CHA type chabazite molecular sieve and synthesis method and application thereof

A synthetic method and technology of molecular sieves, applied in the direction of molecular sieves and base exchange compounds, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problem of low activity

Active Publication Date: 2020-11-20
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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  • CHA type chabazite molecular sieve and synthesis method and application thereof
  • CHA type chabazite molecular sieve and synthesis method and application thereof
  • CHA type chabazite molecular sieve and synthesis method and application thereof

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Experimental program
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Effect test

Embodiment 1

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

[0067] 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, aging in a crystallization kettle at 95°C for 24 hours to obtain a silica-alumina gel;

[0068] 2) Add 507.51g of silica gel solution (Na 2 O: 0.24wt%, SiO 2 : 30.36wt%), 217.53g N,N-ethyl-N'-methylphenyl ammonium hydroxide (concentration 20wt%, represented by OSDA), 56.31g NaOH caustic soda, 21.25g NaCl and 202.31g 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=0.35:1.0:0.0286:0.08:0.12:15; add 5% HCl solution to adjust nOH in the system - / nSiO 2 Ratio = 0.78, then add SiO ...

Embodiment 2

[0073] The processing method of synthesizing chabazite 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-aluminum 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, and acid type , metal ion salt M type, crystallization temperature and crystallization time, get H type SSZ-13 molecular sieve 50.0g in step 4), adopt the loading capacity of different soluble metal ion salt types, concentration, solution volume and metal, and step 5 ) in 40.0g copper-modified chabazite SSZ-13 molecular sieve, and 20.0g silica sol (SiO 2 content: 30.0 wt%) and 71.4 g of deionized water were uniformly mixed to prepare a catalyst slurry with a solid content of 35.0 wt%, which was coated on the cordierite structured material by dipping...

Embodiment 3

[0075] The processing method of synthesizing chabazite 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-aluminum 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, and acid type , metal ion salt M type, crystallization temperature and crystallization time, get H type SSZ-13 molecular sieve 50.0g in step 4), adopt the loading capacity of different soluble metal ion salt types, concentration, solution volume and metal, and step 5 ) in 40g copper-modified chabazite SSZ-13 molecular sieve, and 20.0g silica sol (SiO 2 content: 30.0wt%) and 85.6g of deionized water were evenly mixed to make a catalyst slurry with a solid content of 31.6wt%, which was coated on the cordierite structured material by dipping method. The...

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Abstract

The invention discloses a CHA type chabazite molecular sieve and a synthesis method and application thereof, and belongs to the field of chemical synthesis technology and application thereof. The CHAtype chabazite molecular sieve is synthesized from N, N, N-trialkyl-N-phenyl quaternary ammonium salt or quaternary ammonium base compound as an organic template agent. The molar ratio of silicon dioxide to aluminum oxide of the CHA type chabazite molecular sieve ranges from 5 to 80, wherein the average grain diameter is less than or equal to 500 nm. The BET method determines that the total specific surface area is greater than or equal to 400 m <2> / g, the total pore volume is greater than or equal to 0.20 ml / g, the micropore pore volume is greater than or equal to 0.10 ml / g, and the grain diameter in the crystal face (-210) direction 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 characteristics after 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 CHA-type chabazite molecular sieve and its synthesis method and application, belonging to the field of chemical synthesis technology and its application. Background technique [0002] Chabazite molecular sieve is a CHA-type topological structure with 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 2010,114,1633-1640), the dehydrated Cu-SSZ-13 molecular sieve...

Claims

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Application Information

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IPC IPC(8): C01B39/48B01J29/76B82Y30/00B82Y40/00
CPCB01J29/763B01J2229/18B82Y30/00B82Y40/00C01B39/48C01P2002/72C01P2004/03C01P2004/62C01P2004/64C01P2006/12C01P2006/14
Inventor 王志光李进王炳春柳海涛王贤彬
Owner CHINA CATALYST HLDG CO LTD
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