CHA type molecular sieve synthesized by using quaternary ammonium onium template agent containing double cyclic groups, catalyst, preparation and application

A technology of cyclic groups and molecular sieves, which is applied in the direction of molecular sieve catalysts, catalyst activation/preparation, molecular sieves and base exchange compounds, etc., and can solve the problem of low activity

Pending Publication Date: 2020-11-20
CHINA CATALYST HLDG CO LTD
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  • 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 defect that the SCR catalyst using a copper-loaded synthetic molecular sieve in the prior

Method used

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  • CHA type molecular sieve synthesized by using quaternary ammonium onium template agent containing double cyclic groups, catalyst, preparation and application
  • CHA type molecular sieve synthesized by using quaternary ammonium onium template agent containing double cyclic groups, catalyst, preparation and application
  • CHA type molecular sieve synthesized by using quaternary ammonium onium template agent containing double cyclic groups, catalyst, preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] A kind of CHA type SSZ-13 molecular sieve and catalyst preparation method:

[0070] 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 :nOH - :nH 2 O=0.75:1.0:0.192:1.5:10, aged in a crystallization kettle at 85°C for 36 hours to obtain a silica-alumina gel;

[0071] 2) Add 507.51g of silica gel solution (Na2O: 0.24wt%, SiO2: 30.36wt%), 227.30g of N,N-dimethyl-N'-ethyl to the mixed silica-alumina gel mixture obtained in step 1). -(decalin-1-yl) ammonium hydroxide (concentration 20wt%, expressed in OSDA1), 14.61g tetramethylammonium hydroxide (concentration 25wt%, expressed in OSDA2), 56.31gNaOH sheet alkali, 21.25g NaCl and 183.53g of deionized water is fully mixed with ultrasonic stirring, so that the molar ratio of the mixed slurry components is nNa 2 O:nSi...

Embodiment 2

[0076] 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 (2), zeolite molecular sieve type, zeolite 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 g copper modified CHA type SSZ-13 molecular sieve, and 20.0g silica sol (SiO 2 content: 30.0wt%) and 91.82g deionized water were uniformly mixed to make a catalyst slurry with a solid content of 30.3wt%, which was coated on the cordierite structured material by dipping method. Spec...

Embodiment 3

[0078] 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 (2), zeolite molecular sieve type, zeolite 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, with 20.0g silica sol (SiO 2 content: 30.0wt%) and 64.66g of deionized water were evenly mixed to make a catalyst slurry with a solid content of 36.9wt%, which was coated on the cordierite structured material by dipping method. Specifi...

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Abstract

The invention discloses a CHA type molecular sieve synthesized by using a quaternary ammonium onium template agent containing double cyclic groups, a catalyst, a preparation method and an applicationof the catalyst, and belongs to the field of chemical synthesis technologies and application thereof. The CHA type zeolite molecular sieve is synthesized by forming a composite organic template agentfrom a quaternary ammonium onium compound containing double cyclic groups and alkyl substituted quaternary ammonium base. The molar ratio range of the product silicon dioxide relative to aluminum oxide is 5-80, the average grain diameter is smaller than or equal to 500 nm, the total specific surface area is larger than or equal to 400 m <2>/g, the total pore volume is larger than or equal to 0.20ml/g, the micropore pore volume is larger than or equal to 0.10 ml/g, snd the grain diameter in the crystal face (-210) direction is 50-160nm. The molecular sieve provided by the invention has high hydrothermal stability under the condition of no large grain diameter, shows high nitrogen oxide reduction characteristics after high-temperature and high-humidity exposure, and especially shows high nitrogen oxide reduction characteristics in a temperature range of 200-550 DEG C.

Description

technical field [0001] The invention relates to the preparation and application of a CHA type molecular sieve synthesized by using a bicyclic group-containing quaternary ammonium template agent and a 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 po...

Claims

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Application Information

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IPC IPC(8): C01B39/48C01B39/20C01B39/40B01J29/76B01J37/02B01J37/30B01D53/56B01D53/86B01D53/94
CPCC01B39/48C01B39/205C01B39/40B01J29/763B01J37/0215B01J37/30B01D53/8628B01D53/9413C01P2006/12C01P2004/62C01P2006/14C01P2002/72C01P2004/03B01J2229/186B01D2251/2062B01D2258/01Y02T10/12
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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