Novel CHA molecular sieve synthesis method and preparation of SCR catalyst thereof

A synthesis method and molecular sieve technology, applied in molecular sieve catalysts, separation methods, physical/chemical process catalysts, etc., can solve the problems of low activity and achieve the effects of overcoming limitations, good hydrothermal stability, and broad application prospects

Pending Publication Date: 2022-02-01
CHINA CATALYST HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] 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 art has a low activity at low temperature after the hydrothermal durability test, and to provide a , copper-based SCR catalyst still having high activity at low temperature and preparation method thereof

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  • Novel CHA molecular sieve synthesis method and preparation of SCR catalyst thereof
  • Novel CHA molecular sieve synthesis method and preparation of SCR catalyst thereof
  • Novel CHA molecular sieve synthesis method and preparation of SCR catalyst thereof

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Experimental program
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Effect test

Embodiment 1

[0068] A kind of CHA type SSZ-13 molecular sieve and catalyst preparation method:

[0069]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 at 85°C for 36 hours to obtain a silica-alumina gel;

[0070] 2) Add 507.51g of silica gel solution (Na 2 O: 0.24wt%, SiO 2 : 30.36wt%), 173.23g N,N,N-dimethylethylcyclohexyl ammonium hydroxide (concentration 20wt%, represented by OSDA1, CAS: 105197-93-1), 25.21gN-methyl-N' -Ethyl-2-azabicyclo[2,2,1]heptane ammonium hydroxide (concentration 25wt%, represented by OSDA2, CAS: 801148-51-6), 56.31g NaOH caustic soda and 218.84g deionized water Thoroughly and ultrasonically stir to mix evenly, add 5% HCl solution to adjust the nOH in the system - / nSiO 2 Ratio, making the mixed slurry co...

Embodiment 2

[0075] The process method of synthesizing CHA type SSZ-13 molecular sieve is similar to embodiment 1, difference is step 1) and step 2) in the mol ratio of mixed sol, the kind of organic template agent, the kind of silicon source, the kind of transcrystalline zeolite and Silicon-aluminum ratio, crystallization temperature and crystallization time, etc., step 3) take 50.0g of H-type SSZ-13 molecular sieve, adopt different soluble metal salt types, concentrations, solution volumes and metal loadings, and take 40.0g in step 4) g copper modified CHA type SSZ-13 molecular sieve, and 20.0g silica sol (SiO 2 content: 30.0wt%) and 66.72g deionized water were evenly mixed to make a catalyst slurry with a solid content of 36.3wt%, which was coated on the cordierite structured material by dipping method. Specific parameters in this embodiment are shown in Table 1, Table 2, Table 3 and Table 4.

Embodiment 3

[0077] The process method of synthesizing CHA type SSZ-13 molecular sieve is similar to embodiment 1, difference is step 1) and step 2) in the mol ratio of mixed sol, the kind of organic template agent, the kind of silicon source, the kind of transcrystalline zeolite and Silicon-aluminum ratio, crystallization temperature and crystallization time, etc., step 3) take 50.0g of H-type SSZ-13 molecular sieve, adopt different soluble metal salt types, concentrations, solution volumes and metal loadings, and take 40g in step 4) Copper modified CHA type SSZ-13 molecular sieve, with 20.0g silica sol (SiO 2 content: 30.0wt%) and 74.90g of deionized water were evenly mixed to make a catalyst slurry with a solid content of 34.1wt%, which was coated on the cordierite structured material by dipping method. Specific parameters in this embodiment are shown in Table 1, Table 2, Table 3 and Table 4.

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Abstract

The invention discloses a novel CHA molecular sieve synthesis method and preparation of an SCR catalyst, and is characterized in that the CHA molecular sieve synthesis is characterized in that N,N,N-trialkyl cyclohexyl quaternary ammonium salt / alkali and a compound containing several alkyl groups and azabicyclo quaternary ammonium onium salt / alkali are used as a composite template agent; the molar ratio range of silicon dioxide to aluminum oxide of the CHA molecular sieve product is 5-80, and the grain size is 1-5 [mu]m; according to the BET formula, the total specific surface area is larger than or equal to 520 m<2> / g, the total pore volume is larger than or equal to 0.25 ml / g, and the micropore volume is larger than or equal to 0.12 ml / g; the content of adjacent paired Al of the CHA molecular sieve skeleton accounts for more than 80% of the total amount, and the CHA molecular sieve has obvious characteristic peaks at 330 + / -2cm<-1> and 465 + / -5cm<-1 > through ultraviolet-Raman spectrum analysis. The CHA molecular sieve and copper are subjected to ion exchange to form an SCR catalyst, the SCR catalyst has good denitration catalytic reaction activity, high-temperature hydrothermal stability and good sulfur poisoning resistance, and the defects that in the prior art, after a CHA molecular sieve copper-loaded SCR catalyst is subjected to hydrothermal treatment, the low-temperature light-off activity is poor, and sulfur poisoning is prone to occurring are overcome.

Description

technical field [0001] The present invention relates to use N,N,N-trialkylcyclohexyl quaternary ammonium salt / alkali and containing alkyl and azabicyclic quaternary ammonium salt / alkali to form composite template agent to synthesize CHA type molecular sieve and catalyst preparation method, specifically relate to A SSZ-13 molecular sieve with a CHA topology is synthesized, which is exchanged with a transition metal to form an SCR catalyst, which is applied to the selective catalytic reduction reaction of nitrogen oxides NOx, and belongs to the field of chemical synthesis technology and its application. Background technique [0002] With the process of global industrialization, NOx produced by stationary pollution sources (such as thermal power generation) and mobile air pollution sources is considered to be a major air pollutant. As laws and regulations around the world become increasingly strict, controlling NOx emissions has become an urgent problem to be solved in the fiel...

Claims

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Application Information

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IPC IPC(8): B01J29/76B01D53/86B01D53/56
CPCB01J29/763B01D53/8628
Inventor 王志光李进王炳春王贤彬柳海涛李小龙
Owner CHINA CATALYST HLDG CO LTD
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