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A kind of I zeolite and its preparation method and application

A technology of zeolite and zeolite crystal, which is applied in the field of silica-alumina zeolite and its preparation, can solve the problem of lack of L zeolite crystal morphology and particle size distribution control description, etc., and achieve high reactivity and aromatics selectivity, high purity, and high crystallinity Effect

Active Publication Date: 2020-12-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above methods, the crystal morphology and particle size distribution control of L zeolite is not described

Method used

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  • A kind of I zeolite and its preparation method and application
  • A kind of I zeolite and its preparation method and application
  • A kind of I zeolite and its preparation method and application

Examples

Experimental program
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preparation example Construction

[0021] The preparation method of zeolite provided by the invention comprises the following steps:

[0022] (1) Mix the directing agent, inorganic base, aluminum source, silicon source and water to obtain a reaction mixture gel. In the reaction mixture gel, the molar ratio of each substance is (2.0-4.0) inorganic base: Al 2 o 3 : (5~20) SiO 2 : (60~300)H 2 O; the composition of the directing agent is (5~10)K 2 O: Al 2 o 3 : (26~40) SiO 2 : (300~600)H 2 O, the inorganic base is selected from potassium hydroxide or a mixture of potassium hydroxide and sodium hydroxide,

[0023] (2) Perform static hydrothermal crystallization of the above reaction mixture gel at 100-200°C for 10-120 hours, during which there is at least one intermittent stirring time, the intermittent stirring time is 0.1-3.0 hours, and the solid after the crystallization reaction Wash and dry.

[0024] The step (1) of the above method is the preparation of the reactant gel. During the preparation process...

example 2

[0050] Preparation of the L zeolites of the present invention.

[0051] 107.08gAl(OH) 3 Add it into 1124.53mL of a solution containing 211.24gKOH, heat and dissolve to obtain aluminum sol, and add it to the reaction kettle containing 1198.61mL of silica sol together with the directing agent a prepared in Example 1a under stirring, and the amount of directing agent a is 5mol% ( Al in the directing agent 2 o 3 Al in materials without directing agent 2 o 3 molar ratio), stirred for 0.5 hour to form a white reaction mixture gel, and its molar composition was: 2.7K 2 O: Al 2 o 3 : 10SiO 2 : 180H 2 O.

[0052] Heat the above white gel to 150°C under stirring, stop stirring, carry out one-stage static crystallization for 24 hours, then carry out one-stage stirring crystallization for 1 hour, and then carry out two-stage static crystallization for 47 hours, and rapidly cool the crystallized product to 40°C, after centrifugation, take out the upper liquid, then wash the solid...

example 3

[0054] Prepare L zeolite according to the method of example 2, the difference is that crystallization temperature is 130 ℃, obtains L zeolite raw powder L-3, and its chemical composition is 1.08K 2 O: Al 2 o 3 : 5.644SiO2 2 , the reaction mixture composition and hydrothermal crystallization conditions are shown in Table 1, and the properties of the obtained zeolite are shown in Table 2.

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Abstract

The invention provides L-zeolite. Chemical composition of the L-zeolite is (0.8-5)K2O:Al2O3:(5-20)SiO2, average diameter d of the L-zeolite crystal grains is 0.1-2.0 mu m, and morphology index R is 0.2-1; in crystal grain integrity distribution, crystal grains with the morphology index R being 0.2-0.3 account for 3%-30% by mass of total quantity of the crystal grains, crystal grains with the morphology index R being 0.3-0.7 account for 40%-65% by mass of the total quantity of the crystal grains, and crystal grains with the morphology index R being 0.7-1.0 account for 10%-57% by mass of the total quantity of the crystal grains. The zeolite has higher crushing strength after being molded, and a Pt supported catalyst has higher alkane aromatization activity and selectivity and good active stability.

Description

technical field [0001] The invention relates to a silica-alumina zeolite and its preparation method and application, in particular to an L zeolite, its preparation method and a catalyst containing the L zeolite. Background technique [0002] L-type zeolite (International Zeolite Association code: LTL) is a synthetic zeolite developed by Union Carbide in 1965, and no equivalent has been found in nature so far. L zeolite is a kind of basic large-pore zeolite. Its crystal is cylindrical and has a one-dimensional channel structure parallel to the axis of the cylinder. , and then rotated according to the sixfold axis to produce a twelve-membered ring channel with a pore diameter of 0.71nm and a dynamic diameter of 0.81nm. The typical chemical composition and molecular formula of L zeolite is as follows: [0003] (0.9~1.3)M 2 / n O: Al 2 o 3 :xSiO 2 :yH 2 o [0004] In the formula, M is a metal ion, and the most important metal ion is K + , can also be replaced by other alk...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/32B01J29/62C07C5/41C07C15/04
CPCB01J29/62B01J2229/186C01B39/32C01P2002/72C01P2004/03C01P2004/61C01P2004/62C07C5/417C07C15/04Y02P20/52
Inventor 王嘉欣张玉红张大庆臧高山王涛于宁
Owner CHINA PETROLEUM & CHEM CORP
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