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Preparation of Mn-Ce-Sb/hierarchical porous ZSM-5 catalyst and low-temperature denitration application thereof

A technology of ZSM-5 and mn-ce-sb, which is applied in the field of molecular sieve catalysis, can solve the problems of single pore and poor catalytic performance of ordinary molecular sieves, so as to improve NOx removal rate, improve anti-SO2 poisoning performance, and improve low-temperature denitrification catalysis The effect of efficiency and sulfur resistance performance

Inactive Publication Date: 2021-12-10
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Description
  • Claims
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Problems solved by technology

[0006] In order to solve the above-mentioned defects existing in the prior art, the object of the present invention is to provide a kind of preparation of Mn-Ce-Sb / hierarchical channel ZSM-5 catalyst and its application in low temperature denitrification, by adding microporous template structure The directing agent organosilane TPOAC effectively introduces uniform multi-level channels, and Mn, Ce, and Sb are loaded on the multi-level channel molecular sieve by impregnation method, which solves the problem of single channel and poor catalytic performance of ordinary molecular sieves

Method used

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  • Preparation of Mn-Ce-Sb/hierarchical porous ZSM-5 catalyst and low-temperature denitration application thereof
  • Preparation of Mn-Ce-Sb/hierarchical porous ZSM-5 catalyst and low-temperature denitration application thereof
  • Preparation of Mn-Ce-Sb/hierarchical porous ZSM-5 catalyst and low-temperature denitration application thereof

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preparation example Construction

[0039] The preparation method of a Mn-Ce-Sb / hierarchical channel ZSM-5 catalyst provided by the embodiment of the present invention comprises the following steps:

[0040] A. Synthesis of multi-level channel ZSM-5 molecular sieve

[0041] Step 1, according to the volume ratio (4-20): 1, add organosilane TPOAC to the microporous template solution, and stir to obtain solution A; the mass concentration of the microporous template solution is 50%;

[0042] Wherein, the microporous template agent is any one of tetrapropylammonium hydroxide (TPAOH), n-butylamine or ethylenediamine. Organosilanes were used as structure-directing agents, using dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride (TPOAC).

[0043] Step 2, according to the volume ratio (420-520): 1:280, add NaOH to the solution A, then add the silicon source dropwise, and stir to obtain a uniform mixed solution B;

[0044] Wherein, the silicon source adopts any one of tetraethyl orthosilicate (TEOS), silica g...

Embodiment 1

[0057] The multi-level channel ZSM-5 molecular sieve was prepared by the soft template method and used as the carrier, and the Mn metal element was used as the active component, and the Mn element was loaded on the multi-level channel ZSM-5 molecular sieve by the impregnation method, wherein the mass fraction of Mn 20%.

[0058] A, deionized water is added in tetrapropyl ammonium hydroxide (TPAOH), configuration mass concentration is 50% microporous template solution, according to volume ratio 20: 1 microporous template solution tetrapropylammonium hydroxide (TPAOH) Add organosilane TPOAC to TPAOH) to obtain solution A, stir at room temperature for 20min, then add NaOH to solution A according to the volume ratio of 500:1:280, then add tetraethyl orthosilicate (TEOS) dropwise, stir at room temperature for 1h to obtain a uniform mixture Solution B; then add sodium metaaluminate NaAlO according to the volume ratio of 150:1 2 , stirred at room temperature for 30 minutes until the...

Embodiment 2

[0061] Hierarchical channel ZSM-5 molecular sieves were prepared by soft template method as carrier. Using Mn and Ce metal elements as active components, the Mn and Ce metal elements are supported on the multi-stage pore ZSM-5 molecular sieve by impregnation method, wherein the loading ratio of Mn and Ce is 0.85:0.15, and the mass of (Mn+Ce) The score is 20%.

[0062] A. Add deionized water to n-butylamine, configure a microporous template solution with a mass concentration of 50%, and add organosilane TPOAC to the microporous template n-butylamine solution according to the volume ratio of 18:1 to obtain solution A, at room temperature Stir for 20 minutes, then add NaOH to solution A according to the volume ratio of 520:1:280, then add silica gel drop by drop, stir at room temperature for 1 hour to obtain a uniform mixture B; then add aluminum isopropoxide according to the volume ratio of 145:1, Stir for 30 minutes until the aluminum is completely dissolved, then move to a re...

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Abstract

The invention discloses preparation and low-temperature denitration application of a Mn-Ce-Sb / hierarchical porous ZSM-5 catalyst, wherein a hierarchical porous ZSM-5 molecular sieve is prepared by a soft template method, and Mn, Ce and Sb are loaded by an impregnation method to synthesize the Mn-Ce-Sb / hierarchical porous ZSM-5 catalyst so as to improve the low-temperature denitration performance and the sulfur resistance of the Mn-Ce-Sb / hierarchical porous ZSM-5 catalyst. The hierarchical porous ZSM-5 molecular sieve has a developed porous structure, combines adjustable acidity and good hydrothermal stability of a microporous molecular sieve and excellent mass transfer and diffusion performance of a mesoporous material, is simple to prepare and has good repeatability. The hierarchical porous ZSM-5 molecular sieve catalyst prepared by the method shows good low-temperature denitration performance and sulfur resistance.

Description

technical field [0001] The invention belongs to the technical field of molecular sieve catalysis, in particular to the preparation of a Mn-Ce-Sb / hierarchical pore ZSM-5 catalyst and its application in low-temperature denitrification. Background technique [0002] NO x As a type of pollutant, it will generate photochemical smog (which can irritate the eyes of organisms, and can cause the decline of plant tissue function, resulting in a decrease in crop yield), aggravating smog weather, acid rain, destroying the ozone layer in the upper air, and exacerbating global climate warming, or form PM 2.5 main precursor. In addition to these environmental hazards, it will also cause irreversible harm to organisms. For example, NO can strongly stimulate the human respiratory system. After inhalation, it will corrode and stimulate lung tissue, causing pulmonary edema, chest tightness, Symptoms such as respiratory distress can even be life-threatening when severe. NO x It is one of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/48B01D53/86B01D53/56
CPCB01J29/48B01D53/8628B01J2229/186
Inventor 闫东杰李娟潘永宝玉亚
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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