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Co-crystallization molecular screen preparation method

A technology of co-crystallization molecular sieve and crystallization, which is applied in molecular sieves and base exchange compounds, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as difficult exchange and large hydration ion radius, and achieve good repeatability, low synthesis cost, The effect of high crystallinity

Inactive Publication Date: 2008-08-06
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, through the traditional exchange method, the Re 3+ Ions are exchanged into the pores of molecular sieves, but due to the large radius of hydrated ions, it is difficult to exchange

Method used

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  • Co-crystallization molecular screen preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: the synthesis of pure MCM-22 molecular sieve

[0029] The ZSM-35 / MCM-22 co-crystal molecular sieve provided by the present invention is prepared by using silica sol as a silicon source and hexamethylene ethylene and cyclohexylamine as templates.

[0030] Weigh 20.3g silica sol (containing SiO 2 26.6wt.%) and 55.6 grams of deionized H 2 O, then weigh 2.40mL NaOH solution (0.10g / mL), weigh 0.71g NaAlO 2 (Al 2 o 3 43%, Na 2 (051.5%), after all adding in the reactor mixing, finally add 3.2 grams of mixed template agent R, wherein HMI / CHA (weight)=4:1. The final raw material ratio (molar ratio) is SiO 2 / Al 2 o 3 =30,H 2 O / SiO 2 =45, R / SiO 2 =0.35,Na 2 O / SiO2 = 0.11. The remaining steps are the same as in Comparative Example 1. The resulting product is MCM-22, and the XRD spectrum is shown in figure 2 , its crystallinity is slightly better than Comparative Example 1.

Embodiment 2

[0031] Embodiment 2: Synthesis of ZSM-35 / MCM-22 co-crystal molecular sieve

[0032] The ZSM-35 / MCM-22 co-crystal molecular sieve provided by the present invention is prepared by using silica sol as a silicon source and hexamethylene ethylene and cyclohexylamine as templates.

[0033] Weigh 20.3g silica sol (containing SiO 2 is 26.6wt.%) and 54.4 grams of deionized H 2 O, then weigh 3.58mL NaOH solution (0.10g / mL), weigh 0.53g NaAlO 2 (Al 2 o 3 43%, Na 2 O 51.5%), after all adding in the reaction kettle and mixing, finally add 3.2 grams of mixed template agent R, wherein HMI / CHA (weight)=3:1. Its final raw material ratio (molar ratio) is SiO 2 / Al 2 o 3 =40,H 2 O / SiO 2 =45, R / SiO 2 =0.35,Na 2 O / SiO 2 = 0.11. The remaining steps are the same as in Comparative Example 1. The obtained product is ZSM-35 / MCM-22 co-crystal molecular sieve. The XRD spectrum of the molecular sieve after calcination is shown in image 3 , wherein the ZSM-35 molecular sieve accounts for ...

Embodiment 3

[0034] Embodiment 3: the synthesis of ZSM-35 / MCM-22 cocrystal molecular sieve

[0035] The ZSM-35 / MCM-22 co-crystal molecular sieve provided by the present invention is prepared by using silica sol as a silicon source and hexamethylene ethylene and cyclohexylamine as templates.

[0036] The specific steps are the same as in Example 1 except that the added template R is a mixture of 3.2 grams of hexamethylene ethylene and cyclohexylamine, wherein HMI / CHA (weight)=1:1. The obtained product is the original powder of ZSM-35 / MCM-22 co-crystal molecular sieve. The XRD spectrum of the molecular sieve after roasting is shown in Figure 4 , wherein the weight percentage of the crystalline phase containing the ZSM-35 structural part in the co-crystallized molecular sieve is 50%.

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Abstract

The process of preparing cocrystallized molecular sieve of ZSM-35 accounting for 0-100 wt% and MCM-22 adopts the mixture of hexamethylene imine and cyclohexylamine as template agent. Compound of silicon and aluminum, hydroxide of alkali metal, hexamethylene imine, cyclohexylamine and deionized water as materials are crystallized at 90-200 deg.c for some period and reacted completely to synthesize the molecular sieve hydrothermally. The synthesized molecular sieve is catalyst used widely in the catalytic reaction of converting hydrocarbons, such as hydrocarbon isomerization and aromatization, etc.

Description

technical field [0001] The invention relates to a co-crystal molecular sieve. [0002] The present invention also relates to a preparation method of the above-mentioned co-crystallized molecular sieve. [0003] The present invention also relates to the use of the above-mentioned crystalline molecular sieves. Background technique [0004] ZSM-35 molecular sieve (USP 4016245) is composed of two pore systems of ten-membered ring and eight-membered ring, and has the properties of isomerization, aromatization, polymerization and cracking in the catalytic conversion of hydrocarbons. The templating agents selected during preparation are generally organic amines, such as diethylamine and its derivatives, hexamethyleneimine (USP4925548), a mixture of organic substances such as hexamethyleneimine (CN 00110356.3) and cyclohexane Amine (CN 01123880.1), etc. [0005] MCM-22 molecular sieve (USP 4954325) is a molecular sieve containing two non-intersecting pore systems, with dual struc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/46C01B39/48
Inventor 徐龙伢牛雄雷谢素娟
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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