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Cu/SAPO-34@meso-TiO2 catalytic material with core-shell structure, and preparation method and application thereof

A technology of SAPO-34 and catalytic materials, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems affecting the service life of new Cu molecular sieve catalysts, material deactivation, etc.

Inactive Publication Date: 2020-01-03
SHAOXING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although my country has used national IV or even national V diesel oil (with low sulfur content), there will still be a large amount of sulfate deposition in long-term operation to deactivate the material, so sulfur poisoning is still the main factor affecting the service life of the new Cu molecular sieve catalyst

Method used

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  • Cu/SAPO-34@meso-TiO2 catalytic material with core-shell structure, and preparation method and application thereof
  • Cu/SAPO-34@meso-TiO2 catalytic material with core-shell structure, and preparation method and application thereof
  • Cu/SAPO-34@meso-TiO2 catalytic material with core-shell structure, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) First, H-SAPO-34 is added to the solution mass fraction of 25% NH 4 NO 3 solution and mixed evenly, the mass ratio of solid to liquid is 1:8, ion exchange at 80°C for 2h under high-speed magnetic stirring. Then the mixture was washed with deionized water until neutral, and dried at 100 °C for 12 h. Repeat the above process for the second ion exchange to obtain NH 4+ - SAPO-34 carrier material. Then, the NH 4+- Add SAPO-34 to a copper acetate solution with a mass fraction of 0.5% and mix evenly. The mass ratio of solid to liquid is 1:8, and perform ion exchange at 60°C for 4 hours under high-speed magnetic stirring. Then the mixture was washed with deionized water until neutral, dried at 100°C for 12h, and then calcined at 550°C for 4h to obtain Cu / SAPO-34 molecular sieve by liquid phase ion exchange method. P in the obtained Cu / SAPO-34 molecular sieve 2 o 5 、Al 2 o 3 , SiO 2 The mass ratio is 25:21:4, and the Cu content is 1% of the total mass of Cu / SAPO-3...

Embodiment 2

[0028] (1) First, H-SAPO-34 is added to the solution mass fraction of 25% NH 4 NO 3 solution and mixed evenly, the mass ratio of solid to liquid is 1:8, ion exchange at 80°C for 2h under high-speed magnetic stirring. Then the mixture was washed with deionized water until neutral, and dried at 100 °C for 12 h. Repeat the above process for the second ion exchange to obtain NH 4+ - SAPO-34 carrier material. Then, the NH 4+ -Add SAPO-34 into copper acetate solution with a mass fraction of 2% and mix evenly. The mass ratio of solid to liquid is 1:8, and perform ion exchange at 60°C for 4 hours under high-speed magnetic stirring. Then the mixture was washed with deionized water until neutral, dried at 100°C for 12h, and then calcined at 550°C for 4h to obtain Cu / SAPO-34 molecular sieve by liquid phase ion exchange method. P in the obtained Cu / SAPO-34 molecular sieve 2 o 5 、Al 2 o 3 , SiO 2 The mass ratio is 25:21:4, and the Cu content is 5% of the total mass of Cu / SAPO-34 ...

Embodiment 3

[0032] (1) The Cu / SAPO-34 molecular sieve prepared in Example 2 is added to the mixed solution of tetrahydrofuran and dimethylformamide, the volume ratio of tetrahydrofuran and dimethylformamide is 6:1, Cu / SAPO-34 molecular sieve and The solid-to-liquid mass ratio of the mixed solution was 1:500, and ultrasonically oscillated for 2 hours to obtain a suspension. Subsequently, the tetrahydrofuran solution dissolved with tetrabutyl titanate, silica gel and tungstic acid was added dropwise into the above-mentioned suspension under stirring, wherein the total volume of the three substances of tetrabutyl titanate, silica gel and tungstic acid was equal to The volume ratio of tetrahydrofuran is 1:10, the mass ratio of tetrabutyl titanate, silica gel and tungstic acid is 3.6:0.3:0.1, and the mass ratio of tetrabutyl titanate and Cu / SAPO-34 molecular sieve is 1:125, step by step A precipitate formed. After the precipitation was complete, stirring was continued for 2 h, and H 2 Mixtur...

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Abstract

The invention discloses a Cu / SAPO-34@meso-TiO2 catalytic material with a core-shell structure, and a preparation method and an application thereof. The catalytic material is formed by coating the surface of a Cu / SAPO-34 molecular sieve with a meso-TiO2 shell, the meso-TiO2 shell is composed of TiO2, WO3 and SiO2, TiO2 accounts for 0.5-2% of the total mass of the catalytic material, WO3 accounts for 3-10% of the total mass of the meso-TiO2 shell, and SiO2 accounts for 3-6% of the total mass of the meso-TiO2 shell. The preparation method comprises the following steps: preparing the Cu / SAPO-34 molecular sieve, and coating the Cu / SAPO-34 molecular sieve with the meso-TiO2 shell to obtain the catalytic material. The catalytic material is applied to an NH3-SCR denitration reaction, and has a good denitration performance and a good sulfur resistance.

Description

technical field [0001] The invention relates to a catalytic material, in particular to a core-shell structure Cu / SAPO-34@meso-TiO 2 Catalytic materials and their preparation methods and applications. Background technique [0002] Haze weather has brought great harm to people's physical and mental health. According to expert argumentation, 31.1% of smog comes from vehicle exhaust emissions, of which strong oxidizing nitrogen oxides (NO x ) is the main factor causing the secondary particle explosion. Proven: NH 3 -SCR system is to control diesel vehicle exhaust NO x The best technology, the principle is to use NH 3 selectively NO x Catalytic reduction to harmless N 2 . With the introduction of more stringent emission regulations (National VI), SCR catalysts are required to have high denitrification rate and high N in the range of 150-550 °C 2 Selective, and at the same time, it has the performance of resisting long-term hydrothermal aging at 750°C and sulfur aging for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85B01J35/02B01J35/10B01D53/94B01D53/56F01N3/20B01J35/00
CPCB01J29/85B01D53/9418F01N3/2066B01J2229/18B01D2251/2062B01J35/396B01J35/40B01J35/617Y02T10/12
Inventor 刘雪松
Owner SHAOXING UNIVERSITY
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