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High-silicon mordenite and preparation method thereof

A technology of mordenite and high silicon, applied in mordenite crystalline aluminum silicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problem of inability to produce hydrophobic MOR zeolite on an industrial scale, and achieve good microporous adsorption properties and perfect crystal structure Effect

Pending Publication Date: 2022-04-15
FUYU ZHANGJIAGANG NEW MATERIALS TECH CO LTD
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Problems solved by technology

[0008] For this reason, the present invention provides a kind of high silicon mordenite and preparation method thereof, can solve the technical problem that can't produce hydrophobic MOR zeolite on industrial scale

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  • High-silicon mordenite and preparation method thereof
  • High-silicon mordenite and preparation method thereof
  • High-silicon mordenite and preparation method thereof

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[0047] 1. Preparation method

[0048] 1.1. Preparation of H-MOR: Na-MOR was synthesized according to the documented Syntheses of Zeolitic Materials, Second Revised Edition, Edit.By H.Robson, 2001P212. Synthetic raw materials use silica gel as the silicon source, sodium aluminate as the aluminum source, and the molar composition of the reaction mixture formed by mixing sodium hydroxide and water is 6Na 2 O: Al 2 o 3 : 30SiO 2 : 78H 2 O. Stir the reactant evenly and place it in a stainless steel reaction kettle with a capacity of 4 cubic meters, and conduct a hydrothermal reaction at 170° C. for 24 hours under the condition of stirring. After the reaction product was washed and dried, it was ion-exchanged with 1.0M sulfuric acid solution at a liquid / solid ratio of 10 / 1 at a temperature of 90°C for 3 hours, then washed and dried to make H-MOR, which was sample A.

[0049] 1.2. Preparation of sample B: take 100g of H-MOR (sample A), use 1 molar concentration of oxalic acid s...

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Abstract

The invention relates to high-silicon mordenite and a preparation method thereof, and the preparation method comprises the following steps: step S1, treating Na-MOR with SAR = 14, which is hydrothermally synthesized in a fluorine-free all-inorganic silicon oxide-aluminum oxide-water reaction mixture system, with a sulfuric acid solution to prepare H-MOR zeolite; s2, carrying out high-temperature steam roasting on the H-MOR zeolite; step S3, carrying out acid solution treatment on the roasted H-MOR zeolite; and S4, washing the H-MOR zeolite treated by the acid solution, filtering, and drying to prepare the hydrophobic MOR zeolite. The high-silicon mordenite is hydrophobic MOR zeolite, the hydrophobic coefficient of the high-silicon mordenite is larger than 1, the benzene vapor adsorption capacity of the high-silicon mordenite is larger than 5.4%, the water vapor adsorption capacity of the high-silicon mordenite is smaller than 4.5%, the BET surface area of the high-silicon mordenite is larger than 530 m < 2 > / g, and the micropore volume of the high-silicon The hydrophobic MOR zeolite with the hydrophobic coefficient H larger than 1 is prepared through water vapor roasting and subsequent acid treatment modification, and the hydrophobic MOR zeolite has the good micropore adsorption property.

Description

technical field [0001] The invention relates to the field of zeolite preparation, in particular to a high-silicon mordenite and a preparation method thereof. Background technique [0002] High-silica mordenite (SAR≥14) has high thermal stability (above 1000°C). High-silicon mordenite is generally produced from low-silicon mordenite with a silicon-to-aluminum ratio of about 10, and is produced by acid extraction, high-temperature steam treatment, dealumination and silicon supplementation. The dealumination process is long, and while removing the framework aluminum, it often produces lattice defects and non-skeleton fragments to varying degrees, which leads to the performance of the obtained product in terms of physical and chemical properties and catalytic activity compared with directly synthesized mordenite with the same silicon-aluminum ratio. significant difference. Therefore, it is an important subject to study the synthesis method of mordenite with high silicon-alumin...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/26
Inventor 龙英才曹春华林德昌
Owner FUYU ZHANGJIAGANG NEW MATERIALS TECH CO LTD
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