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Preparation method and application of mesoporous FeCu-ZSM-5 molecular sieve

A fecu-zsm-5, molecular sieve technology, applied in separation methods, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of blocking active sites, narrow denitration temperature window, and complicated steps, so as to alleviate the release of polluted gases, Conducive to the effect of full contact and high N2 selectivity

Pending Publication Date: 2019-02-12
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, FeCu-ZSM-5 molecular sieves are prepared by ion-exchanging the synthesized molecular sieves with Fe salts and Cu salts. Not only are the steps cumbersome, the energy consumption is high, and the denitrification temperature window is narrow (mainly low-temperature denitrification activity Poor), impregnating heteroatoms at the same time tends to cause agglomeration on the surface of molecular sieves, hinder pores, block active sites and other shortcomings that cannot be ignored

Method used

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  • Preparation method and application of mesoporous FeCu-ZSM-5 molecular sieve
  • Preparation method and application of mesoporous FeCu-ZSM-5 molecular sieve
  • Preparation method and application of mesoporous FeCu-ZSM-5 molecular sieve

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1.32 g Fe(NO 3 ) 3 9H 2 O, 0.26 g Cu(NO 3 ) 2 ·3H 2 O, 36.55 g H 2 O, 1.473 g TPABr, 14.18 g water glass (27.6 wt% SiO 2 ), 2.2 g of 2-hydroxy-propanetricarboxylic acid were added to the beaker to adjust the pH to 12, 30 o C for aging for 4 h, then add 1.2 g of 2-hydroxy-propanetricarboxylic acid to adjust the pH to 9,70 o C aging for 4 h, then transferred to a stainless steel autoclave lined with PTFE at 170 o C was crystallized for 48 h. After the crystallization was completed, the crystallized product was cooled, filtered and washed until neutral, and then placed in an oven at 120 o C was dried overnight to obtain sodium molecular sieves.

[0036] Sodium molecular sieves were mixed with 1 M NH 4 The Cl solution was ion-exchanged according to the mass ratio of 1:20, at 70 o Stir in a constant temperature water bath at C for 4 h, filter, wash, and dry at 520 o After C was calcined for 5 h, the hydrogen-type FeCu-ZSM-5 molecular sieve was obtained, which was...

Embodiment 2

[0038] This embodiment provides a FeCu-ZSM-5 catalyst, the preparation steps are the same as in Embodiment 1, only some parameters are adjusted, as follows:

[0039] Molecular sieve preparation: 2.18 g Fe(NO 3 ) 3 9H 2 O, 0.13 g Cu(NO 3 ) 2 ·3H 2 O, 10 g H 2 O, 5.20 g cetyltrimethylammonium bromide, 1.069 g sodium aluminate, 14.18 g water glass (27.6 wt% SiO 2 ), 2.2 g H 2 SO 4 Add to the beaker to adjust the pH to 11, 40 o C for 2 h, then add 1.2 g of sulfuric acid to adjust the pH to 8,80 o C aging for 4 h, and then transferred to a stainless steel autoclave lined with PTFE at 160 o C was crystallized for 24 h. After the crystallization was completed, the crystallized product was cooled, filtered and washed until neutral, and then placed in an oven at 120 o C was dried overnight to obtain sodium molecular sieves.

[0040] Sodium molecular sieves were mixed with 1 M NH 4 The Cl solution was ion-exchanged according to the mass ratio of 1:20, at 70 o Stir in a con...

Embodiment 3

[0042] This embodiment provides a FeCu-ZSM-5 catalyst, the preparation steps are the same as in Embodiment 1, only some parameters are adjusted, as follows:

[0043] Molecular sieve preparation: 5.2 g Fe(NO 3 ) 3 9H 2 O, 0.11 g Cu(NO 3 ) 2 ·3H 2 O, 18.3 g H 2 O, 8.67 gTPABr, 2.27 g aluminum sulfate, 14.18 g water glass (27.6 wt% SiO 2 ), 2.2 g H 2 SO 4 Add to the beaker to adjust the pH to 13, 50 o C aging for 5 h, then adding 3.2 g of sulfuric acid to adjust the pH to 7, 60 o C aging for 6 h, then transferred to a stainless steel autoclave with a Teflon liner at 170 o C was crystallized for 48 h. After the crystallization was completed, the crystallized product was cooled, filtered and washed until neutral, and then placed in an oven at 90 o C was dried overnight to obtain sodium molecular sieves.

[0044] Sodium molecular sieves were mixed with 1 M NH 4 The Cl solution was ion-exchanged according to the mass ratio of 1:15, at 70 o Stir in a constant temperature...

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Abstract

The invention belongs to the technical field of green preparation of environmental-friendly catalysts, discloses a preparation method and application of a mesoporous FeCu-ZSM-5 molecular sieve, and particularly relates to a method for synthesizing the mesoporous FeCu-ZSM-5 molecular sieve through a one-pot method, and the application of the mesoporous FeCu-ZSM-5 molecular sieve in selective catalytic reduction (SCR) denitration reaction. Two times of roasting carried out after demoulding and ion exchange are firstly combined into one, namely, through exchanging and one-time roasting the synthesized raw powder, the FeCu-ZSM-5 molecular sieve with the characteristics of wide temperature window, low cost, good hydrothermal stability, high SCR denitration activity and the like can be directlyprepared, the defects of complicated steps, high cost and high pollutant discharge of a traditional dipping or ion exchange method are overcome, and during the synthesis process, no meso(large)poroustemplate agent is used, and no post-treatment method is adopted to construct a mesopore, so that the method provided by the invention not only has the advantages of simple process, simplicity and convenience in operation and the like, and has favorable economic and environment benefits.

Description

technical field [0001] The invention belongs to the field of environmental protection catalysts, and in particular relates to a preparation method of a mesoporous FeCu-ZSM-5 molecular sieve and its application in selective catalytic reduction of nitrogen oxides. Background technique [0002] At present, nitrogen oxides have become important air pollutants next to inhalable particulate matter and sulfur dioxide, mainly from catalytic cracking (FCC) flue gas, automobile exhaust and thermal power plant exhaust emissions. NH in recent years 3 -SCR denitrification technology has gradually become the focus of research, and is considered by many experts and scholars to be the most potential denitrification technology. Molecular sieves have the characteristics of regular and orderly structure, adjustable skeleton composition, high specific surface area, adsorption capacity and cation exchangeability, good channel shape selectivity, excellent thermal stability and chemical stability...

Claims

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Application Information

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IPC IPC(8): B01J29/46B01J20/18B01J20/30B01D53/90B01D53/56
CPCB01D53/8628B01D53/90B01J20/06B01J20/18B01J29/46B01D2257/404B01J2220/4806B01J2220/42C01B39/40Y02C20/10B01J6/001B01J37/04B01J37/06F01N3/0842F01N3/2066F01N2370/04B01J29/041B01J29/042B01J29/044B01J2229/186B01J29/88B01J2229/37B01J2229/183B01J37/10F01N2570/145F01N2570/14B01D2258/012B01D2257/40B01D2258/01B01D2255/50B01D2257/402B01D2255/504B01D2255/20761B01D2255/20738B01J35/60B01J35/647
Inventor 岳源源刘奔吕南癸鲍晓军刘杰王廷海袁珮朱海波白正帅崔勍焱
Owner FUZHOU UNIV
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