Method for synthesizing FER/MOR co-crystalline zeolite

A technology of molecular sieve and crystal seed, which is applied in the fields of material chemistry and catalytic chemistry, can solve problems such as environmental pollution and increase production costs, and achieve the effects of good crystallization quality, low cost, and good application prospects

Active Publication Date: 2016-08-03
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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The use of organic templates not only increases prod

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  • Method for synthesizing FER/MOR co-crystalline zeolite
  • Method for synthesizing FER/MOR co-crystalline zeolite
  • Method for synthesizing FER/MOR co-crystalline zeolite

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[0042] The method for preparing FER / MOR eutectic molecular sieves provided by the application comprises the following steps: mixing FER seed crystals, MOR seed crystals, silicon source, aluminum source, water and acid or alkali to obtain a reaction mixture; crystallizing the reaction mixture reaction to obtain a FER / MOR co-crystal molecular sieve, wherein the crystallization reaction is carried out without an organic template.

[0043] The term "FER seed crystal" used in this application refers to a single crystal phase crystalline material of natural or synthetic ferrierite (Ferrierite zeolite). The main elements of FER seed crystals are silicon, aluminum, coordinated oxygen atoms and inorganic cations, and its basic structural unit is a crystal material with a three-dimensional skeleton structure formed by silicon-oxygen tetrahedron or aluminum-oxygen tetrahedron. FER seeds have ten-membered and eight-membered ring channel systems. The FER seed crystal can be natural ferrie...

Embodiment 1

[0090] Embodiment 1: Preparation of FER / MOR eutectic molecular sieve

[0091] (1) Raw material

[0092] Silicon source: 5.24g white carbon black (99.5wt% SiO 2 , 0.5wt%H 2 O);

[0093] Aluminum source: 2.64g sodium metaaluminate solution (NaAlO 2 : 16.8wt%Al 2 o 3 , 31.2wt% NaOH, 52wt% H 2 O);

[0094] Alkali: 0.8ml sodium hydroxide solution (0.1gNaOH / ml)

[0095] Water: 45.5g deionized water;

[0096] FER seed crystal: 0.283gZSM-35 molecular sieve;

[0097] MOR seed: 0.113 g of natural mordenite.

[0098] SiO 2 Mass = 5.24 × 0.995 = 5.214g; the molar number of silicon element = 5.214 / 60 = 0.087mol; the converted mass of silicon element (that is, the SiO obtained by converting the molar number of silicon element 2 Mass)=5.214g; Al 2 o 3 Mass = 2.64 × 0.168 = 0.444g; molar number of aluminum element = 0.444 / 102 × 2 = 0.008mol; converted mass of aluminum element (that is, Al obtained by converting the molar number of aluminum element 2 o 3 Mass) = 0.444g; OH - N...

Embodiment 2

[0102] Embodiment 2: Preparation of FER / MOR eutectic molecular sieve

[0103] (1) Raw materials:

[0104] Silicon source: 8.89g white carbon black (95wt% SiO 2 , 5wt%H 2 O;

[0105] Aluminum source: 3.91g sodium metaaluminate solution (NaAlO 2 : 16.8wt%Al 2 o 3 , 31.2wt% NaOH, 52wt% H 2 O);

[0106] Alkali: 2.23ml sodium hydroxide solution (0.1gNaOH / ml);

[0107] Water: 135.0g deionized water;

[0108] FER seed crystal: 0.1gZSM-35 molecular sieve,

[0109] MOR seed: 0.1 g of natural mordenite.

[0110] SiO 2 Mass = 8.89 × 0.995 = 8.446g; the number of moles of silicon = 8.446 / 60 = 0.141mol; the conversion mass of silicon (that is, the SiO obtained by converting the number of moles of silicon) 2 Mass)=8.446g; Al 2 o 3 Mass = 3.91 × 0.168 = 0.657g; molar number of aluminum element = 0.657 / 102 × 2 = 0.012mol; converted mass of aluminum element (that is, Al obtained by converting the molar number of aluminum element 2 o 3 Mass) = 0.657g; OH - Number of moles=(0.1×...

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Abstract

The application provides a synthetic method of FER/MOR co-crystalline zeolite. The method comprises the following steps: mixing FER seed crystal, MOR seed crystal, a silicon source, an aluminium source, water and acid or alkali so as to obtain a reaction mixture; and adjusting reaction conditions such as ratio of the seed crystals, silica-alumina ratio, pH value of the system and the like, so as to obtain two-phase co-crystalline zeolite with adjustable crystalline phase ratio. According to the method, there is no need to add any organic template during the synthetic process, reaction cost can be reduced, and possible environmental pollution is decreased. The method of the invention has a good application prospect.

Description

field of invention [0001] The application belongs to the technical field of material chemistry and catalytic chemistry, and in particular relates to a method for synthesizing FER / MOR eutectic molecular sieves. Background technique [0002] FER molecular sieve is a layered molecular sieve material (U.S. 4,016,245) with a ferrierite (Ferrierite) topological structure. It belongs to the orthorhombic crystal system and has a vertically intersecting two-dimensional channel system. ×0.54nm, the size of the eight-membered ring channel is about 0.35×0.48nm. Due to its suitable channels, excellent thermal stability and acidity, it is widely used in hydrocarbon conversion reaction processes such as isomerization, polymerization and cracking. The traditional organic templates used in the synthesis of FER molecular sieves mainly include: ethylenediamine or pyrrolidine, butylenediamine, 1,4-dimethylpiperazine, hexamethyleneimine, and cyclohexylamine. [0003] MOR molecular sieve is a m...

Claims

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Application Information

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IPC IPC(8): B01J29/80C01B39/02C07C5/27C07C11/09
CPCB01J29/80C07C5/2775C07C2529/80C01B39/023C01B39/26C01B39/44C07C2529/18C07C2529/65B01J29/18B01J29/65B01J2229/62C07C11/09B01J37/031B01J37/04B01J2029/062C07C5/2518B01J35/0006
Inventor 李秀杰刘盛林朱向学谢素娟徐龙伢杨志强刘雪斌
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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