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Method for preparing composite molecular sieve of ZSM 5/ mordenite

A composite molecular sieve and mordenite technology, applied in molecular sieve catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of adding seed crystals, segmental crystallization and other complicated operations, and achieve good catalytic performance and good technology effect of effect

Active Publication Date: 2007-12-26
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is the complex technical problem of needing to add crystal seeds or segmental crystallization in the synthesis process of the composite molecular sieve in the prior art, and to provide a new preparation method of ZSM-5 / mordenite composite molecular sieve

Method used

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  • Method for preparing composite molecular sieve of ZSM 5/ mordenite
  • Method for preparing composite molecular sieve of ZSM 5/ mordenite

Examples

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Effect test

Embodiment 1

[0020] Take 284 grams of sodium metasilicate, dissolve it into solution A with 300 grams of distilled water, take 33.3 grams of aluminum sulfate, and make solution B with 100 grams of distilled water, slowly pour B solution into A solution, stir vigorously, and then add 24.4 grams of B Diamine, after stirring for a period of time, adjust the pH value at 11.5 with dilute sulfuric acid, and control the molar ratio of the sol: Si: Al: ethylenediamine: H 2 O=1:0.1:0.4:40, put the mixed solution into the autoclave, keep it warm at 180°C for 40 hours, then take out the compound molecular sieve of ZSM-5 and mordenite, denoted as FH -1, ZSM-5 / mordenite composite molecular sieve has an average silicon-aluminum molar ratio of 20. The XRD spectrum of the molecular sieve is shown in Figure 1, and the ratio of ZSM-5 molecular sieve and mordenite in the composite molecular sieve determined by XRD quantitative analysis method is shown in Table 6.

Embodiment 2～6

[0022] According to the method of Example 1, the pH of the control solution was different, and the composite molecular sieves were synthesized respectively, as shown in Table 1, which were respectively recorded as FH-2, FH-3, and FH-4. The XRD spectrum of the molecular sieve is shown in Figure 1, and the ratio of ZSM-5 and mordenite is shown in Table 6.

[0023] Table 1

[0024] Example

Embodiment 7～11

[0026] According to the method of Example 1, the composite molecular sieves synthesized by controlling the different silicon-aluminum ratios of the solution are shown in Table 2, the XRD pattern of the molecular sieve is shown in Figure 2, and the ratio of ZSM-5 and mordenite is shown in Table 6.

[0027] Table 2

[0028] Example

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Abstract

The invention relates to a preparation method of the ZSM-5 / mordenite compound molecular sieve, mainly solves the complex question which needs to add the seed crystal or subsect the crystallization in the existing compound molecular sieve synthesize process. Through controls the certain silicon aluminum ratio and the pH value in the molecular sieve synthesize process, the invention prepares the compound molecular sieve with the adjustable ZSM-5 and the mordenite proportion, the technical program solves the problem preferably. The molecular sieve which is prepared by the invention can be used in the industrial production of the naphtha catalytic pyrolysis system ethylene propylene.

Description

technical field [0001] The invention relates to a preparation method of ZSM-5 / mordenite composite molecular sieve. Background technique [0002] ZSM-5 molecular sieve and mordenite are widely used in petrochemical and other fields due to their good shape-selective catalytic performance and good thermal stability. However, because the two molecular sieves have uniform and single pore sizes, they cannot handle complex components separately, and their catalytic properties for the same reactants are different. Composite molecular sieves containing two components can handle complex components with different molecular diameters, and can also exert their synergistic catalytic effect. [0003] Documents CN1565967A and CN1565970A report using ZSM-5 molecular sieve or mordenite as a seed crystal, respectively adding mordenite or ZSM-5 molecular sieve to the synthesis solution, and synthesizing a mixed crystal material of ZSM-5 and mordenite. Its catalytic effect is better than the e...

Claims

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Application Information

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IPC IPC(8): B01J29/40B01J29/18
Inventor 马广伟谢在库胡永君施惠杨霞琴姚晖
Owner CHINA PETROLEUM & CHEM CORP
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