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High-silicon-to-aluminum-ratio hierarchical beta zeolite and preparing method thereof

A beta zeolite, high silicon-aluminum ratio technology, applied in the field of molecular sieve preparation and post-modification, can solve the problems of high equipment requirements, complex operation, large energy consumption, etc., to reduce equipment requirements, simplify processing technology, and improve efficiency. Effect

Active Publication Date: 2014-08-06
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the methods for the post-modification treatment of beta zeolite in the above-mentioned prior art all involve roasting and demolding treatment, hydrothermal treatment and ammonium exchange of beta zeolite, and the prepared beta zeolite has a low silicon-aluminum ratio or does not have many However, problems such as level pores cannot meet the requirements of improving the acidity and diffusion properties of beta zeolite at the same time.
Moreover, the hydrothermal treatment process in the above method has high requirements on equipment, complicated operation, and high energy consumption, which is not conducive to long-term and large-scale applications.

Method used

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  • High-silicon-to-aluminum-ratio hierarchical beta zeolite and preparing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] This embodiment provides a beta zeolite with a high silicon-aluminum ratio multi-stage channel, which is prepared by the following method:

[0039] Use beta zeolite raw powder as raw material, its silicon-aluminum ratio is 25, use 2mol / L hydrochloric acid with hydrochloric acid: raw material beta zeolite = 10:1 liquid-solid mass ratio to treat at 80 ℃ for 2 hours, after filtering and washing, at 120 Dry at ℃ for more than 5 hours to obtain beta zeolite after the first acid treatment;

[0040] The beta zeolite after the first acid treatment was placed in a muffle furnace, and after being roasted at 300°C for 2 hours, the temperature was raised to 550°C for 4 hours, and the heating rate was 4°C / min to obtain the first roasted beta zeolite;

[0041] Treat the beta zeolite after the first roasting with 2mol / L hydrochloric acid and hydrochloric acid:beta zeolite after the first roasting = 10:1 liquid-solid mass ratio at 80°C for 2h, after filtering and washing, at 120°C Un...

Embodiment 2

[0045] This embodiment provides a beta zeolite with high silicon-aluminum ratio multi-stage channels. Its preparation method and the raw material beta zeolite used are basically the same as in Example 1, except that 1.5mol / L hydrochloric acid is used for the first acidification. treatment and the second acid treatment.

[0046] The prepared beta zeolite was measured for its silicon-aluminum ratio, specific surface area and pore volume, and the results are shown in Table 1.

Embodiment 3

[0048] This embodiment provides a beta zeolite with high silicon-aluminum ratio multi-stage channels. Its preparation method and raw material beta zeolite are basically the same as in Example 1, except that 1.0mol / L hydrochloric acid is used for the first acidification. treatment and the second acid treatment.

[0049] The prepared beta zeolite was measured for its silicon-aluminum ratio, specific surface area and pore volume, and the results are shown in Table 1.

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Abstract

The invention relates to high-silicon-to-aluminum-ratio hierarchical beta zeolite and a preparing method of the beta zeolite. The bore diameters of channels of the beta zeolite are distributed in ranges smaller than 2nm, between 5 and 11nm, and greater than 50nm, wherein the micropore volume is greater than 0.19cm<3> / g, the total volume of meso pores and macro pores is greater than 0.35cm<3> / g, the silicon-to-aluminum ratio is greater than 90, and the specific surface area is greater than 400m<2> / g. The preparing method comprises the following steps that raw material beta zeolite is subjected to primary acid treatment; the beta zeolite subjected to the primary acid treatment is subjected to primary calcination; the beta zeolite after the primary calcination is subjected to secondary acid processing, and the high-silicon-to-aluminum-ratio hierarchical beta zeolite is obtained. The preparing method provided by the invention has the advantages that the operation is simple and efficient, and the prepared high-silicon-to-aluminum-ratio hierarchical beta zeolite has high acid, thermal and hydrothermal stability and good diffusion performance.

Description

technical field [0001] The invention relates to a beta zeolite with high silicon-aluminum ratio multi-stage channels and a preparation method thereof, belonging to the technical field of molecular sieve preparation and post-modification in the field of inorganic materials and catalysts. Background technique [0002] Post-modification of beta zeolite can improve its pore structure and adjust its silicon-alumina ratio, thereby changing the physical and chemical properties of the original zeolite, such as the diffusion properties of reactants and products in molecular pores, and the accessibility of active sites ( accessibility), the distribution and strength of acid sites (acidity), thermal and hydrothermal stability (stability), etc., and finally achieve the purpose of improving catalytic performance. Compared with beta zeolite with low silicon-aluminum ratio, beta zeolite with high silicon-aluminum ratio has better thermal and hydrothermal stability, stronger acidity and lip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02
Inventor 申宝剑王闻年张伟程珍珍申波俊申宝华
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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