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Beta molecular sieve with multistage pore structure and preparation method thereof

A technology of molecular sieves and channels, which is applied in the field of synthesis of Beta molecular sieves, can solve problems such as unfavorable acquisition, large-scale industrial production, and high prices of other raw materials.

Active Publication Date: 2015-03-18
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN102826564A discloses a preparation method of a Beta zeolite molecular sieve with a multi-level pore structure, using ethyl orthosilicate as a silicon source, sodium metaaluminate as an aluminum source, and hexaammonium cationic quaternary ammonium salt Surfactants are used as templates, although TEAOH is not used, other raw materials are expensive and not suitable for obtaining, and do not utilize large-scale industrial production

Method used

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  • Beta molecular sieve with multistage pore structure and preparation method thereof
  • Beta molecular sieve with multistage pore structure and preparation method thereof
  • Beta molecular sieve with multistage pore structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Example 1: Preparation of Samples 1-40

[0064] First, add the aluminum source into deionized water and stir evenly. Then add sodium hydroxide and / or potassium hydroxide to it, mix evenly, add silicon source, continue stirring at room temperature until a uniform silica-alumina gel is formed, finally add polyquaternium P, stir evenly, and obtain the initial gel . Move the initial gel into a stainless steel reaction kettle lined with polytetrafluoroethylene, directly put it into an oven for static crystallization, or put it into a rotating oven for dynamic crystallization, and the obtained solid product is centrifuged and washed with deionized water to medium properties, dried in air at 110°C, and finally calcined in a muffle furnace at 550°C for 8 hours to obtain a Beta molecular sieve with a hierarchical pore structure. The types and proportions of raw materials in the initial gels of the prepared samples 1-40, crystallization mode, crystallization temperature, crysta...

Embodiment 2

[0071] Embodiment 2: XRD characterization of sample 1-40

[0072] Samples 1-40 prepared in Example 1 were characterized by XRD to confirm that they were Beta zeolite molecular sieves. The instrument used is Philips X’Pert PROX X-ray diffractometer, copper target, K α radiation source The working voltage of the instrument is 40kv, and the working current is 40mA. The XRD spectrum of the obtained sample 1-40 and the characteristic spectrum of the standard Beta zeolite molecular sieve Figure 1 Sincerely. The typical XRD pattern is represented by sample 1, and the positions and peak intensities of the main diffraction peaks at 2θ at 5°-50° are shown in Table 2. Comparing the data results of other samples with those in Table 1, the position and shape of the diffraction peaks are the same, and the relative peak intensity fluctuates within ±5% according to the change of synthesis conditions, indicating that the synthesized product has the characteristics of Beta structure.

[...

Embodiment 3

[0075] Example 3: Chemical composition of samples 1-40 prepared in Example 1

[0076] The chemical composition of samples 1 to 40 prepared in Example 1 was measured by an elemental analyzer. The instrument used was a Magix (PHILIPS) X-ray fluorescence analyzer. + The standard-free quantitative analysis program corresponds the fluorescence intensity of the standard sample to its standard composition, and deducts the influence of interference spectral lines.

[0077] The result measured by the elemental analyzer is the percentage content of oxides of each element. The chemical composition and silicon-aluminum ratio of the sample can be obtained by inverting the percentage content of the oxide of the element, as shown in Table 3.

[0078] Table 3 Chemical composition of samples 1 to 40

[0079]

[0080]

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Abstract

A Beta molecular sieve having multi-level channels, and synthesizing method thereof; the molecular sieve has a second-level mesoporous structure, and uses polyquaternium-6, polyquaternium-7, polyquaternium-22 and quaternium-39 as guiding agents for both micropores and mesopores during the synthesizing process. The present invention uses cheap raw materials and a simple synthesizing method, and has broad industrial application prospects.

Description

technical field [0001] The invention relates to a method for synthesizing Beta molecular sieves. Background technique [0002] Beta molecular sieve is the only zeolite with three-dimensional twelve-membered ring straight channel system. Its unique pore structure and acidity make Beta molecular sieve have high catalytic activity for hydrocracking, hydroisomerization and adsorption capacity for linear alkanes. And has good resistance to sulfur and nitrogen poisoning. It can be used in the petrochemical industry to produce cumene by alkylation of benzene and propylene, disproportionation of cumene to dicumene, isopropylation of toluene, alkylation of aromatics, transalkylation of dicumene, etherification of propylene, methanol aromatics Preparation of catalysts for structuralization, etherification of propylene oxide and ethanol, methylation of phenol, methylation of aniline, transalkylation of cumene and toluene, and disproportionation and transalkylation of toluene. The com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04
CPCC01B39/04C01B39/48C01P2004/32C01P2004/03C01P2006/17C01P2006/14C01P2006/16C01P2004/45
Inventor 袁扬扬田鹏刘中民杨淼王林英杨越
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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