CHA type aluminum-silicon molecular sieve and preparation method and application of SCR catalyst

A technology of silica-alumina molecular sieve and molecular sieve, which is applied in the direction of molecular sieve catalyst, molecular sieve and base exchange compound, separation method, etc., and can solve the problem of low activity

Pending Publication Date: 2020-11-03
CHINA CATALYST HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the SCR catalyst using synthetic molecular sieves loaded with iron and copper in the prior art to be active at low tempe

Method used

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  • CHA type aluminum-silicon molecular sieve and preparation method and application of SCR catalyst
  • CHA type aluminum-silicon molecular sieve and preparation method and application of SCR catalyst
  • CHA type aluminum-silicon molecular sieve and preparation method and application of SCR catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] A kind of preparation method of CHA type SSZ-13 molecular sieve and SCR catalyst:

[0067] 1) 79.78g HY molecular sieve (silicon aluminum ratio nSiO 2 / nAl 2 o 3 =5.20, dry basis 78.1%), 37.23g NaOH sheet alkali, 122.56g deionized water after fully dissolving and dispersing, obtain the slurry component molar ratio is nNa 2 O:nSiO 2 :nAl 2 o 3 :nH 2 O=0.60:1:0.1923:10, aged in a crystallization kettle at 90°C for 24 hours to obtain a silica-alumina gel;

[0068] 2) Add 441.10g of silica gel solution (Na 2 O: 0.24wt%, SiO 2 : 30.36wt%), 512.07g N,N-ethyl-N'-methylbicyclo[2.2.2]octyl ammonium hydroxide (concentration 20wt%, represented by OSDA), 21.25g NaCl and 493.45g deionized Sufficient water and ultrasonic stirring to mix evenly, so that the molar ratio of the mixed slurry components is nNa 2 O:nSiO 2 :nA1 2 o 3 :nOH-:nOSDA:nNaCl:nH 2 O=0.15:1:0.0370:0.12:0.08:40; add 5% HCl solution to adjust nOH in the system - / nSiO 2 Ratio = 0.42, then add SiO in th...

Embodiment 2

[0073] The process method of synthesizing CHA type SSZ-13 molecular sieve is similar to embodiment 1, and difference is the slurry component molar ratio (nNa 2 O:nSiO 2 :nAl 2 o 3 :nH 2 (0), zeolite molecular sieve type, zeolite molecular sieve silicon-alumina ratio, aging temperature and aging time, step 2) in the molar ratio of the mixed sol, the type of organic template agent, the type of silicon source, the amount of seed crystals added, the type of acid added, Metal salt M type, crystallization temperature and crystallization time, etc., step 4) take 50.0g of H-type SSZ-13 molecular sieve, adopt different soluble metal salt types, concentrations, solution volumes and metal loadings, and step 5) take 40.0g copper modified CHA type SSZ-13 molecular sieve, and 20.0g silica sol (SiO 2 content: 30.0wt%) and 57.65g of deionized water were evenly mixed to make a catalyst slurry with a solid content of 39.1wt%, which was coated on the cordierite structured material by dipping...

Embodiment 3

[0075]The process method of synthesizing CHA type SSZ-13 molecular sieve is similar to embodiment 1, and difference is the slurry component molar ratio (nNa 2 O:nSiO 2 :nAl 2 o 3 :nH 2 (0), zeolite molecular sieve type, zeolite molecular sieve silicon-alumina ratio, aging temperature and aging time, step 2) in the molar ratio of the mixed sol, the type of organic template agent, the type of silicon source, the amount of seed crystals added, the type of acid added, Metal salt M type, crystallization temperature and crystallization time, etc., step 4) take 50.0g of H-type SSZ-13 molecular sieve, adopt different soluble metal salt types, concentrations, solution volumes and metal loadings, and step 5) take 40g copper modified CHA type SSZ-13 molecular sieve, and 20.0g silica sol (SiO 2 content: 30.0 wt%) and 80.67 g of deionized water were evenly mixed to make a catalyst slurry with a solid content of 32.7 wt%, which was coated on the cordierite structured material by dipping...

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Abstract

The invention discloses a CHA type aluminum-silicon molecular sieve and a preparation method and application of an SCR catalyst, and belongs to the field of chemical synthesis technology and application thereof. The CHA type aluminosilicate zeolite molecular sieve is synthesized by adopting an N,N,N-trialkylbicyclo[2.2.2]octylammonium compound as an organic template agent, wherein the molar ratiorange of silicon dioxide to aluminum oxide in the product is 6-80, the average grain diameter is less than or equal to 500 nm, the total specific surface area is more than or equal to 400m2/g, the total pore volume is more than or equal to 0.20 ml/g, the micropore volume is not less than 0.10 ml/g, and the grain diameter in the crystal face (-210) direction of the molecular sieve is 50-160 nm. After hydrothermal treatment of the molecular sieve at 600-800 DEG C, the tetra-coordinated aluminum accounts for more than or equal to 90% of the total aluminum amount, and the hexa-coordinated aluminumaccounts for less than or equal to 10% of the total aluminum amount. The molecular sieve provided by the invention has high hydrothermal stability without large crystal grains, shows high nitrogen oxide reduction characteristics, and especially shows a catalyst with high nitrogen oxide reduction characteristics in a temperature range of 200-550 DEG C.

Description

technical field [0001] The invention relates to a preparation method and application of a CHA-type aluminum-silicon molecular sieve and an SCR catalyst, and belongs to the field of chemical synthesis technology and its application. Background technique [0002] The silica-alumina zeolite molecular sieve is a CHA-type topological structure with a three-dimensional pore structure and orthogonal symmetry. The one-dimensional main channel is composed of double eight-membered rings, the pore size is 0.38nm×0.38nm, and the skeleton density is 14.5. The topological structure of CHA molecular sieve is composed of double 6 rings (d6r) connected by 4-membered rings to form a large cha cage. The d6r crystal plane faces the cha large cage. Cu ions can be stabilized in d6r at high temperature, allowing Cu ions to migrate. It is also the unique physical and chemical characteristics of small-pore molecular sieves with SCR reaction potential. In the literature (J.Phys.Chem.C 2010,114,1633-...

Claims

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Application Information

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IPC IPC(8): B01J29/76C01B39/02C01B39/48B01D53/86B01D53/56B01D53/94
CPCB01J29/763C01B39/48C01B39/026B01D53/8628B01D53/9413C01P2002/72C01P2004/03C01P2006/12C01P2006/14C01P2004/62B01D2251/2062B01D2251/2067B01J2229/186Y02T10/12
Inventor 王志光李进王炳春柳海涛李小龙
Owner CHINA CATALYST HLDG CO LTD
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