A kind of hierarchical porous nano sapo-34 molecular sieve and its preparation method and application

A technology of SAPO-34 and molecular sieve, which is applied in the field of catalysis and can solve problems such as the limitation of application range

Active Publication Date: 2021-07-06
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the method is limited by the existing aluminum content and particle size of the silica-alumina molecular sieve, its application range is also limited

Method used

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  • A kind of hierarchical porous nano sapo-34 molecular sieve and its preparation method and application
  • A kind of hierarchical porous nano sapo-34 molecular sieve and its preparation method and application
  • A kind of hierarchical porous nano sapo-34 molecular sieve and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Weigh 3g SAPO-34 and put it in a beaker, then add 0.1g mass fraction of 40% hydrogen fluoride solution, stir at room temperature for 3min to obtain suspension A; weigh 0.2g ammonium fluoride and add it to suspension A, Stir at room temperature for 3 minutes to obtain suspension B; weigh 18g of deionized water and add it to suspension B, stir for 5 minutes to obtain suspension C; put suspension C in an ultrasonic cleaner at 25°C Ultrasound for 15 minutes to obtain suspension D; put suspension D for 1 hour and then remove the supernatant water; then put it in a centrifuge and centrifuge at a speed of 12000r / min, and centrifuge several times until the solution is neutral; then Put it into an oven at 100°C and dry it for 12 hours; place the obtained sample in dry air, raise the temperature to 550°C at a rate of 3°C / min and roast for 6 hours, shape the solid sample after roasting, and sieve to obtain 30-60 Object particles, namely the hierarchically porous nanometer SAPO-34 ...

Embodiment 2

[0030] Weigh 3g SAPO-34 and put it in a beaker, then add 0.2g hydrogen fluoride solution with a mass fraction of 40%, stir at room temperature for 3min to obtain suspension A; weigh 0.2g ammonium fluoride and add it to suspension A , stirred at room temperature for 3 minutes to obtain suspension B; weighed 18 g of deionized water and added to suspension B, stirred for 5 minutes to obtain suspension C; put suspension C in an ultrasonic cleaner at 25 ° C Ultrasound for 15 minutes to obtain suspension D; put the suspension D to stand for 1 hour and remove the supernatant water; then put it in a centrifuge and centrifuge at a speed of 12000r / min, and centrifuge several times until the solution is neutral; then Put it into an oven at 100°C and dry it for 12 hours; place the obtained sample in dry air, raise the temperature to 550°C at a rate of 3°C / min and roast for 6 hours, shape the solid sample after roasting, and sieve to obtain 30~ The 60-mesh particle is the hierarchical poro...

Embodiment 3

[0033]Weigh 3g of SAPO-34 and put it in a beaker, then add 0.3g of hydrogen fluoride solution with a mass fraction of 40%, stir at room temperature for 3min to obtain suspension A; weigh 0.2g of ammonium fluoride and add it to suspension A , stirred at room temperature for 3 minutes to obtain suspension B; weighed 18 g of deionized water and added to suspension B, stirred for 5 minutes to obtain suspension C; put suspension C in an ultrasonic cleaner at 25 ° C Ultrasound for 15 minutes to obtain suspension D; put the suspension D to stand for 1 hour and remove the supernatant water; then put it in a centrifuge and centrifuge at a speed of 12000r / min, and centrifuge several times until the solution is neutral; then Put it into an oven at 100°C and dry it for 12 hours; place the obtained sample in dry air, raise the temperature to 550°C at a rate of 3°C / min and roast for 6 hours, shape the solid sample after roasting, and sieve to obtain 30~ The 60-mesh particle is the hierarchi...

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Abstract

The invention discloses a multi-level porous nanometer SAPO-34 molecular sieve and its preparation method and application, relating to the field of catalysis. The multi-stage porous nano-SAPO-34 molecular sieve is a nano-sheet molecular sieve with a thickness of 10-100nm and an average particle size of 300-1000nm. 600m 2 / g, the pore volume is 0.3~0.6cm 3 / g. The hierarchical porous nanometer SAPO-34 molecular sieve adopts HF and NH 4 F co-processed, applied to the MTO reaction, can improve the selectivity of light olefins, while C 5 + With less content, the one-way life of the catalyst is also extended.

Description

technical field [0001] The invention relates to the field of catalysis, in particular to a multi-level porous nanometer SAPO-34 molecular sieve and its preparation method and application. Background technique [0002] SAPO-34 molecular sieve has controllable pore structure and acidity, and has suitable proton acidity and thermal stability, so it is widely used in reactions such as acid catalysis and shape-selective catalysis, such as MTO reaction, automobile exhaust purification, etc. Among them, in the MTO reaction, the conversion rate of methanol exceeds 95%, and the low carbon olefins C 2-4 ＝ The selectivity reaches more than 80%. However, due to the narrow and long pores of traditional SAPO-34 molecular sieves, the diffusion of raw materials and products on the catalyst is limited, and the phenomenon of carbon deposition is serious, so the catalyst deactivates rapidly. [0003] At present, researchers mainly use post-treatment methods such as acid and alkali to modify...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B37/08C01B39/54B82Y30/00B82Y40/00B01J29/85
CPCB01J29/85B82Y30/00B82Y40/00C01B37/08C01B39/54C01P2004/60C01P2004/64C01P2006/12C01P2006/14C01P2006/17
Inventor 康金灿邹成成刘志铭张庆红王野
Owner XIAMEN UNIV
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