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Cha molecular sieve and synthesis method thereof, catalyst synthesized therewith and application

A technology of molecular sieve and alumina, which is applied in the direction of molecular sieve catalyst, catalyst activation/preparation, physical/chemical process catalyst, etc., can solve the problems of difficult biochemical treatment of wastewater, difficult recovery treatment, large reduction pollution, etc., and achieve enhanced adhesion, high nitrogen Oxide reduction properties, the effect of facilitating diffusion

Active Publication Date: 2022-07-12
CHINA CATALYST HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • Cha molecular sieve and synthesis method thereof, catalyst synthesized therewith and application
  • Cha molecular sieve and synthesis method thereof, catalyst synthesized therewith and application
  • Cha molecular sieve and synthesis method thereof, catalyst synthesized therewith and application

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preparation example Construction

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

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

Embodiment 1

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

[0098] 1) 593.72 g of silica sol (Na2O: 0.24 wt%, SiO2: 30.36 wt%) as a silicon source was added to 196.99 g of deionized water under ultrasonic stirring and mixed uniformly, and then 11.50 g of pseudo-thin water as an aluminum source was added. Bauxite (dry basis 77.0wt%) molecular sieve and 58.69g NaOH flake alkali were fully stirred to form a silica-alumina gel, and then 241.42g of N,N-dimethyl-N'-ethyl-(decahydronaphthalene-1 was added respectively. - base) ammonium hydroxide (concentration 20wt%, represented by OSDA1), 27.73g N,N,N-dimethylethylcyclohexylammonium hydroxide (concentration 25wt%, represented by OSDA2), stir well; then add 8.85 g g NaCl (99wt%) as the metal salt M was added to the solution and mixed fully and uniformly; finally, 5% HCl solution was added to adjust the nOH in the system - / nSiO 2 ratio, so that the molar ratio of the mixed slurry components is nNa 2 O:nSiO ...

Embodiment 2

[0105] The process method for synthesizing CHA type SSZ-13 molecular sieve is similar to that in Example 1, the difference is the molar ratio of the mixed sol in step 1), the types of two organic templates, the type of silicon source, the type of aluminum source, and the amount of crystal seed added. , add acid species, metal salt M species, step 2) crystallization temperature and crystallization time, etc., step 4) take 50.0 g of H-type SSZ-13 molecular sieve, use different soluble metal salt species, concentrations, solution volume and metal Loading amount, and in step 5), take 40.0g of copper-modified CHA type SSZ-13 molecular sieve, and 24.88 of silica sol (SiO 2 Content: 30.0 wt %) and 121.25 g of deionized water were mixed uniformly to prepare a catalyst slurry with a solid content of 25.5 wt %, which was coated on the cordierite regular material by dipping. The specific parameters in this embodiment are shown in Table 1, Table 2, Table 3 and Table 4. Wherein, the XRD d...

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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 of the invention, the molar ratio of silica to alumina ranges from 5 to 75, and the grain size is 0.3 ~2 μm, after the original CHA molecular sieve powder of the present invention is treated with saturated steam at a temperature of 600 to 850 ° C, the four-coordinated aluminum accounts for ≥92% of the total aluminum content, and the six-coordinated aluminum accounts for ≤8% of the total aluminum content; its synthesis The method is to use a composite organic template agent formed by a quaternary ammonium compound containing tetrahydronaphthalene or decahydronaphthalene group and a N,N,N-dimethylethylcyclohexyl quaternary ammonium compound for synthesis. The molecular sieve of the present invention has high hydrothermal stability without having a large grain diameter, and the SCR catalyst of the present invention also shows high nitrogen oxide reduction characteristics after exposure to high temperature and high humidity, especially at 200℃~ It shows high nitrogen oxide reduction characteristics in the temperature range of 550 °C.

Description

technical field [0001] The invention relates to a CHA type molecular sieve synthesized as a composite template by using tetrahydronaphthalene or decahydronaphthalene group-containing quaternary ammonium onium and N,N,N-dimethylethylcyclohexyl quaternary ammonium compound and a synthesis method thereof A catalyst synthesized with the same and its application, 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 the catalytic reduction reaction of nitrogen oxides, belonging to chemical synthesis technology and its application areas. Background technique [0002] Silica-alumina zeolite molecular sieve has a CHA-type topology with three-dimensional fine pore structure and orthogonal symmetry. The CHA molecular sieve topology is composed of double 6-rings (d6r) connected by 4-membered rings to form cha large cages. This d6r crystal face faces the cha large cag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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