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ZSM-22/ZSM-23 composite molecular screen and its 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 effects of low pour point, high viscosity index and high yield

Inactive Publication Date: 2006-05-10
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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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 screen and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 15.4 grams of sodium hydroxide was dissolved in 745 grams of water, 193.8 grams of silica sol (30% silicon dioxide) was added thereto, stirred for 2 hours, 15.0 grams of sodium ZSM-22 molecular sieve was added, and A was obtained after uniform stirring. 38.3 grams of pyrrolidine was added to the solution of 5.9 grams of aluminum sulfate and 244 grams of water, and B was obtained after stirring. Add B to A, stir vigorously for 24 hours, adjust the acidity and alkalinity of the system with 15.1 g of 98% concentrated sulfuric acid, and then continue vigorously stirring for 12 hours to obtain the initial colloid. The molar composition of the initial colloid is: SiO 2 / Al 2 o 3 =109, R / SiO 2 =0.56,OH - / SiO2 =0.08, Na / SiO 2 =0.4,H 2 O / SiO 2 =65, the addition of ZSM-22 molecular sieve is 0.26 of the silica weight. Transfer the initial colloid to a 2000 ml autoclave, seal it, adjust the stirring speed to 300 rpm, start to raise the temperature, raise the temperature to...

Embodiment 2

[0036] Dissolve 15.4 grams of sodium hydroxide in 571 grams of water, add 193.8 grams of silica sol (30% silicon dioxide) therein, stir for 2 hours, add 15.0 grams of sodium ZSM-22 molecular sieve, and obtain A after stirring evenly. 42 grams of isobutane was added to the solution of 5.9 grams of aluminum sulfate and 244 grams of water, and B was obtained after stirring. Add B to A, stir vigorously for 24 hours, adjust the acidity and alkalinity of the system with 15.1 g of 98% concentrated sulfuric acid, and then continue vigorously stirring for 12 hours to obtain the initial colloid. The molar composition of the initial colloid is: SiO 2 / Al 2 o 3 =109, R / SiO 2 =0.56,OH - / SiO 2 =0.08, Na / SiO 2 =0.4,H 2 O / SiO 2 =55, the addition of ZSM-22 molecular sieve is 0.26 of the silica weight. Transfer the initial colloid to a 2000 ml autoclave, seal it, adjust the stirring speed to 300 rpm, start to raise the temperature, raise the temperature to 175°C in 4 hours, and hydrot...

Embodiment 3

[0038] Dissolve 15.4 grams of sodium hydroxide in 571 grams of water, add 193.8 grams of silica sol (30% silicon dioxide) therein, stir for 2 hours, add 15.0 grams of sodium ZSM-22 molecular sieve, and obtain A after stirring evenly. 44 grams of isopropylamine are added to the solution of 1.5 grams of aluminum sulfate and 244 grams of water, and B is obtained after stirring. Add B to A, stir vigorously for 24 hours, adjust the acidity and alkalinity of the system with 15.1 g of 98% concentrated sulfuric acid, and then continue vigorously stirring for 12 hours to obtain the initial colloid. The molar composition of the initial colloid is: SiO 2 / Al 2 o 3 =300, R / SiO 2 =0.56,OH - / SiO 2 =0.08, Na / SiO 2 =0.4,H 2 O / SiO 2 =55, the addition of ZSM-22 molecular sieve is 0.26 of the silica weight. Transfer the initial colloid to a 2000 ml autoclave, seal it, adjust the stirring speed to 300 rpm, start to raise the temperature, raise the temperature to 175°C in 4 hours, and hy...

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Abstract

The invention relates to a ZSM-22 / ZSM-23 composite molecular sieve and a method for synthesis it, which contains: mixing ZSM-22 molecular sieve with alumina silica colloid prepared by mixing carbon source, aluminum source, inorganic base, water with template agent, and adjusting the acid-base quality of the solution with inorganic acid to prepare initial colloid, the mole composition of the colloid being: SiO2 / Al2O3= 60-300, R / SiO2= 0.05-3, OH- / SiO2= 0.05-0.5, M / SiO2=0.1-0.5, H2O / SiO2= 10-65, the usage of ZSM-22 molecular sieve being 1-60% of silica dioxide by weight, and the temperature agent being one or more of pyrrolidine, isopropyl amine or isobutylamine. The ZSM-22 / ZSM-23 composite molecular sieve is prepared by hydrothermal crystallization of initial colloid.

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 above-mentioned 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...

Claims

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Application Information

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IPC IPC(8): C01B39/02C01B39/04
Inventor 王炳春田志坚胡胜徐云鹏徐竹生林励吾
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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