Hierarchical pore nanometer SAPO-34 molecular sieve, preparation method and applications thereof

A SAPO-34, molecular sieve technology, applied in the field of catalysis, can solve the problems of limited application scope, and achieve the effect of improving conversion rate and selectivity, maintaining stability, and prolonging single-pass life.

Active Publication Date: 2019-12-20
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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  • Hierarchical pore nanometer SAPO-34 molecular sieve, preparation method and applications thereof
  • Hierarchical pore nanometer SAPO-34 molecular sieve, preparation method and applications thereof
  • Hierarchical pore nanometer SAPO-34 molecular sieve, preparation method and applications thereof

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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 hierarchical pore nanometer SAPO-34 molecular sieve, a preparation method and applications thereof, and relates to the field of catalysis, wherein the hierarchical pore nanometer SAPO-34 molecular sieve is a nanometer flaky molecular sieve with a thickness of 10-100 nm, an average particle size of 300-1000 nm, a micropore size of 0.38-0.5 nm, a mesopore size of 2-30 nm, aspecific surface area of 400-600 m<2>/g, and a pore volume of 0.3-0.6 cm<3>/g. According to the present invention, the hierarchical pore nanometer SAPO-34 molecular sieve is obtained through co-treatment with HF and NH4F; and with the application of the hierarchical pore nanometer SAPO-34 molecular sieve in MTO reactions, the selectivity of low-carbon olefins can be improved, the content of C5<+>is low, and the one-way service life of the catalyst is prolonged.

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 Applications(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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