2 core-shell structure adsorbent can effectively weaken the competitive adsorption of SO2 and NOx, and improves the simultaneous desulfurization and denitration performance. The simultaneous desulfurization and denitrification Al2O3@TiO2 core-shell structure adsorbent prepared by the method has stable properties andlarge adsorption capacity, can reduce the competitive adsorption of the SO2 and the NOx, achieves simultaneous desulfurization and denitrification, and has good economic, environmental and social benefits.

Description

technical field [0001] The invention belongs to the technical field of materials and environmental protection, and in particular relates to a preparation method of a core-shell adsorbent for simultaneous desulfurization and denitrification. Background technique [0002] National SO 2 and NO x Emissions have declined to varying degrees every year, but there are still relatively high emissions, and the production and supply of electricity and heat are still SO 2 and NO x main source of . The goal of overall improvement in air quality still needs to be further strengthened in thermal power and other industries. 2 and NO x emission reduction work. [0003] At present, the most commonly used desulfurization and denitrification technologies in industry are calcium-based wet desulfurization technology (WFGD) and selective catalytic reduction denitrification technology (SCR) with ammonia as reducing agent, but these processes are operated separately. In recent years, the coor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/08B01J20/30B01D53/02
CPCB01D53/02B01D2257/302B01D2257/404B01J20/06B01J20/08B01J2220/42B01J2220/4806B01J2220/4812
Inventor 易红宏杨昆唐晓龙黄永海解锡舟时屹然
Owner UNIV OF SCI & TECH BEIJING
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