A kind of CE isomorphous substituted LTL molecular sieve and preparation method thereof

A technology of isomorphic substitution and molecular sieve, which is applied in the field of inorganic chemical synthesis, can solve the problems that the placement of heteroatoms is not explained, and the yield of aromatic hydrocarbons from alkane aromatization is not very high, and achieves good industrialization prospects, high crystallinity, and improved liquid crystallinity. The effect of receiving

Active Publication Date: 2020-02-14
SYNFUELS CHINA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the yield of aromatic hydrocarbons in the alkane aromatization of the catalyst prepared by the above method is not very high, and the placement of heteroatoms is not explained.

Method used

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  • A kind of CE isomorphous substituted LTL molecular sieve and preparation method thereof
  • A kind of CE isomorphous substituted LTL molecular sieve and preparation method thereof
  • A kind of CE isomorphous substituted LTL molecular sieve and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Take 100.3g of KOH and 45.3g of aluminum hydroxide into 1300g of deionized water, stir evenly, transfer to a three-necked flask and react at 90°C for 12h, and cool to room temperature to obtain clear KAlO 2 Solution, K in the aluminum source solution 2 O:Al 2 O 3 The molar ratio is 2.56:1. Slowly add 668g of silica sol (SiO 2 The content is 30wt%), and the initial sol is obtained after strong stirring. Take 12.85g Ce(NO 3 ) 3 ·6H 2 O was dissolved in 200 g of deionized water to prepare a cerium source solution. The cerium source solution was slowly dropped into the sol and continued to stir vigorously. After aging at 20°C for 5 hours, it was transferred to a dynamic kettle and reacted at 150°C for 48 hours. After the crystallization is completed, the reactant is cooled to room temperature, filtered, washed with deionized water to neutrality, dried at 130°C for 6 hours, and calcined at 500°C for 4 hours to obtain Ce-containing LTL zeolite.

[0048] Among them, the amount o...

Embodiment 2

[0051] Add 100.3g KOH and 45.3g aluminum hydroxide to 1200g deionized water, stir well, transfer to a three-necked flask and react at 100°C for 24h. After cooling to room temperature, clear KAlO is obtained. 2 Solution, K in the aluminum source solution 2 O:Al 2 O 3 The molar ratio is 2.56:1. Slowly add 668g of silica sol (SiO 2 The content is 30wt%), and the initial sol is obtained after strong stirring. Take 64.25g Ce(NO 3 ) 3 ·6H 2 O was dissolved in 300 g of deionized water to prepare a cerium source solution. The cerium source solution was slowly added dropwise to the sol and continued to stir vigorously. After aging at 20°C for 5 hours, it was transferred to a dynamic kettle and reacted at 180°C for 48 hours. After the completion of crystallization, the reactant was cooled to room temperature, filtered, washed with deionized water to neutrality, dried at 100°C for 12h and calcined at 450°C for 8h to obtain Ce-containing LTL zeolite.

[0052] Among them, the amount of alumi...

Embodiment 3

[0055] Add 200.6g KOH and 45.3g aluminum hydroxide to 1100g deionized water, stir evenly, transfer to a three-necked flask, react at 90°C for 12h, and cool to room temperature to obtain clear KAlO 2 Solution, K in the aluminum source solution 2 O:Al 2 O 3 The molar ratio is 5.12:1. Slowly add 334g silica sol (SiO 2 The content is 30wt%), and the initial sol is obtained after strong stirring. Take 64.25g Ce(NO 3 ) 3 ·6H 2 O was dissolved in 400 g of deionized water to prepare a cerium source solution. The cerium source solution was slowly dropped into the sol and continued to stir vigorously. After aging at 20°C for 5 hours, it was transferred to a dynamic kettle and reacted at 150°C for 48 hours. After the completion of crystallization, the reactant was cooled to room temperature, filtered, washed with deionized water to neutrality, dried at 85°C for 22h and calcined at 580°C for 4h to obtain Ce-containing LTL zeolite.

[0056] Among them, the amount of aluminum hydroxide is Al ...

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Abstract

The invention discloses a Ce isomorphous substitution LTL molecular sieve and a preparation method thereof. The preparation method of the Ce isomorphous substitution LTL molecular sieve comprises thefollowing steps that cerium source, potassium source, silicon source, aluminum source and water are mixed to obtain colloidal sol; the colloidal sol is aged and crystallized in turn, and obtained solid is treated and roasted in turn to obtain the Ce isomorphous substitution LTL molecular sieve. The molecular sieve product prepared by the method has higher crystallinity and a more regular shape; inthe product prepared by the method, cerium components are existed in the molecular sieve in the form of cage-construction cerium; the molecular sieve can be used for a carrier of a C6-C8 hydrocarbonalkyl aromatization reaction to significantly improve the hydrocarbon yield and liquid yield of the aromatization reaction, and has good industrialization prospects.

Description

Technical field [0001] The invention relates to a Ce isomorphous substitute LTL molecular sieve and a preparation method thereof, and belongs to the technical field of inorganic chemical synthesis. Background technique [0002] Microporous molecular sieves have been widely used in fine chemical and petrochemical fields because of their regular pore structure and large specific surface area. The LTL molecular sieve consists of a one-dimensional straight channel parallel to the [001] direction composed of twelve-membered rings. The framework includes five-membered, six-, eight-, and twelve-membered ring structures. Due to its special topological structure and good hydrothermal stability, it is widely used in petroleum refining and petrochemical processes such as naphtha catalytic reforming, aromatization and catalytic cracking. [0003] The introduction of heteroatoms into the molecular sieve framework, due to the introduction of some specific metals, can adjust the acidity and alka...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/08B01J29/04C07C5/41C07C15/067
CPCB01J29/04B01J2229/183C01B39/08C01P2002/72C01P2002/84C01P2004/03C07C5/417C07C2529/04C07C15/067
Inventor 杨勇赵春利吴宝山陶智超云一峰黄丽华杨永陈骁李永旺
Owner SYNFUELS CHINA TECH CO LTD
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