Nanosheet self-assembled SAPO-34 molecular sieve and preparation method thereof

A SAPO-34, self-assembly technology, applied in the chemical field, can solve problems such as complex processes, and achieve the effects of high acid content, large specific surface area, and uniform particle size

Active Publication Date: 2015-05-27
VALIANT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The SAPO-34 molecular sieves with special morphology (generally speaking, the SAPO-34 molecular sieve has a cubic shape) prepared by the above disclosed technology are mostly spherical, microspherical and sheet-like, and the process is relative

Method used

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  • Nanosheet self-assembled SAPO-34 molecular sieve and preparation method thereof
  • Nanosheet self-assembled SAPO-34 molecular sieve and preparation method thereof
  • Nanosheet self-assembled SAPO-34 molecular sieve and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 284.4g of aluminum isopropoxide (Al 2 o 3 content is 26.3%) into 786g deionized water, add 414.5g morpholine and 40.8gTMAmOH (TMAmOH content is 25%), stir for 5h, add 70.6g ethyl orthosilicate (SiO 2 Content is 40%), 183.0g orthophosphoric acid (H 3 PO 4 content is 85%) and 68.3g of n-hexane, stirred for 3h to obtain a gel, transferred the gel to a crystallization kettle, and crystallized at 185°C for 48h to obtain a mixed solution, filtered the mixed solution to obtain a filter cake, and washed the filter cake until The pH value of the filtrate was less than 8, dried at 80-120°C for 8 hours, programmed to heat up to 550°C at a heating rate of 3°C / min, and roasted for 6 hours to obtain the target product, which was named A. After XRD and SEM characterization tests, it is found that the product A prepared under this condition has a typical CHA type diffraction peak of SAPO-34, such as figure 1 As shown, the SEM picture shows that the product is a spherical particle f...

Embodiment 2

[0040] 284.4g of aluminum isopropoxide (Al 2 o 3 Content is 26.3%) into 768.3g deionized water, add 345.6g morpholine and 30.6gTMAmOH (TMAmOH content is 25%), stir for 5h, add 70.6g ethyl orthosilicate (SiO 2 Content is 40%), 183.0g orthophosphoric acid (H 3 PO 4content is 85%), stirred for 3 hours to obtain a gel, transferred the gel to a crystallization kettle, and crystallized at 195°C for 48 hours to obtain a mixed solution, filtered the mixed solution to obtain a filter cake, washed the filter cake until the pH value of the filtrate was less than 8. Dry at 80-120°C for 8 hours, program the temperature up to 550°C at a heating rate of 3°C / min, and roast for 6 hours to obtain the target product, named B. After XRD and SEM characterization tests, it is found that the product B prepared under this condition has a typical CHA type diffraction peak of SAPO-34, such as image 3 As shown, the SEM picture shows that the product is a spherical particle formed by the self-assemb...

Embodiment 3

[0042] 284.4g of aluminum isopropoxide (Al 2 o 3 Content is 26.3%) into 809.0g deionized water, add 276.4g morpholine and 27.2gTMAmOH (TMAmOH content is 25%), stir for 3h, add 70.6g ethyl orthosilicate (SiO 2 Content is 40%), 183.0g orthophosphoric acid (H 3 PO 4 content is 85%) and 76.2g of toluene, stirred for 1h to obtain a gel, transferred the gel to a crystallization kettle, and crystallized at 165°C for 24h to obtain a mixed solution, filtered the mixed solution to obtain a filter cake, washed the filter cake to the filtrate The pH value is less than 8, dried at 80-120°C for 8 hours, programmed to heat up to 600°C at a heating rate of 3°C / min, and roasted for 5 hours to obtain the target product, named C. After XRD and SEM characterization tests, it was found that the product C prepared under this condition had a typical CHA type diffraction peak of SAPO-34, such as Figure 5 As shown, the SEM picture shows that the product is a spherical particle formed by the self-...

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Abstract

The invention relates to a nanosheet self-assembled SAPO-34 molecular sieve and a preparation method thereof. According to the nanosheet self-assembled SAPO-34 molecular sieve, nanosheets with the average thickness of 10-100nm are adopted to form the SAPO-34 molecular sieve with the granular size of 0.5-7mu m through self-assembling, the molecular sieve takes the shape of a sphere, a sphere-like body, a cube, a cube-like body or a spindle in morphology. The molecular sieve is accordant in structure and good in dispersity. The preparation method is simple and easy to operate, the prepared SAPO-34 molecular sieve material is large in specific surface and high in acid content, can be used in catalysis processes such as low-carbon olefin (MTO) preparation through methanol conversion and automobile tail gas treatment, and has potential industrial development prospect.

Description

technical field [0001] The invention relates to a nanosheet self-assembled SAPO-34 molecular sieve and a preparation method thereof, belonging to the field of chemistry. Background technique [0002] SAPO-34 molecular sieve is one of the series of microporous SAPO silicoaluminophosphate molecular sieves. It was developed by Union Carbide Corporation (UCC) in 1984. It has a microporous structure similar to that of CHA. It is used in catalytic methanol production. When olefin (MTO) reacts, its medium-strength acid center is conducive to the generation of C1-C5 hydrocarbons, and its eight-membered ring opening is not conducive to the diffusion of macromolecules. Only C1-C3 can easily diffuse out of the crystal. For low-carbon Olefin selectivity is as high as 90%. Therefore, SAPO-34 molecular sieve has become the preferred catalyst for methanol-to-olefins (MTO) technology in the world, and has been well applied in industry. [0003] Judging from the current research results, t...

Claims

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Application Information

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IPC IPC(8): C01B37/08C01B39/54B82Y30/00
Inventor 张文于成龙周振垒权禄波葛立权王志刚
Owner VALIANT CO LTD
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