CHA chabazite molecular sieve synthesis method and denitration catalysis application

A technology of zeolite molecular sieve and synthesis method, which is applied in the direction of molecular sieve catalyst, separation method, chemical instrument and method, etc., can solve the problem of low activity, achieve the effect of overcoming limitations, good hydrothermal stability, and broad application prospects

Active Publication Date: 2022-04-05
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 with high activity and preparation method thereof

Method used

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  • CHA chabazite molecular sieve synthesis method and denitration catalysis application
  • CHA chabazite molecular sieve synthesis method and denitration catalysis application
  • CHA chabazite molecular sieve synthesis method and denitration catalysis application

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Experimental program
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Effect test

Embodiment 1

[0067] A kind of CHA type SSZ-13 molecular sieve and catalyst preparation method:

[0068] 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 is 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;

[0069] 2) Add 507.51g of silica gel solution (Na 2 O: 0.24wt%, SiO 2 : 30.36wt%), 227.30g N,N,N-dimethylethylcyclohexyl ammonium hydroxide (concentration 20wt%, represented by OSDA1, CAS: 105197-93-1), 14.61gN'-cyclohexyl-N -Piperidinium methyl hydroxide (concentration 25wt%, represented by OSDA2, CAS: 772278-85-0), 56.31g NaOH caustic soda and 183.53g deionized water are fully mixed with ultrasonic stirring, and 5% HCl solution is added to adjust nOH in the system - / nSiO 2 Ratio, so that the molar rat...

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 73.33g of deionized water were uniformly mixed to make a catalyst slurry with a solid content of 34.5wt%, which was coated on the cordierite structured material by dipping. 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 57.95g of deionized water were evenly mixed to make a catalyst slurry with a solid content of 39.0wt%, 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 CHA chabazite molecular sieve synthesis method and denitration catalysis application. According to a CHA molecular sieve product, the molar ratio range of silicon dioxide to aluminum oxide is 5-80, and the grain size is 1-5 microns; according to the BET formula, the total specific surface area is larger than or equal to 500 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 80% or more of the total amount. The CHA molecular sieve is characterized in that N, N, N-trialkyl cyclohexyl quaternary ammonium salt/alkali and N-alkyl-N '-mono/bicycloalkyl piperidinium ammonium onium salt/alkali compounds are used as composite template agents. 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 a compound template agent composed of N,N,N-trialkylcyclohexyl quaternary ammonium salt / alkali and N-alkyl-N'-mono / bicycloalkylpiperidinium ammonium salt / alkali to synthesize CHA type Molecular sieves and catalyst preparation methods specifically relate to the synthesis of a SSZ-13 molecular sieve with a CHA topology, which is exchanged with a transition metal to form an SCR catalyst, which is applied to nitrogen oxides NOx Selective catalytic reduction reaction belongs to chemical synthesis technology and its application field. 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 pu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04B01D53/86B01D53/94B01D53/56B01D53/90B01J29/70B01J29/76
CPCY02T10/12
Inventor 王志光李进李小龙李延鑫王炳春王贤彬
Owner CHINA CATALYST HLDG CO LTD
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