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CHA molecular sieve, synthesis method thereof, catalyst synthesized by using CHA molecular sieve and application

A technology of SCR catalyst and molecular sieve, applied in molecular sieve catalyst, catalyst activation/preparation, physical/chemical process catalyst, etc., can solve the problems of high price, low utilization rate, large reduction pollution, etc.

Active Publication Date: 2021-03-02
CHINA CATALYST HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The current existing technical problems are that N,N,N-trialkyl-1-adamantyl ammonium salts and their basic compounds are usually used as templates, which are expensive, have low utilization rates and are difficult to recycle. Molecular sieve synthesis The generated waste water is difficult to biochemically treat, causing a large reduction pollution problem; therefore, template agents with low cost, easy post-treatment and strong structure-oriented ability are needed to synthesize silica-alumina zeolite molecular sieves with good thermal stability

Method used

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  • CHA molecular sieve, synthesis method thereof, catalyst synthesized by using CHA molecular sieve and application
  • CHA molecular sieve, synthesis method thereof, catalyst synthesized by using CHA molecular sieve and application
  • CHA molecular sieve, synthesis method thereof, catalyst synthesized by using CHA molecular sieve and application

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preparation example Construction

[0047] In a specific embodiment of the present invention, the present invention provides a kind of CHA molecular sieve and its synthetic method, it is characterized in that: the quaternary ammonium compound containing tetrahydronaphthalene or decahydronaphthalene group and N,N,N- The composite organic template of dimethyl ethyl cyclohexyl quaternary ammonium compound synthesizes CHA type zeolite molecular sieve, the molar ratio range of silica to alumina of the product ranges from 5 to 75, and the total specific surface area measured by BET method is 400 to 750m 2 / g, the total pore volume is 0.25~0.45ml / g, the micropore pore volume is 0.12~0.25ml / g; the molecular sieve average grain diameter≤500nm, X-ray crystal diffraction (-210) half-value width of crystal plane ( The range of FWHM) is 0.1-0.15°, and the grain diameter in the (-210) direction of the crystal plane is calculated by the Debye-Scherrer formula to be 80-160nm;

[0048] The pore structure data of molecular sieves...

Embodiment 1

[0097] A kind of preparation method of CHA type SSZ-13 molecular sieve and SCR catalyst:

[0098] 1) Add 593.72g of silica sol (Na2O: 0.24wt%, SiO2: 30.36wt%) as a silicon source to 196.99g of deionized water and mix evenly under ultrasonic stirring conditions, and then add 11.50g of pseudo-thin water as an aluminum source Alite (dry basis 77.0wt%) molecular sieves, 58.69g NaOH flake base were fully stirred to form a silica-alumina gel, and then 241.42g N,N-dimethyl-N'-ethyl-(decalin-1 - base) ammonium hydroxide (concentration 20wt%, represented by OSDA1), 27.73g N, N, N-dimethyl ethyl cyclohexyl ammonium hydroxide (concentration 25wt%, represented by OSDA2) and stir well; then add 8.85 g NaCl (99wt%) as the metal salt M is added to the solution and mixed fully; finally add 5% HCl solution to adjust the nOH in the system - / nSiO 2 Ratio, making the mixed slurry component molar ratio nNa 2 O:nSiO 2 :n A1 2 o 3 :nOH-:nOSDA1:nOSDA2:nNaCl:nH 2 O=0.25:1.0:0.0286:0.58:0.0667:...

Embodiment 2

[0105] The process method of synthesizing CHA type SSZ-13 molecular sieve is similar to embodiment 1, and difference is the molar ratio of mixed sol in step 1), two kinds of organic templating agent types, silicon source, the kind of aluminum source, seed crystal addition amount , add acid species, metal salt M species, step 2) crystallization temperature and crystallization time etc., step 4) get H type SSZ-13 molecular sieve 50.0g, adopt different soluble metal salt species, concentration, solution volume and metal Loading capacity, and step 5) get 40.0g copper-modified CHA type SSZ-13 molecular sieve, with 24.88 silica sol (SiO 2 content: 30.0wt%) and 121.25g deionized water were evenly mixed to make a catalyst slurry with a solid content of 25.5wt%, 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. Wherein, the XRD diffraction pattern of the CHA type SSZ-13 m...

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Abstract

The invention discloses a CHA molecular sieve, a synthesis method thereof, and a denitration SCR catalyst synthesized by using the CHA molecular sieve. In the CHA molecular sieve, the molar ratio of silicon dioxide to aluminum oxide ranges from 5 to 75, the grain size ranges from 0.3 micrometer to 2 micrometers, after CHA molecular sieve raw powder is subjected to saturated steam treatment at thetemperature of 600 DEG C to 850 DEG C, tetra-coordinated aluminum accounts for more than or equal to 92 percent of the total aluminum amount, and the hexa-coordinate aluminum accounts for less than orequal to 8% of the total aluminum amount. The synthesis method comprises the step of synthesizing by using a composite organic template agent formed by a quaternary ammonium onium compound containingtetrahydronaphthalene or decahydronaphthalene groups and an N, N, N-dimethyl ethyl cyclohexyl quaternary ammonium onium compound. The molecular sieve disclosed by the invention has high hydrothermalstability under the condition of not having a large grain diameter, and the SCR catalyst disclosed by the invention also shows high nitrogen oxide reduction characteristics after being exposed at hightemperature and high humidity, and particularly shows high nitrogen oxide reduction characteristics in a temperature range of 200-550 DEG C.

Description

technical field [0001] The invention relates to a CHA type molecular sieve synthesized by a composite template agent composed of a tetrahydronaphthalene or decahydronaphthalene group-containing quaternary ammonium and an N,N,N-dimethylethylcyclohexyl quaternary ammonium compound and a synthesis method thereof And the catalyst synthesized by it and its application, specifically related 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 the catalytic reduction reaction of nitrogen oxides, and belongs to chemical synthesis technology and its field of 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. T...

Claims

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Application Information

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IPC IPC(8): C01B39/04B01J37/30B01J37/02B01J29/76
CPCC01B39/04B01J29/763B01J37/024B01J37/30B01J2229/18B01J2229/42C01P2002/72C01P2006/12C01P2006/14C01P2004/62C01P2004/61C01P2002/60C01P2004/38Y02T10/12
Inventor 李进王志光柳海涛王炳春王贤彬
Owner CHINA CATALYST HLDG CO LTD
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