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Hierarchical-pore EU-1 molecular sieve and preparation method thereof

A EU-1, molecular sieve technology, applied in the direction of molecular sieve catalysts, molecular sieves and base exchange compounds, chemical instruments and methods, etc., can solve problems such as poor hydrothermal stability, fast catalytic reaction deactivation speed, and low molecular diffusion efficiency , to achieve the effect of alleviating the rate of silicon dissolution, retaining the volume of micropores, and increasing the solid yield

Active Publication Date: 2018-12-07
CHINA CATALYST HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of low molecular diffusion efficiency of reactants and poor hydrothermal stability on EU-1 molecular sieve, resulting in fast deactivation of catalytic reaction, and to provide a preparation method of multi-stage porous EU-1 molecular sieve material

Method used

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  • Hierarchical-pore EU-1 molecular sieve and preparation method thereof
  • Hierarchical-pore EU-1 molecular sieve and preparation method thereof
  • Hierarchical-pore EU-1 molecular sieve and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The EU-1 molecular sieve in Comparative Example 1 was used as the original powder, and the original powder was placed in a mixed alkaline solution formed by 0.08mol / L NaOH and piperazine, and treated with alkali at room temperature for 10 minutes, and the solid-liquid mass ratio was 1:20. SiO in Piperazine and EU-1 Molecular Sieve Raw Powder 2 The molar ratio is 0.02:1. Then add 0.4mol / L citric acid to the system to adjust the pH to neutral, filter out the solid, wash the solid with deionized water until it is neutral, and then dry it at 120°C for 12 hours; the dried solid is then placed in a 0.5mol / L The citric acid solution was refluxed at 120°C for 10 hours, and the solid-to-liquid mass ratio was 1:10; then the solid product was filtered out, and the solid product was deionized and washed to neutrality, and then dried at 120°C for 12 hours to obtain hierarchically porous EU -1 molecular sieve. figure 2 Explain that the obtained product is an EUO topological struct...

Embodiment 2-8

[0035] The preparation method of Examples 2-8 is basically the same as that of Example 1, the type of inorganic lye used, the type of piperidine compounds, the treatment time of molecular sieves in lye, the type of acid, the acid concentration, the mass ratio of solid to acid solution, and the reflux Each parameter such as temperature and time is different, as shown in table 1 and table 2; Nitrogen physical adsorption result shows, the sample that embodiment 1-8 obtains all contains mesopore structure, mesopore diameter distribution, average pore diameter and mesopore The pore volume is shown in Table 3:

[0036] Table 1

[0037]

[0038] Table 2

[0039]

[0040] *: product solid yield% = multi-level porous EU-1 molecular sieve product mass / initial EU-1 molecular sieve mass × 100%

[0041] table 3

[0042]

[0043]

[0044] It can be seen from Table 3 that the molecular sieves synthesized in the examples of the present invention have mesoporous structures of ...

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Abstract

The invention discloses a hierarchical-pore EU-1 molecular sieve and a preparation method thereof. The preparation method comprises the following steps: putting an EU-1 molecular sieve material with silicon oxide / aluminium oxide ratio being 20-200 into an inorganic base and piperazine organic base compound mixed alkaline solution, treating for 10-60min according to a solid / liquid ratio of 1:(10-50) at room temperature, then adding acid to regulate pH value to be neutral, filtering, washing, drying and then performing refluxing treatment for 0.5-12h at 80-120 DEG C on a sample and an acid solution with concentration of 0.01-0.5mol / L according to a mass ratio of 1:(10-50), and then filtering, washing and drying to obtain the hierarchical-pore EU-1 molecular sieve. The hierarchical-pore EU-1molecular sieve provided by the invention has good reaction molecular diffusibility, and has a good application prospect as a catalyst carrier.

Description

technical field [0001] The invention relates to a multi-stage porous EU-1 molecular sieve and a preparation method thereof, is a post-treatment method of the EU-1 molecular sieve, and belongs to the field of inorganic material synthesis. Background technique [0002] In the crystal structure of the EUO topological structure molecular sieve, there is a one-dimensional ten-membered ring 0.54nm×0.41nm channel in the [100] direction, and there are 0.81nm deep twelve-membered ring 0.68nm×0.58nm side pockets on both sides of the ten-membered ring channel. . EU-1, ZSM-50 and TPZ-3 molecular sieves all have EUO topology, among which EU-1 molecular sieve is a molecular sieve that has been widely studied in recent years. The bifunctional catalyst prepared by the acidic component of the structure catalyst shows good activity and selectivity in the catalytic reaction of C8 aromatics hydroisomerization and benzene isopropylation, and is known as a new generation of xylene isomerization ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/46B01J29/70B01J35/10
CPCC01B39/46B01J29/7023C01P2004/03C01P2002/72C01P2006/16C01P2006/14C01P2006/12B01J35/615B01J35/635B01J35/647
Inventor 王志光王建青王炳春李进
Owner CHINA CATALYST HLDG CO LTD
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