ZSM-22/ZSM-23 composite molecular sieve and preparation method

A composite molecular sieve, ZSM-23 technology, applied in the direction of crystalline aluminosilicate zeolite, etc., can solve problems such as ineffectiveness, and achieve the effect of low pour point, good synergistic effect and high viscosity index

Inactive Publication Date: 2005-10-26
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, it is hoped that a catalyst has multiple functions of shape-selective cracking and isomerization at the same time, and good results cannot be achieved if a single molecular sieve is used

Method used

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  • ZSM-22/ZSM-23 composite molecular sieve and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] 4.4 g NaAlO 2 (Al 2 o 3 36.3%, Na 2 (22.5%) was added in the mixture of 4.1 gram NaOH and 474 gram water, stirred 4 hours, then added the sodium type ZSM-22 molecular sieve synthesized by 15 gram comparative examples, stirred 3 hours, added 66 gram pyrrolidine, stirred 1 Hour, finally add 261.1 grams of 30% silica sol to obtain the initial colloid. The molar composition of the initial colloid is: SiO 2 / Al 2 o 3 =83, R / SiO 2 =0.7,OH - / SiO 2 =0.08,H 2 O / SiO 2 =25, the addition of ZSM-22 molecular sieve is 0.2 of the silica weight. After stirring for 12 hours, it was transferred to a 1000 ml autoclave, and after sealing, the stirring speed was adjusted to 300 rpm, and the temperature was raised to 165° C. in 4 hours, followed by hydrothermal crystallization for 72 hours. After the crystallization was completed, the autoclave was placed in water for rapid cooling, the product was filtered and washed until the pH of the filtrate was neutral, and then dried at 1...

Embodiment 2

[0075] 6.1 g NaAlO 2 (Al 2 o 3 36.3%, Na 2 (22.5%) was added in the mixture of 4.1 gram NaOH and 1232 gram water, stirred 4 hours, then added the hydrogen type ZSM-22 molecular sieve synthesized by 45 gram comparative example, stirred 3 hours, added 283 gram pyrrolidine, stirred 1 Hour, finally add 261.1 grams of 30% silica sol to obtain the initial colloid. The molar composition of the initial colloid is: SiO 2 / Al 2 o 3 =60, R / SiO 2 =3,OH - / SiO 2 =0.08, H 2 O / SiO 2 =65, the addition of ZSM-22 molecular sieve is 0.6 of the silica weight. After stirring for 12 hours, it was transferred to a 2000 ml high-pressure reactor. After sealing, the stirring speed was adjusted to 300 rpm, and the temperature was raised to 165° C. in 4 hours, and hydrothermal crystallization was carried out for 72 hours. After the crystallization was completed, the autoclave was placed in water for rapid cooling, the product was filtered and washed until the pH of the filtrate was neutral, a...

Embodiment 3

[0077] 1.2 g NaAlO 2 (Al 2 o 3 36.3%, Na 2 (2.5%) was added in the mixture of 25.6 gram NaOH and 474 gram water, stirred 4 hours, then added the sodium type ZSM-22 molecular sieve synthesized by 0.75 gram comparative example, stirred 3 hours, added 4.7 gram pyrrolidine, stirred 1 Hour, finally add 261.1 grams of 30% silica sol to obtain the initial colloid. The molar composition of the initial colloid is: SiO 2 / Al 2 o 3 =300, R / SiO 2 =0.05,OH - / SiO 2 =0.5,H 2 O / SiO 2 =25, the addition of ZSM-22 molecular sieve is 0.01 of the silica weight. After stirring for 12 hours, it was transferred to a 1000 ml autoclave, and after sealing, the stirring speed was adjusted to 300 rpm, and the temperature was raised to 165° C. in 4 hours, followed by hydrothermal crystallization for 72 hours. After the crystallization was completed, the autoclave was placed in water for rapid cooling, the product was filtered and washed until the pH of the filtrate was neutral, and then dried ...

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Abstract

The present invention relates to a ZSM-22/ZSM-23 compound molecular sieve and its synthesis method. The aluminosiica colloid obtained by mixing silicon source, aluminium source, inorganic alkali, water and template agent and ZSM-22 molcular sieve are mixed, then molar composition of said aluminosilica colloid includes SiO2/Al2O3=60-300, R/SiO2=0.05-3, OH-/SiO2=0.05-0.5 and H2O/SiO2=10-65, and the added quantity of ZSM-22 molecular sieve is 0.01-0.6 of weight of silicon dioxide, and the template agent can be one of pyrrolidine, isopropyl amine and isobutyl amine or several kinds of them, and the obtained reaction mixture is undergone the process of hydrothermal crystallization so as to obtain the invented compound molecular sieve.

Description

technical field [0001] The invention relates to a composite molecular sieve, in particular to a ZSM-22 / ZSM-23 composite molecular sieve. [0002] The present invention also relates to the preparation method of the composite molecular sieve. Background technique [0003] Zeolite molecular sieve materials have special shape-selective catalytic properties due to their uniform composition, regular structure, adjustable surface acidity and molecular size pores, and are used as catalytic materials, gas separation and adsorbents, ion exchangers, etc. It has been widely used in the fields of oil and natural gas processing, fine chemicals, environmental protection and nuclear waste treatment. The catalytic function of molecular sieves has also developed from simple acid catalysis to base catalysis, acid-base bifunctional catalysis, oxidation-reduction catalysis and metal catalysis. The basis of molecular sieve catalytic functionalization and application expansion is the development...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02
Inventor 王炳春田志坚徐云鹏徐竹生林励吾
Owner PETROCHINA CO LTD
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