Highly durable core-shell structure bea molecular sieve catalyst, preparation method and application thereof
A technology of core-shell structure and molecular sieve, which is applied in molecular sieve catalysts, separation methods, chemical instruments and methods, etc. It can solve the problems of not having the ability to resist sulfur poisoning, being unable to solve the problem of resisting sulfur poisoning, and long preparation cycle, etc., to achieve excellent ammonia gas Adsorption capacity, improvement of surface oxide enrichment, effect of inhibiting migration
Active Publication Date: 2021-10-12
CATARC AUTOMOTIVE TEST CENT TIANJIN CO LTD +1
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Problems solved by technology
But SO 2 Molecules are able to enter the core through the mesopores, contact and deactivate the Fe / BETA catalyst, which is not resistant to sulfur poisoning
[0005] The patent with publication number CN107029782A relates to a core-shell catalyst for denitrification of FCC regeneration flue gas and its preparation method, but the method steps are cumbersome, including equal-volume impregnation and ultrasonic dispersion, and the preparation cycle is long and expensive in the actual large-scale production process. can not achieve
[0006] The patent with the publication number CN105253895A relates to a Beta molecular sieve with a high content of Fe in the framework and its preparation method. This method fixes Fe in the framework structure of the molecular sieve, which greatly improves the thermal stability, but cannot solve the problem of sulfur poisoning resistance
Method used
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Effect test
Embodiment 1
[0052] Weigh 0.15 g of 2.5Fe-0.5Sm / Beta sample as the core catalyst, ultrasonically disperse it in 150ml of absolute ethanol for 3 hours, add 1g of PVP, and continue ultrasonicating for 1 hour until it is completely dissolved. Then add 0.5ml of ammonia water and continue to stir for 1 hour, adjust the pH to about 9, and finally add 1ml of tetrabutyl titanate dropwise, condense and reflux at 45°C for 12h, centrifuge, wash, dry at 60°C for 12h under vacuum, and then Calcined at 500°C for 3h, marked as: 2.5Fe-0.5Sm / Beta@TiO 2 Core-shell catalysts.
Embodiment 2
[0054] The preparation conditions and preparation process of the catalyst in this example are the same as in Example 1, except that the amount of ammonia water is 0.4 ml, and the amount of tetrabutyl titanate is 1.75 ml. The prepared core-shell catalyst is labeled as 2.5Fe-0.5Sm / Beta@TiO 2 -Δ
Embodiment 3
[0056] The preparation conditions and preparation process of the catalyst in this example are the same as in Example 1, the difference is that the selected core catalyst is 0.5Fe-2.5Sm / Beta, and a high-durability core-shell catalyst is prepared, marked as 0.5Fe-2.5Sm / Beta@TiO 2 .
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Abstract
The invention provides a high-durability core-shell structure BEA molecular sieve catalyst, a preparation method and an application thereof, including an inner core and a shell wrapped on the inner core, the inner core is a modified Sm-based BEA molecular sieve catalyst, and the material of the shell is oxidized things. The catalyst of the present invention relies on the intrinsic activity of the Sm element, and exhibits excellent ammonia adsorption capacity, low-temperature activity, temperature operating window, N 2 Selectivity and structural stability, using a highly stable oxide shell to protect the core BEA molecular sieve catalyst on the one hand to avoid a large amount of exposure to SO 2 , high-temperature water vapor, on the other hand, it inhibits the migration of active components at high temperatures, thereby improving durability.
Description
technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a highly durable core-shell structure BEA molecular sieve catalyst, a preparation method and an application thereof. Background technique [0002] The production and sales of motor vehicles in my country have ranked first in the world for 11 consecutive years, and the number of motor vehicles in 2020 has exceeded 372 million. The problem of pollutant emissions from mobile sources such as motor vehicles has become increasingly prominent. According to the "China Mobile Source Environmental Management Annual Report (2020)", the preliminary calculation of the total discharge of four pollutants from motor vehicles nationwide in 2019 was 16.038 million tons. Among them, carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NO X ), particulate matter (PM) emissions were 7.716 million tons, 1.892 million tons, 6.356 million tons, and 74,000 tons respectively...
Claims
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IPC IPC(8): B01J29/76B01J29/70B01J29/78B01D53/94B01D53/56B01D53/90B01D53/86
CPCB01J29/7615B01J29/7057B01J29/7815B01D53/9413B01D53/90B01D53/8628B01J2229/186B01D2251/2062B01D2257/404B01D2258/01B01D2258/0283B01J35/397B01J35/23
Inventor 李凯祥贾凌峰李振国刘坚王建海任晓宁邵元凯吕丛杰
Owner CATARC AUTOMOTIVE TEST CENT TIANJIN CO LTD