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SSZ-13 molecular sieve for selective catalytic reduction of NOx as well as synthesis method and application of SSZ-13 molecular sieve

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

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

Method used

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  • SSZ-13 molecular sieve for selective catalytic reduction of NOx as well as synthesis method and application of SSZ-13 molecular sieve
  • SSZ-13 molecular sieve for selective catalytic reduction of NOx as well as synthesis method and application of SSZ-13 molecular sieve
  • SSZ-13 molecular sieve for selective catalytic reduction of NOx as well as synthesis method and application of SSZ-13 molecular sieve

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Experimental program
Comparison scheme
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%), 26.68gNaOH sheet alkali, 69.98g deionized water after fully dissolving and dispersing, obtain the slurry component molar ratio is 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), 21.35g 4,4-dimethyl Morpholine ammonium hydroxide (concentration 25wt%, represented by OSDA2, CAS: 38170-33-1), 56.31g NaOH caustic soda and 221.74g deionized water are fully mixed with ultrasonic stirring, and then added to 5% HCl solution to adjust the system nOH - / nSiO 2 Ratio, so that the molar ratio of the mixed slurry componen...

Embodiment 2

[0076] 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 99.17g deionized water were evenly mixed to make a catalyst slurry with a solid content of 28.9wt%, 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

[0078] 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 113.58g of deionized water were evenly mixed to make a catalyst slurry with a solid content of 26.5wt%, 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 an SSZ-13 molecular sieve for selective catalytic reduction of NOx and a synthesis method of the SSZ-13 molecular sieve, and N,N,N-trialkyl cyclohexyl quaternary ammonium salt / alkali and a dialkyl oxygen nitrogen unit cyclic ammonium onium salt / alkali compound are used for forming a double-template agent to synthesize the CHA type SSZ-13 zeolite molecular sieve. According to the SSZ-13 molecular sieve product, the molar ratio range of silicon dioxide to aluminum oxide is 8-80, 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 0.20 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 the synthesis of CHA type SSZ-13 zeolite molecular sieve and catalyst preparation by using N,N,N-trialkylcyclohexyl quaternary ammonium salt / alkali and dialkyloxynitrogen unit cyclic ammonium salt / alkali compound to form composite template agent The method specifically involves the exchange of SSZ-13 molecular sieve and transition metal to form an SCR catalyst, which is used for 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 field of catalytic purification a...

Claims

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Application Information

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IPC IPC(8): B01J29/70B01J29/74B01J29/76B01J29/78C01B39/04C01B39/48B01D53/86B01J32/00B01D53/56
CPCB01J29/7015B01J29/783B01J29/763B01J29/743B01J29/7065C01B39/48C01B39/04B01D53/8628C01P2002/72C01P2004/03B01D2258/0283B01D2251/2062B01D2251/2067B01J2229/18
Inventor 王志光王炳春李进王贤彬柳海涛李小龙
Owner CHINA CATALYST HLDG CO LTD