Method for synthesizing Beta molecular sieve by organic-free template

A technology without organic template and molecular sieve, applied in the field of catalytic chemistry, can solve the problems of application restriction, energy consumption, increased cost, etc., and achieve the effect of rapid synthesis and improvement of crystallization rate

Inactive Publication Date: 2008-08-27
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although it shows very superior performance in the catalytic reaction, its application is still severely restricted, because organic templates are used in the synthesis of Beta molecular sieves, which no

Method used

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  • Method for synthesizing Beta molecular sieve by organic-free template
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  • Method for synthesizing Beta molecular sieve by organic-free template

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Embodiment 1

[0028] Embodiment 1: rapid synthesis of Beta molecular sieve without template

[0029] The starting material molar ratio of Beta molecular sieve synthesis is as follows: 40.28SiO 2 / 1.00Al 2 o 3 / 10.46Na 2 O / 566.66H 2 O, where NaOH / SiO 2 =0.45,H 2 O / SiO 2 About 14. The specific synthesis process is as follows: 0.117g of NaAlO 2 and 0.36g of NaOH dissolved in 5.04ml of H 2 O, after being dissolved, 1.2g of white carbon black was added to the above solution. After stirring for about 10-15 minutes, 0.12g Beta zeolite seed crystals (provided by Sinopec, SiO 2 / Al 2 o 3 =22, SEM and XRD (as shown in Figure 1 and Figure 2) were added to the above gel, and continued to stir at room temperature for about 10-15 minutes. Afterwards, the above-mentioned gel was put into a stainless steel reactor with polytetrafluoroethylene lining, and crystallized at 140° C. for about 19 hours. After cooling, filter at room temperature and dry overnight at 80°C to obtain the product. Acco...

Embodiment 2

[0031] Embodiment 2: rapid synthesis of Beta molecular sieve without template

[0032] The starting material molar ratio of Beta molecular sieve synthesis is as follows: 40.28SiO 2 / 1.00Al 2 o 3 / 11.46Na 2 O / 566.66H 2 O, where NaOH / SiO 2 =0.50,H 2 O / SiO 2 About 14. The specific synthesis process is as follows: 0.117g of NaAlO 2 and 0.40 g of NaOH dissolved in 5.04 ml of H 2 O, after being dissolved, 1.2 g of white carbon black was added to the above solution. After stirring for about 10-15 minutes, 0.084 g of Beta zeolite seed crystals (provided by Sinopec) were added to the above gel, and stirring was continued at room temperature for about 10-15 minutes. Afterwards, the above-mentioned gel was put into a stainless steel reaction kettle with polytetrafluoroethylene lining, and crystallized at 140° C. for 19 hours. After cooling, filter at room temperature and dry overnight at 80°C to obtain the product. According to X-ray diffraction characterization, the product ...

Embodiment 3

[0033] Embodiment 3: template-free rapid synthesis of Beta molecular sieves

[0034] The starting material molar ratio of Beta molecular sieve synthesis is as follows: 40.28SiO 2 / 1.00Al 2 o 3 / 11.46Na 2 O / 526.37H 2 O, where NaOH / SiO 2 =0.50,H 2 O / SiO 2 About 13. The specific synthesis process is as follows: 0.117g of NaAlO 2 and 0.40 g of NaOH dissolved in 4.68 ml of H 2 O, after being dissolved, 1.2 g of white carbon black was added to the above solution. After stirring for about 10-15 minutes, 0.12 g of Beta zeolite seed crystals (provided by Sinopec) were added to the above gel, and stirring was continued at room temperature for about 10-15 minutes. Afterwards, the above-mentioned gel was put into a stainless steel reaction kettle with polytetrafluoroethylene lining, and crystallized at 140° C. for 19 hours. After cooling, filter at room temperature and dry overnight at 80°C to obtain the product. It is known through X-ray diffraction characterization that the ...

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Abstract

The invention relates to a method of synthesizing Beta molecular sieve without organic templates, which belongs to the technical field of catalytic chemistry. The steps of the invention comprise mixing alkali oxide sources, alumina sources, silica sources and water, stirring and synthesizing initial silica-alumina gel, then adding with Beta zeolite crystal seed, crystallizing 12-24 hours under the temperature of 100-180 DEG C and hydro-thermally synthesizing the Beta molecular sieve, SiO2/Al2O3 of the Beta zeolite crystal seed equals 22-25, and the quality of addition quantity is 5%-20% of the silica sources. The method of the invention suits requirements of applying zeolite molecular sieve in industry, not only can directly synthesize high crystallinity crystal of the Beta molecular, but also can increase crystallizing speed of the molecular and reduce manufacturing cost. Because the synthesis process doesn't use any organic templates without roasting, thereby a pore path is unimpeded, and environmental pollution and relatively consumption are avoided.

Description

technical field [0001] The invention belongs to the technical field of catalytic chemistry; in particular, it relates to a method for synthesizing Beta molecular sieves without using an organic template. Background technique [0002] Beta molecular sieves with three-dimensional 12-membered rings are widely used in petroleum refining and chemical industry as a very important catalytic material. Under normal circumstances, when using an organic template, for example, tetraethylammonium hydroxide (TEA + Oh - ) as a template, the synthesis time is generally 2 to 5 days. Moreover, these templates are all filled in the pores. Although it shows very superior performance in the catalytic reaction, its application is still severely restricted, because organic templates are used in the synthesis of Beta molecular sieves, which not only increases the cost of synthesis; but also removes these organic templates. Molecular sieves are often roasted at high temperatures, which results i...

Claims

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Application Information

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IPC IPC(8): C01B39/02
Inventor 肖丰收谢彬宋江伟任利敏纪研研
Owner JILIN UNIV
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