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Preparation method of NOx adsorbent

A nitrogen oxide and adsorbent technology, which is applied in the field of NO adsorbent preparation to achieve the effects of high NO adsorption activity, excellent NO adsorption performance and high adsorption activity

Inactive Publication Date: 2017-06-13
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because activated carbon is prone to CO and spontaneous combustion at high temperatures, there are few studies on NO adsorbents with high activity at 200 °C.

Method used

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  • Preparation method of NOx adsorbent
  • Preparation method of NOx adsorbent
  • Preparation method of NOx adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Put 18g of coconut shell activated carbon sieved to 16-20 mesh into 30ml of 0.5mol / L HNO 3 Immerse in a medium volume of the solution, and wash it repeatedly with deionized water after 12 hours until the filtrate is neutral (pH=7); then immerse in a medium volume of 30ml of 0.3mol / L cobalt nitrate solution for 12h; put it in an oven and dry at 105°C Dry for 12 hours; then immerse in 30ml of 0.1mol / L potassium nitrate solution with an equal volume for 12 hours; put it in an oven and dry it at 105°C for 12 hours; put the obtained solid into a tubular fiber resistance furnace, and bake it at 400°C under nitrogen protection After 2 hours, it was naturally cooled to room temperature to obtain 1# adsorbent.

Embodiment 2

[0027] Put 18g of coconut shell activated carbon sieved to 16-20 mesh into 30ml of 0.5mol / L HNO 3 Immerse in a medium volume of the solution, and wash it repeatedly with deionized water after 12 hours until the filtrate is neutral (pH=7); then immerse in a medium volume of 30ml of 0.3mol / L cobalt nitrate solution for 12h; put it in an oven and dry at 105°C Dry for 12 hours; then immerse in 30ml of 0.5mol / L potassium nitrate solution with an equal volume for 12 hours; put it in an oven and dry at 105°C for 12 hours; put the obtained solid into a tubular fiber resistance furnace, and bake it at 400°C under nitrogen protection After 2 hours, it was naturally cooled to room temperature to obtain 2# adsorbent.

Embodiment 3

[0029] Put 18g of coconut shell activated carbon sieved to 16-20 mesh into 30ml of 0.5mol / L HNO 3 Immerse in a medium volume of the solution, and wash it repeatedly with deionized water after 12 hours until the filtrate is neutral (pH=7); then immerse in a medium volume of 30ml of 0.3mol / L cobalt nitrate solution for 12h; put it in an oven and dry at 105°C Dry for 12 hours; then immerse in 30ml of 0.6mol / L potassium nitrate solution with an equal volume for 12 hours; put it in an oven and dry at 105°C for 12 hours; put the solid into a tubular fiber resistance furnace, and bake it at 400°C under nitrogen protection After 2 hours, it was naturally cooled to room temperature to obtain 3# adsorbent.

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Abstract

The invention relates to a preparation method of a NOx adsorbent and belongs to the technical field of absorbents. Pore diameter distribution as well as a physical structure and chemical functional groups on the surface of activated carbon can be modified to a certain extent with a physical or chemical method. The activated carbon is pretreated with a nitric acid solution and an incipient-wetness impregnation method, and then cobalt nitrate and potassium nitrate are loaded on the surface of the activated carbon, so that the activated carbon has higher adsorption efficiency at 20-200 DEG C; compared with the conventional modified activated carbon, the activated carbon has more obvious adsorption effect, the NO adsorption capacity of the activated carbon can reach 59.0649 mg / g (in terms of NO), the efficiency is 90% or higher, and the activated carbon has good regeneration performance.

Description

[0001] Technical field: [0002] The invention relates to a preparation method of an NO adsorbent, which has high adsorption efficiency at 20°C to 200°C and good regeneration performance. It belongs to the technical field of adsorbent. Background technique [0003] Nitrogen oxides (NO x ) is the main pollutant in the atmosphere, NO x mainly composed of NO and NO 2 Composition, these harmful gases will not only cause ozone, photochemical smog and acid rain, but also damage people's health, can stimulate the lungs, cause human respiratory system, lung, liver and other diseases. The main methods of NOx control include SCR, SNCR, absorption and adsorption. Activated carbon is a commonly used adsorbent, which has the advantages of large specific surface area and pore volume, stable thermochemical properties, wide range of sources, and no secondary pollution. It has always been a hot research field. [0004] It is a hot spot in the field of activated carbon research to modify t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01D53/02B01J20/30
CPCB01J20/06B01D53/02B01D2257/40B01D2258/0283B01J20/20
Inventor 李坚李水静梁文俊
Owner BEIJING UNIV OF TECH
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