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Microporous molecular sieve loaded bimetallic material for removing nitrogen oxide in diesel vehicle tail gas at low temperature, preparation method and application thereof

A technology for nitrogen oxides and diesel vehicles, applied in the direction of separation methods, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of no Chinese names, achieve the effects of inhibiting agglomeration, improving adsorption efficiency, and improving high temperature and water resistance

Active Publication Date: 2020-11-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The system shows excellent low temperature removal of NO x At present, there is no formal Chinese name for this kind of material, and its English name is passive NO x absorber, abbreviated as PNA

Method used

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  • Microporous molecular sieve loaded bimetallic material for removing nitrogen oxide in diesel vehicle tail gas at low temperature, preparation method and application thereof
  • Microporous molecular sieve loaded bimetallic material for removing nitrogen oxide in diesel vehicle tail gas at low temperature, preparation method and application thereof
  • Microporous molecular sieve loaded bimetallic material for removing nitrogen oxide in diesel vehicle tail gas at low temperature, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) NH 4 - Preparation of SSZ-13 catalyst

[0036] (1-1) Weigh 5~20g of commercial H-SSZ-13, place it in a tube furnace, and calcinate it in dry air at 520°C for 12 h for later use; add 20 g of ammonium sulfate to an appropriate amount of water (the solution concentration is 8 mol / L, solution volume 250mL), stirred for several minutes under ultrasonic conditions until ammonium nitrate was completely dissolved; weighed 40g of H-SSZ-13 molecular sieve calcined at high temperature and added to the above ammonium sulfate solution, then moved the mixed solution to magnetic stirring Stirring on the mixer at room temperature for 2.5 h (800 r / min), the stirred mixture was filtered to obtain a white solid, which was washed several times with deionized water. After repeating the above process 3 times, the obtained white solid was placed in an oven and dried at 160 °C for 20 h to obtain NH 4 -SSZ-13.

[0037] (1-2) The preparation method of Pd-SSZ-13 (ion exchange method) is o...

Embodiment 2

[0044] (1) NH 4 - Preparation of SSZ-13 catalyst

[0045] (1-1) Weigh 5~20g of commercial H-SSZ-13 and place it in a tube furnace, and calcinate it for 12 h under dry air conditions at 520 °C for later use; add 20 g of ammonium sulfate to an appropriate amount of water (the solution concentration is 8 mol / L, solution volume 250mL), stirred for several minutes under ultrasonic conditions until ammonium nitrate was completely dissolved; weighed 40g of H-SSZ-13 molecular sieve calcined at high temperature and added to the above ammonium sulfate solution, then moved the mixed solution to magnetic stirring Stirring on the mixer at room temperature for 2.5 h (800 r / min), the stirred mixture was filtered to obtain a white solid, which was washed several times with deionized water. After repeating the above process 3 times, the obtained white solid was placed in an oven and dried at 160 °C for 20 h to obtain NH 4 -SSZ-13.

[0046] (1-2) The preparation method of Pd-SSZ-13 (dipping...

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Abstract

The invention discloses a microporous molecular sieve loaded bimetallic material for removing nitrogen oxides in diesel vehicle tail gas at low temperature, a preparation method and application thereof. The method comprises the following steps: (1) pre-treating a commercial small-pore molecular sieve H-SSZ-13; (2) uniformly loading a Pd component on the surface of the treated molecular sieve in anion exchange or impregnation manner to prepare a Pd-based single-component molecular sieve system; and (3) doping a second component Ce into the Pd-SSZ-13 system by using an ion exchange means to prepare the bimetallic supported molecular sieve PNA system. According to the method, more NOx adsorption sites can be provided, the NOx adsorption efficiency of the PNA system at a low temperature can be improved, and the poisoning resistance of the molecular sieve type PNA system can be effectively improved, so that efficient removal of NOx at a low temperature can be effectively realized, and themethod can be widely applied to the field of atmospheric pollution treatment.

Description

technical field [0001] The invention relates to the preparation of a small-pore molecular sieve loaded Pd and Ce bimetallic material (PdCe-SSZ-13) and its removal of nitrogen oxides (NO x ) and belongs to the technical field of thermocatalytic materials. Background technique [0002] As we all know, NO x It is an important precursor for the formation of fine particulate matter (PM2.5) in the atmospheric environment. Its large-scale emission can lead to serious urban haze pollution problems, as well as major environmental pollution events such as acid rain and photochemical smog. And, NO x It will cause serious damage to the ozone layer, and it is also the main gas that forms the greenhouse effect. Atmospheric NO x There are two main sources of nitrogen: on the one hand, it is produced by nature itself and discharged into the environment, including the nitrogen fixation process of nitrogen-fixing bacteria and the natural lightning process; on the other hand, it is produce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/74B01J37/02B01J37/30B01D53/94B01D53/56
CPCB01J29/743B01J37/0201B01J37/30B01D53/9413B01D2258/01B01J2229/186B01J2229/20
Inventor 陈培榕陈冬冬付名利叶代启
Owner SOUTH CHINA UNIV OF TECH
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