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Ce isomorphous substitution 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: 2018-07-17
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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  • Ce isomorphous substitution LTL molecular sieve and preparation method thereof
  • Ce isomorphous substitution LTL molecular sieve and preparation method thereof
  • Ce isomorphous substitution LTL molecular sieve and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Add 100.3g KOH and 45.3g aluminum hydroxide to 1300g deionized water, stir evenly, transfer to a three-necked flask and react at 90°C for 12h, 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. In this solution, slowly add 668g silica sol (SiO 2 Content 30wt%), the initial sol was obtained after vigorous stirring. Take 12.85g Ce(NO 3 ) 3 ·6H 2O was dissolved in 200 g of deionized water to make a cerium source solution. The cerium source solution was slowly added dropwise into the sol and continued to stir vigorously, aged at 20°C for 5h, then transferred to a dynamic kettle, and reacted at 150°C for 48h. After crystallization, the reactant was cooled to room temperature, filtered, washed with deionized water until neutral, 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 of aluminum hydroxide is Al ...

Embodiment 2

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

[0052] Among them, the amount of aluminum hydroxide ...

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, 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. In this solution, slowly add 334g silica sol (SiO 2 Content 30wt%), the initial sol was obtained after vigorous stirring. Take 64.25g Ce(NO 3 ) 3 ·6H 2 O was dissolved in 400 g of deionized water to make a cerium source solution. The cerium source solution was slowly added dropwise into the sol and continued to stir vigorously, aged at 20°C for 5h, then transferred to a dynamic kettle, and reacted at 150°C for 48h. After crystallization, the reactant was cooled to room temperature, filtered, washed with deionized water until neutral, dried at 85°C for 22 hours, and calcined at 580°C for 4 hours to obtain Ce-containing LTL zeolite.

[0056] Among them, the amount of aluminum hydroxide is Al 2 ...

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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 isomorphic substituted LTL molecular sieve and a preparation method thereof, belonging 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. LTL molecular sieves are composed of twelve-membered rings with one-dimensional straight channels parallel to the [001] direction, and the skeleton includes five-membered rings, six-membered rings, eight-membered rings and twelve-membered rings. 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 adj...

Claims

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Application Information

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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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