Pd-based NOX adsorbent and preparation method and application thereof

An adsorbent and palladium ion technology, which is applied in the field of Pd-based NOX adsorbent and its preparation, can solve the problems of solid-state ion exchange operation difficulties, low Pd ion exchange rate, unfavorable large-scale production, etc., and solve the problem of excessive NOX emissions , Improve hydrothermal stability and reduce synthesis cost

Pending Publication Date: 2020-04-10
安徽纳蓝环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The Pd-based NO disclosed in the current literature X In the technical route of the adsorption material synthesis, there are mainly ion exchange method, equal volume impregnation method, excessive impregnation method, solid-state ion exchange method, etc. The ion exchange method will cause the Pd ion exchange rate to be too low, and most of the Pd ions will remain in the reaction solution. Among them, it causes loss, environmental pollution, and recovery is difficult; equal volume impregnation method and excessive impregnation method will cause Pd ions to agglomerate, resulting in part of Pd being oxidized to PdO, losing adsorption-desorption NO X ability; the solid-state ion exchange method is difficult to operate and is not conducive to large-scale production

Method used

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  • Pd-based NOX adsorbent and preparation method and application thereof
  • Pd-based NOX adsorbent and preparation method and application thereof
  • Pd-based NOX adsorbent and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0056] A Pd-based NO X The preparation method of adsorbent, comprises the steps:

[0057] S1. Take sodium-type zeolite molecular sieve and carry out ammonium ion exchange twice to obtain ammonium-type molecular sieve, wherein, the specific steps of ammonium ion exchange are: adding sodium-type zeolite molecular sieve into NH 4 + In an aqueous solution of ammonium chloride with a concentration of 0.5 mol / L, exchange ammonium ion at 65°C for 2 hours, then filter with suction, wash with water, and dry overnight in a blast drying oven at 80°C to obtain ammonium molecular sieves;

[0058] The framework structure of sodium zeolite molecular sieve is CHA, and its silicon-aluminum ratio is 20;

[0059] Sodium-type zeolite molecular sieves were dried in a constant temperature oven at 80°C for 12 hours, then placed in a muffle furnace, and roasted at 600°C for 12 hours in an air atmosphere;

[0060] S2. Add ammonium-type molecular sieves into the aqueous solution containing palladium...

Embodiment 2

[0065] A Pd-based NO X The preparation method of adsorbent, comprises the steps:

[0066] S1. Take sodium-type zeolite molecular sieve and carry out ammonium ion exchange twice to obtain ammonium-type molecular sieve, wherein, the specific steps of ammonium ion exchange are: adding sodium-type zeolite molecular sieve into NH 4 + In an aqueous solution of ammonium chloride with a concentration of 0.4mol / L, exchange ammonium ion at 70°C for 1.5h, then filter with suction, wash with water, and dry overnight in a blast drying oven at 80°C to obtain ammonium molecular sieves;

[0067] The framework structure of sodium zeolite molecular sieve is MFI, and its silicon-aluminum ratio is 50;

[0068] The sodium-type zeolite molecular sieve was dried in a constant temperature oven at 75°C for 14h, then placed in a muffle furnace, and roasted at 550°C for 14h in an air atmosphere;

[0069] S2. Add ammonium-type molecular sieves into the aqueous solution containing palladium ions and mi...

Embodiment 3

[0074] A Pd-based NO X The preparation method of adsorbent, comprises the steps:

[0075]S1. Take sodium-type zeolite molecular sieve and carry out ammonium ion exchange twice to obtain ammonium-type molecular sieve, wherein, the specific steps of ammonium ion exchange are: adding sodium-type zeolite molecular sieve into NH 4 + In an aqueous ammonium nitrate solution with a concentration of 0.6mol / L, exchange ammonium ions at 60°C for 2.5h, then filter with suction, wash with water, and dry overnight in a blast drying oven at 80°C to obtain ammonium molecular sieves;

[0076] The framework structure of sodium zeolite molecular sieve is BEA, and its silicon-aluminum ratio is 10;

[0077] Sodium-type zeolite molecular sieves were dried in a constant temperature oven at 85°C for 10 hours, then placed in a muffle furnace, and calcined at 650°C for 10 hours in an air atmosphere;

[0078] S2. Add ammonium-type molecular sieves into the aqueous solution containing palladium ions a...

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Abstract

The invention discloses a preparation method of a Pd-based NOX adsorbent. The preparation method comprises the following steps: S1, performing ammonium ion exchange on a zeolite molecular sieve to obtain an ammonium type molecular sieve; S2, performing palladium ion exchange on the ammonium type molecular sieve to obtain a first precursor; S3, dropwise adding an aqueous solution containing palladium ions into the first precursor, uniformly mixing, standing for dipping and drying to obtain a second precursor; and S4, roasting the second precursor and performing hydrothermal activation to obtainthe Pd-based NOX adsorbent. The invention also discloses the Pd-based NOX adsorbent which is prepared according to the preparation method of the Pd-based NOX adsorbent. The invention also discloses an application of the Pd-based NOX adsorbent in adsorption of automobile exhaust. The Pd-based NOX adsorbent prepared has the functions of efficiently and quickly adsorbing and storing NOX at low temperature and thermally desorbing NOX at high temperature and can realize harmless treatment of NOX in a cold start stage of a diesel engine.

Description

technical field [0001] The invention relates to the technical field of adsorbents, in particular to a Pd-based NO X Adsorbent and its preparation method and application. Background technique [0002] Since 2015, the problem of vehicle emissions has continued to ferment under the influence of domestic air pollution. In order to reduce exhaust pollution, my country has also accelerated the rigid requirements for exhaust emissions in recent years. In 2014, the National IV standard was introduced. On July 1, 2017, all heavy-duty diesel vehicles manufactured, imported, sold and registered in my country must meet National V standard requirements. As early as the end of 2016, the Ministry of Environmental Protection and the General Administration of Quality Supervision, Inspection and Quarantine jointly issued the "Light Vehicle Pollutant Emission Limits and Measurement Methods (China's Sixth Stage)", and the National VI standard will be divided into a and b two emission limits p...

Claims

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Application Information

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IPC IPC(8): B01J20/18B01J20/30B01D53/02
CPCB01J20/186B01J20/0225B01D53/02B01D2258/01
Inventor 王治龙李超赵长艳代瑞旗田炜
Owner 安徽纳蓝环保科技有限公司
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