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A kind of off+eri structure msect-4 molecular sieve, its preparation method and application

A technology of molecular sieves and structure directing agents, which is applied in the direction of molecular sieve catalysts, molecular sieves and base exchange compounds, chemical instruments and methods, etc., can solve the problems of long synthesis period, expensive molecular sieve body and poor low temperature performance of traditional methods, and achieve excellent water quality. Effects of thermal stability, short synthesis time, and high nitrogen selectivity

Active Publication Date: 2022-07-01
CATARC AUTOMOTIVE TEST CENT TIANJIN CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention synthesizes the molecular sieve msect-4 with bone-rod-like ERI+OFF symbiotic structure with highly regular appearance, provides a corresponding rapid synthesis method, and aims to solve one of the technical problems that the traditional method has a long synthesis period; one of the technical problems to be solved is The second is the commercial molecular sieve catalyst in De-NO X Poor low temperature performance and narrow temperature window in technology;
[0005] The third technical problem to be solved is that the current commercial SCR catalyst molecular sieve is expensive

Method used

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  • A kind of off+eri structure msect-4 molecular sieve, its preparation method and application
  • A kind of off+eri structure msect-4 molecular sieve, its preparation method and application
  • A kind of off+eri structure msect-4 molecular sieve, its preparation method and application

Examples

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Embodiment 1

[0059] Weigh 3.28g NaAlO respectively 2 and 2 g of KOH were dissolved in 20 g of water, stirred for 1 h until the solution was clear, added 20 g of N,N,N-trimethyladamantanium, and continued to stir for 2 h until the solution was uniformly mixed, and the pH of the solution was greater than 11.9. Subsequently, 60 g of silica sol was added and stirring was continued for 4 hours to form a uniform sol-gel. Continue to age for 10h and then 160 ℃ constant temperature crystallization for 8h. Then it was dried and calcined at a calcination temperature of 550 °C and a constant temperature of 3 h; the prepared molecular sieve was labeled as K-msect-4. Configure 0.5M NH 4 NO 3 solution, 5 g of K-msect-4 molecular sieve was mixed with 500 ml of this solution and stirred for 12 h, repeated three times, dried and calcined at a calcination temperature of 550 °C and a constant temperature of 3 h; the prepared molecular sieve was labeled as H-msect-4.

[0060] like figure 1 , figure 2 A...

Embodiment 2

[0063] The preparation conditions and preparation process of this example are the same as those of Example 1, the difference is that a small amount of H-SSZ-13 molecular sieve is added to the uniform sol-gel as a seed crystal. like Figure 5 Shown is a photo of the microscopic morphology of the msect-4 molecular sieve product prepared in Example 2, and it can be seen that the morphology is composed of lamellar stacking.

Embodiment 3

[0065] The preparation conditions and preparation process of this example are the same as those of Example 1, except that OSDA is not added.

[0066] like Image 6 As shown in the photo of the microscopic morphology of the msect-4 molecular sieve product prepared in Example 3, it can be observed that the two ends are thick and the middle is thin, and SEM characterization shows that the product presents a regular bone rod-like morphology.

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Abstract

The invention creates and provides an OFF+ERI structure msect-4 molecular sieve, a preparation method and application thereof. Eight-membered ring small-pore molecular sieve is used as a raw material, dispersed in an aqueous phase, and caustic potash, an aluminum source and a structure guiding agent OSDA are added. , adjust pH>10, add silicon source to adjust the ratio of silicon to aluminum; after stirring reaction, aging, crystallization, filtration, washing, ammonia exchange reaction, drying, roasting. The invention creates an OFF+ERI structure msect-4 molecular sieve, a preparation method and application thereof, and has excellent hydrothermal stability, regular bone rod-shaped structure with many exposed adsorption sites and large specific surface area, and is suitable for selection It has a wide range of application prospects in the fields of catalytic reduction, passive adsorption, and catalytic cracking.

Description

technical field [0001] The invention belongs to the field of molecular sieve synthesis, in particular to an OFF+ERI structure msect-4 molecular sieve, a preparation method and application thereof. Background technique [0002] In 2020, the national vehicle nitrogen oxide (NOx) emissions reached 6.263 million tons. Among them, diesel vans are the main contributors. In addition, the impact of non-road mobile source emissions on air quality cannot be ignored. X It reached 4.782 million tons, which is close to that of motor vehicles. Selective Catalytic Reduction (SCR) technology is the most efficient NO X Eliminate technology. With the full implementation of China VI regulations for heavy-duty vehicles, NH 3 -The core catalyst of SCR (Ammonia Selective Catalytic Reduction) technology is changed from traditional vanadium-tungsten-titanium to molecular sieve catalyst. Eight-membered ring small-pore molecular sieves are the mainstream support materials for SCR catalysts in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/48B01J29/76B01J29/78B01J29/80B01J37/30
CPCC01B39/48C01B39/023B01J29/76B01J29/78B01J29/80B01J37/30B01J2229/186C01P2004/10C01P2002/72C01P2004/03
Inventor 李振国李凯祥吴志新任晓宁王建海邵元凯吴撼明张利吕诚贾凌峰
Owner CATARC AUTOMOTIVE TEST CENT TIANJIN CO LTD
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