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Method for generating new faujasite zeolites

A technology of faujasite and size, applied in the field of sequential acid treatment and alkali treatment of faujasite, can solve the problems of reducing, insufficient to prepare attractive mesoporous faujasite, serious inherent zeolite properties and the like

Pending Publication Date: 2021-09-07
泽波尔技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] However, for unit cell sizes -1 ), existing post-synthetic strategies are insufficient to prepare attractive mesoporous faujasites (see e.g. Adv. Funct. Mater, 2012, 22, 916-928, Table 1)
Neither direct base treatment nor the application of an acid-base treatment strategy resulted in the desired mesopore formation, and / or caused a severe and undesired reduction in intrinsic zeolitic properties

Method used

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  • Method for generating new faujasite zeolites
  • Method for generating new faujasite zeolites
  • Method for generating new faujasite zeolites

Examples

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preparation example Construction

[0042] The present invention relates to a kind of preparation method of process catalyst, this method comprises the following steps:

[0043] - preparation of treated inorganic porous solids according to the first aspect of the present invention and preferred embodiments thereof;

[0044] - adding one or more additional ingredients to form the mixture, preferably wherein the one or more additional ingredients are selected from fillers, pyrogenic substances, binders, lubricants, and combinations thereof; and

[0045] - Shaping the mixture into a macroscopic form to obtain the process catalyst, preferably wherein the macroscopic form has a minimum dimension of at least 1 μm up to 10 cm.

[0046] The inventors have found that the solids obtained by the present invention are ideal intermediate compounds for the preparation of process catalysts as described above.

[0047] The mesoporous zeolite material obtained by the present invention can have controllable mesoporous volume, me...

Embodiment 10

[0079] Example 10: In addition to using 2.2mmol g -1 NaH 2 Citrate instead of 1.6mmol g -1 Except for the citric acid, the same faujasite and treatment as in Comparative Example 6 were used. In this case, the amount of protons derived from the salt in the acid step was 50%. The solids obtained demonstrate that, like the solids obtained in Examples 11, 12, 14 and 16, the treatment of the invention applied to faujasite with Si / Al = 2.6 and a unit cell size of 24.53 Angstroms produces a BET with a significant increase mesoporous zeolites with largely preserved micropore volume and largely increased mesoporous surface and volume (Table 3). Therefore, only acid and base treatments according to the invention are able to produce octahedral zeolites with preferred porosity: high V micro and a high V meso ( figure 1 ) and high S BET ( figure 2 )s solid type. In each case of the examples, the amount of salt-derived protons in the acid step ranged from 20-90% at a pK range of -...

Embodiment 11

[0080] Example 11: In addition to using 1.1 mmol g -1 H 4 EDTA and 1.1 mmol g -1 Na 2 h 2 EDTA instead of 1.6mmol g -1 Except for the citric acid, the same faujasite and treatment as in Comparative Example 6 were used. In this case, the amount of protons derived from the salt in the acid step was 50%.

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Abstract

The invention is broadly drawn to a process to introduce mesoporosity in faujasite zeolites with Si / Al<5 and unit cell sizes below 24.58 Angstrom by an inventive sequence of acid and base treatments, yielding superior physico-chemical and catalytic properties compared to the materials prepared according to the teachings known in the state of the art. Part of the invention relates to the acid step which is executed in the presence of a salt of which the anion is able to form multi-ligand complexes with aluminum, and of which a specific amount of cations are protonic (ca. 90% to 20% of the total cations with -3<pK<6). The superior properties may be the combination of an enhanced mesoporosity with a higher Brønsted acidity, a higher microporosity, a higher mesoporosity, a higher crystallinity, and / or combinations hereof.

Description

technical field [0001] The present invention generally relates to a process for sequential acid and base treatment of steam-treated faujasite with high aluminum content which results in excellent physicochemical and catalytic properties. Background technique [0002] Zeolites are microporous aluminosilicate oxide structures with a well-defined pore structure due to their high degree of crystallinity. Crystalline aluminosilicate zeolites can be of natural and synthetic origin. In the protic form, crystalline aluminosilicate zeolites are generally composed of the formula H x Al x Si 1-x o 2 , where "H" is the (exchangeable) proton that balances the tetrahedral valency. The amount of exchangeable protons is called the cation exchange capacity (CEC). Exchangeable protons can be easily replaced by other cations such as ammonium, potassium and sodium ions. The precise structure type of an aluminosilicate zeolite is usually determined by a specific molar ratio of silicon to ...

Claims

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Application Information

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IPC IPC(8): C01B39/02C01B39/24B01J29/08B01J35/10B01J29/10
CPCC01B39/026C01B39/24B01J29/084B01J29/10B01J2229/37B01J2229/38C10G47/20C10G11/05B01J35/617B01J35/635B01J35/647C01P2006/12C01P2006/14B01J35/633
Inventor D·沃博肯德M·德卢因
Owner 泽波尔技术股份有限公司
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