CHA molecular sieve synthesized by novel structure template agent and SCR catalyst and application thereof

A technology of SCR catalyst and new structure, applied in molecular sieve catalyst, molecular sieve and base exchange compound, physical/chemical process catalyst, 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

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

Method used

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  • CHA molecular sieve synthesized by novel structure template agent and SCR catalyst and application thereof
  • CHA molecular sieve synthesized by novel structure template agent and SCR catalyst and application thereof
  • CHA molecular sieve synthesized by novel structure template agent and SCR catalyst and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] A kind of preparation method of CHA type SSZ-13 molecular sieve and SCR catalyst:

[0066] 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;

[0067] 2) Add 507.51g of silica gel solution (Na 2 O: 0.24wt%, SiO 2 : 30.36wt%), 265.61g N,N-diethyl-N'-methyl-(indan-4-yl) ammonium hydroxide (concentration 20wt%, represented by OSDA), 56.31g NaOH caustic soda, 21.25 g NaCl and 163.85g deionized water are fully mixed with ultrasonic stirring, 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 the system - / nSiO 2 Ratio = 0.78, the...

Embodiment 2

[0072] 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, and step 2) in the molar ratio of the mixed slurry components, the type of organic template, the type of silicon source, the amount of seed crystals added, the addition of 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) Get 40.0g copper-modified CHA type SSZ-13 molecular sieve, and 20.0g silica sol (SiO 2 content: 30.0wt%) and 76.50g of deionized water were evenly mixed to make a catalyst slurry with a solid content of 33.7wt%, which was coated on the cordierite structured material by di...

Embodiment 3

[0074]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, and step 2) in the molar ratio of the mixed slurry components, the type of organic template, the type of silicon source, the amount of seed crystals added, the addition of 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) Get 40g copper-modified CHA type SSZ-13 molecular sieve, and 20.0g silica sol (SiO 2 content: 30.0wt%) and 104.87g deionized water were evenly mixed to make a catalyst slurry with a solid content of 27.9wt%, which was coated on the cordierite structured material by dipping...

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Abstract

The invention discloses a CHA molecular sieve synthesized by a novel structure template agent and an SCR catalyst and application thereof, and belongs to the field of chemical synthesis technology andapplication thereof. The CHA molecular sieve is synthesized by adopting one or more of N,N,N-trialkyl-(indan-5-yl)quaternary ammonium onium, N,N,N-trialkyl-(indan-1-yl)quaternary ammonium onium or N,N,N-trialkyl-(indan-4-yl)quaternary ammonium onium compounds as an organic template agent, wherein the molar ratio range of silicon dioxide to aluminum oxide is 6-80, the average grain diameter is less than or equal to 500nm, the total specific surface area is greater than or equal to 400m2 / g, the total pore volume is greater than or equal to 0.20 ml / g. the micropore volume is greater than or equal to 0.10 ml / g, and the grain diameter size 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, also shows high nitrogen oxide reduction characteristics after high-temperature and high-humidity exposure, 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 CHA molecular sieve synthesized by a novel structural template agent, its SCR 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.Phys.Chem.C 2010,114,...

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王贤彬
Owner CHINA CATALYST HLDG CO LTD
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