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Adsorbent for passive adsorption of nitrogen oxides and its preparation method and use

A technology for passive adsorption and nitrogen oxides, applied in chemical instruments and methods, alkali metal oxides/hydroxides, separation methods, etc., can solve problems such as unspecified hydrothermal stability, and achieve easy industrial application, adsorption Effects of performance improvement and simple preparation method

Active Publication Date: 2022-04-08
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above scheme does not give how to obtain an adsorbent with both high hydrothermal stability and high low-temperature passive adsorption performance of nitrogen oxides;

Method used

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  • Adsorbent for passive adsorption of nitrogen oxides and its preparation method and use
  • Adsorbent for passive adsorption of nitrogen oxides and its preparation method and use
  • Adsorbent for passive adsorption of nitrogen oxides and its preparation method and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The adsorbent of the present invention uses H-AEI molecular sieve as a carrier, noble metal Pd as an active component, and the load of Pd element in the adsorbent is 1.0wt% based on the mass of the carrier as 100%;

[0048] The preparation method of the adsorbent: the carrier is placed in a mortar, a certain concentration of palladium nitrate solution is added dropwise on the carrier, and it is fully ground in the mortar before the liquid phase appears; it is transferred to an oven for drying overnight , followed by roasting at 500° C. for 6 h to obtain the adsorbent, the loading of Pd is 1.0 wt %, and the adsorbent is recorded as 1.0 Pd-AEI.

Embodiment 2

[0050] In this example, the adsorbent prepared in Example 1 was used as a raw material, and the adsorbent was subjected to hydrothermal aging treatment. The temperature of the hydrothermal aging treatment was 750° C., and the time of the hydrothermal aging treatment was 16 hours.

[0051] Among them, the atmosphere of hydrothermal aging treatment is containing 10vol% H 2 O's air.

Embodiment 3

[0053] In this example, the adsorbent prepared in Example 1 was used as a raw material, and the adsorbent was subjected to hydrothermal aging treatment. The temperature of the hydrothermal aging treatment was 800° C., and the time of the hydrothermal aging treatment was 16 hours.

[0054] Among them, the atmosphere of hydrothermal aging treatment is containing 10vol% H 2 O's air.

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Abstract

The present invention relates to an adsorbent for passive adsorption of nitrogen oxides and its preparation method and application. The adsorbent includes a carrier and an active component, the carrier includes AEI molecular sieve, and the active component includes noble metal elements. The noble metal element is selected from Pt and / or Pd; the adsorbent is used for passive adsorption of low-temperature nitrogen oxides, which has a high adsorption capacity for nitrogen oxides, and the adsorbent has high hydrothermal stability, After mild hydrothermal aging treatment, its passive adsorption performance for nitrogen oxides was significantly improved. After deep hydrothermal aging treatment, it can still maintain a high adsorption capacity of nitrogen oxides. When the adsorbent is used for mobile source exhaust gas purification, it has a suitable nitrogen oxide desorption temperature and can be used as a mobile source for low-temperature nitrogen oxidation. Requirements for adsorbents for waste emissions.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to an adsorbent for passive adsorption of nitrogen oxides, a preparation method and application thereof. Background technique [0002] Nitrogen oxides are one of the main pollutants in the atmosphere. They are toxic to the human body, damage plants, form acid rain and acid fog, and form photochemical smog with hydrocarbons. At the same time, they can promote SO in the atmosphere. 2 Therefore, it is necessary to effectively purify nitrogen oxides before they are discharged into the atmosphere. Passive adsorption of nitrogen oxides is one of the important methods for low-temperature removal of nitrogen oxides , especially for the cold start stage of the motor vehicle, when the Selective Catalytic Reduction (SCR) catalyst cannot effectively remove nitrogen oxides due to the low temperature, the passive adsorption of nitrogen oxides can effectively reduce the emission of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/16B01J20/28B01J20/30B01D53/04
CPCB01J20/16B01J20/0225B01J20/28095B01J20/3078B01D53/04B01D2257/404
Inventor 贺泓单玉龙余运波石晓燕孙宇
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI