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Nitrogen oxide purification CHA zeolite molecular sieve as well as preparation method and application of catalyst thereof

A technology of zeolite molecular sieves and nitrogen oxides, which can be used in molecular sieve catalysts, molecular sieves and base exchange compounds, physical/chemical process catalysts, 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 temperatures through the hydrothermal durability test. Lower defects, providing a copper-based SCR catalyst with high activity at low temperature after hydrothermal durability test and its preparation method

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  • Nitrogen oxide purification CHA zeolite molecular sieve as well as preparation method and application of catalyst thereof
  • Nitrogen oxide purification CHA zeolite molecular sieve as well as preparation method and application of catalyst thereof
  • Nitrogen oxide purification CHA zeolite molecular sieve as well as preparation method and application of catalyst thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] A preparation method of nitrogen oxide purification CHA zeolite SSZ-13 molecular sieve and SCR catalyst:

[0065] 1) 45.59g HY molecular sieve (silicon aluminum ratio nSiO 2 / nAl 2 o 3 =5.20, dry basis 78.1%), 53.69g NaOH sheet alkali, 69.71g deionized water after fully dissolving and dispersing, obtain the slurry component molar ratio to be nNa 2 O:nSiO 2 :nAl 2 o 3 :nH 2 O=1.5:1.0:0.192:10, aged in a crystallization kettle at 85°C for 36 hours to obtain a silica-alumina gel;

[0066] 2) Add 507.51g of silica gel solution (Na 2 O: 0.24wt%, SiO 2 : 30.36wt%), 514.44g N,N-diethyl-N'-methyl-4-quinuclidinyl ammonium hydroxide (concentration 20wt%, represented by OSDA), 21.25g NaCl and 235.61g deionized water Fully and ultrasonically stirred and mixed evenly, so that the molar ratio of the mixed slurry components nNa 2 O:nSiO 2 :nA1 2 o 3 :nOSDA:nNaCl:nH 2 O=0.12:1.0:0.0286:0.16:0.12:20; add 5% HCl solution to adjust the nOH in the system - / nSiO 2 Ratio = 0...

Embodiment 2

[0071] The process method of synthesizing nitrogen oxides to purify CHA zeolite 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 mixed slurry component molar ratio, silicon source type, organic template type, seed crystal addition amount, acid type, Metal salt M type, crystallization temperature and crystallization time, step 4) take H-type SSZ-13 molecular sieve 50.0g, adopt different soluble metal salt types, concentrations, solution volumes and metal loadings, and step 5) take 40.0 g copper modified CHA type SSZ-13 molecular sieve, and 20.0g silica sol (SiO 2 content: 30.0wt%) and 59.48g of deionized water were evenly mixed to make a catalyst slurry with a solid content of 38.5wt%, which was coated on the cordierite structured material by dipping method. S...

Embodiment 3

[0073]The process method of synthesizing nitrogen oxides to purify CHA zeolite 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 mixed slurry component molar ratio, silicon source type, organic template type, seed crystal addition amount, acid type, Metal salt M type, crystallization temperature and crystallization time, 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, with 20.0g silica sol (SiO 2 content: 30.0wt%) and 81.54g of deionized water were evenly mixed to make a catalyst slurry with a solid content of 32.5wt%, which was coated on the cordierite structured material by dipping method. S...

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Abstract

The invention discloses a nitrogen oxide purification CHA zeolite molecular sieve as well as a preparation method and application of a catalyst thereof, and belongs to the field of chemical synthesistechnologies and application thereof. The CHA zeolite molecular sieve is synthesized by adopting an N,N,N-trialkyl-quinuclidine-4-quaternary ammonium onium compound as an organic template agent, the molar ratio range of silicon dioxide to aluminum oxide 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 more than or equal to 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 aluminum accounts 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 after being exposed at high temperature and high humidity, 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 nitrogen oxide purifying CHA zeolite molecular sieve and a catalyst preparation method and application thereof, belonging 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 2010,11...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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 王志光李小龙李进王炳春柳海涛
Owner CHINA CATALYST HLDG CO LTD
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