CHA structure molecular sieve, synthesis method, nitrogen oxide selective reduction catalyst and application

A technology of nitrogen oxides and synthesis methods, applied in the direction of molecular sieve catalysts, molecular sieves and base exchange compounds, physical/chemical process catalysts, etc., 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

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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

Method used

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  • CHA structure molecular sieve, synthesis method, nitrogen oxide selective reduction catalyst and application
  • CHA structure molecular sieve, synthesis method, nitrogen oxide selective reduction catalyst and application
  • CHA structure molecular sieve, synthesis method, nitrogen oxide selective reduction catalyst and application

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Experimental program
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Effect test

Embodiment 1

[0067] A kind of CHA structure molecular sieve and nitrogen oxide selective reduction catalyst (SCR catalyst) preparation method:

[0068] 1) 45.59g HY molecular sieve (silicon aluminum ratio nSiO 2 / nAl 2 o 3 =5.20, dry basis 78.1%), 26.68g NaOH sheet alkali, 69.98g 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=0.75:1.0:0.192:10, aged in a crystallization kettle at 85°C for 36 hours to obtain a silica-alumina gel;

[0069] 2) Add 507.51g of silica gel solution (Na 2 O: 0.24wt%, SiO 2 : 30.36wt%), 277.60g N,N-diethyl-N'-methyl-(naphthalene-1-yl) ammonium hydroxide (concentration 20wt%, represented by OSDA), 56.31g NaOH caustic soda, 21.25gNaCl Fully mix with 154.25g deionized water and ultrasonically stir, so that the molar ratio of the mixed slurry components is nNa 2 O:nSiO 2 :nA1 2 o 3 :nOSDA:nNaCl:nH 2 O=0.35:1.0:0.0286:0.08:0.12:15; add 5% HCl solution to adjust nOH in t...

Embodiment 2

[0074] The process method of synthesizing CHA structure 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, organic template type, type of silicon source, seed crystal addition amount, acid type added , metal salt M type, crystallization temperature and crystallization time, step 4) get H-type SSZ-13 molecular sieve 50.0g, adopt different soluble metal salt types, concentrations, solution volumes and metal loads, 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 103.12g of deionized water were evenly mixed to make a catalyst slurry with a solid content of 28.2wt%, which was coated on the cordierite structured material by dipping method. Specific parameters in this...

Embodiment 3

[0076] The process method of synthesizing CHA structure 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, organic template type, type of silicon source, seed crystal addition amount, acid type added , metal salt M type, crystallization temperature and crystallization time, step 4) get H-type SSZ-13 molecular sieve 50.0g, adopt different soluble metal salt types, concentrations, solution volumes and metal loads, and step 5) take 40g copper modified CHA type SSZ-13 molecular sieve, and 20.0g silica sol (SiO 2 content: 30.0wt%) and 81.98g of deionized water were evenly mixed to make a catalyst slurry with a solid content of 32.4wt%, which was coated on the cordierite structured material by dipping method. Specific parameters in this e...

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Abstract

The invention discloses a CHA structure molecular sieve and a synthesis method thereof, and a nitrogen oxide selective reduction catalyst and application thereof, and belongs to the field of chemicalsynthesis technology and application thereof. An N,N,N-trialkyl-(naphthyl-1-yl)quaternary ammonium onium compound is adopted as an organic template agent to synthesize the CHA structure molecular sieve, the molar ratio range of silicon dioxide to aluminum oxide is 6-80, the average grain diameter is smaller than or equal to 500 nm, the total specific surface area is larger than or equal to 400 m2 / g, the total pore volume is larger than or equal to 0.20 ml / g, the micropore volume is larger 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. The molecular sieve provided by the invention has high hydrothermal stability under the condition of no large crystal grains, and shows high nitrogen oxide reduction characteristicsafter being exposed at high temperature and high humidity, especially shows high nitrogen oxide reduction characteristics in a temperature range of 200-550 DEG C.

Description

technical field [0001] The invention relates to a molecular sieve with a CHA structure and a synthesis method, a nitrogen oxide selective reduction catalyst and its application, 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.P...

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 王志光李进柳海涛王炳春史振宇
Owner CHINA CATALYST HLDG CO LTD
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