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

A composite molecular sieve, ZSM-23 technology, applied in molecular sieves and alkali exchange compounds, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as ineffectiveness

Inactive Publication Date: 2006-04-26
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-23/ZSM-22 composite molecular sieve and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 13.2 grams of sodium hydroxide was dissolved in 662 grams of water, 176.2 grams of silica sol (30% silicon dioxide) was added thereto, stirred for 5 hours, 15.0 grams of sodium ZSM-23 molecular sieve was added, and A was obtained after uniform stirring. 57.6 gram of diethylamine, add in the solution of 5.4 gram of aluminum sulfate and 244 gram of water, obtain B 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 = 108.6, R / SiO2 =0.9,OH - / SiO 2 =0.08, Na / SiO 2 =0.4,H 2 O / SiO 2 =65, the addition of ZSM-23 molecular sieve is 0.28 of the silica weight. Transfer the initial colloid to a 2-liter stainless steel autoclave lined with a polytetrafluoroethylene cup, put it into a rotating oven, adjust the rotation speed to 30 ...

Embodiment 2

[0036] Dissolve 13.2 grams of sodium hydroxide in 520 grams of water, add 5.0 grams of sodium ZSM-23 molecular sieve, stir for 0.5 hour, add 176.2 grams of silica sol (30% silicon dioxide), and stir to obtain A. 57.6 grams of diethylamine are added to the solution of 2.7 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 =217, R / SiO 2 =0.9,OH - / SiO 2 =0.08, Na / SiO 2 =0.4,H 2 O / SiO 2 =56, the addition of ZSM-23 molecular sieve is 0.09 of the silica weight. Transfer the initial colloid to a 2-liter stainless steel autoclave lined with a polytetrafluoroethylene cup, put it into a rotating oven, adjust the rotation speed to 30 rpm, raise the temperature to 160...

Embodiment 3

[0038] 13.2 grams of sodium hydroxide were dissolved in 520 grams of water, 176.2 grams of silica sol (30% silicon dioxide) was added thereto, stirred for 5 hours, 15.0 grams of sodium ZSM-23 molecular sieves were added, and A was obtained after uniform stirring. 85 grams of diethyltriamine are added to the solution of 5.4 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 = 108.6, R / SiO 2 =0.9,OH - / SiO 2 =0.08, Na / SiO 2 =0.4,H 2 O / SiO 2 =56, the addition of ZSM-23 molecular sieve is 0.28 of the silica weight. Transfer the initial colloid to a 2-liter stainless steel autoclave lined with a polytetrafluoroethylene cup, put it into a rotating oven, adjust th...

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Abstract

The present invention relates to one kind of composite ZSM-23 / ZSM-22 molecular sieve and its synthesis. The silicon-aluminum colloid obtained through mixing silicon source, aluminum source, inorganic alkali, water and template agent is mixed with ZSM-23 molecular sieve, and the pH value of the solution is regulated with inorganic acid to obtain the initial colloid with molar ratios of SiO2 / Al2O3 25-1500, R / SiO2 0.05-3, OH- / SiO2 0.05-0.5, M / SiO2 0.1-0.5 and H2O / SiO2 10-65, the ZSM-23 molecular sieve adding amount in 1-60 wt% of SiO2, and template agent being one or several of diethylamine, diethyl triamine, triethyl tetraamine, hexane diamine and octyl diamine. The initial colloid is hydrothermally crystallized to obtain the composite molecular sieve. The composite molecular sieve is used in the isomerization dewaxing of lubricant oil and exhibits excellent catalyzing performance.

Description

technical field [0001] The invention relates to a composite molecular sieve, in particular to a ZSM-23 / ZSM-22 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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IPC IPC(8): C01B39/48
Inventor 王炳春田志坚胡胜徐云鹏徐竹生林励吾
Owner PETROCHINA CO LTD
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