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A small-pore molecular sieve-loaded bimetal material for removing nitrogen oxides from diesel vehicle exhaust at low temperature, its preparation method and application

A nitrogen oxide and molecular sieve technology, applied in separation methods, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problem of no Chinese name, and achieve the effect of inhibiting agglomeration, improving NOx removal efficiency, and improving high temperature water resistance.

Active Publication Date: 2022-03-25
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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  • A small-pore molecular sieve-loaded bimetal material for removing nitrogen oxides from diesel vehicle exhaust at low temperature, its preparation method and application
  • A small-pore molecular sieve-loaded bimetal material for removing nitrogen oxides from diesel vehicle exhaust at low temperature, its preparation method and application
  • A small-pore molecular sieve-loaded bimetal material for removing nitrogen oxides from diesel vehicle exhaust at low temperature, its preparation method and application

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 and place it in a tube furnace, calcined at 520 °C for 12 h under dry air conditions; add 20 g of ammonium sulfate to an appropriate amount of water (the solution concentration is 8 mol) / L, solution volume 250mL), stir for a few minutes under ultrasonic conditions until the ammonium nitrate is completely dissolved; weigh 40g of H-SSZ-13 molecular sieves after high temperature calcination and add them to the above-mentioned ammonium sulfate solution, then the mixed solution is moved to magnetic stirring The mixture was stirred at room temperature for 2.5 h (800 r / min), and 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...

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, calcined at 520 ℃ for 12h under dry air conditions; add 20g of ammonium sulfate to an appropriate amount of water (solution concentration is 8 mol / L, solution volume 250mL), stir for several minutes under ultrasonic conditions until ammonium nitrate is completely dissolved; weigh 40g of H-SSZ-13 molecular sieves after high-temperature calcination and add them to the above-mentioned ammonium sulfate solution, then move the mixed solution to a magnetic stirrer The mixture was stirred at room temperature for 2.5 h (800 r / min), and 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 (impregnation met...

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PUM

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Abstract

The invention discloses a small-pore molecular sieve-loaded bimetallic material for removing nitrogen oxides from diesel vehicle tail gas at low temperature, a preparation method and application thereof. The method is: (1) pretreatment of commercial small-pore molecular sieve H‑SSZ‑13; (2) preparing Pd-based single-component molecular sieve by uniformly loading Pd component on the surface of the treated molecular sieve by means of ion exchange or impregnation (3) The second component Ce was doped into the Pd‑SSZ‑13 system by means of ion exchange to prepare a bimetallic supported molecular sieve PNA system. The method of the present invention can not only provide more NO x Adsorption site, enhance the PNA system for NO at low temperature x adsorption efficiency, and can effectively improve the anti-poisoning ability of the molecular sieve PNA system, so it can effectively realize NO x It can be widely used in the field of air pollution control.

Description

technical field [0001] The invention relates to the preparation of a small-pore molecular sieve supported Pd and Ce bimetallic material (PdCe-SSZ-13) and its removal of nitrogen oxides (NO x ), belonging 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, and its massive emission can lead to serious urban haze pollution problems, as well as major environmental pollution events such as acid rain and photochemical smog. Moreover, NO x It will cause serious damage to the ozone layer, and it is also the main gas that forms the greenhouse effect. NO in the atmosphere x There are two main sources: on the one hand, it is produced by nature itself and discharged into the environment, including the nitrogen-fixing process of nitrogen-fixing bacteria and the natural lightning process; on the other hand, it is produced...

Claims

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Application Information

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Patent Type & Authority Patents(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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