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A kind of ba heteroatom ltl molecular sieve and its preparation method and application

A technology of molecular sieves and heteroatoms, applied in Ba heteroatom-containing LTL molecular sieves and its preparation and application fields, can solve the problems of limited industrial application and poor stability of single-function catalysts, and achieve good crystallinity, high single-pot yield, and good The effect of applying the foreground

Active Publication Date: 2018-10-30
SYNFUELS CHINA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the stability of such single-functional catalysts is poor, which limits their industrial application.

Method used

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  • A kind of ba heteroatom ltl molecular sieve and its preparation method and application
  • A kind of ba heteroatom ltl molecular sieve and its preparation method and application
  • A kind of ba heteroatom ltl molecular sieve and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Add 39.1g KOH and 45.2g aluminum hydroxide to 900g deionized water, stir evenly, transfer to a four-necked flask and react at 80°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 1.1:1. Slowly add 345.3 g of silica sol (SiO 2 Content 30wt%), the initial sol was obtained after vigorous stirring. Take 31.2g Ba(NO 3 ) 2 Dissolve 34g of ethanol in 350g of deionized water to make a barium source solution. The barium source solution was slowly added dropwise into the sol and continued to stir vigorously, aged at 30°C for 16h, then transferred to a dynamic kettle, and reacted at 130°C for 20h. After the crystallization, the reactant was cooled to room temperature, filtered, washed with deionized water until neutral and dried to obtain Ba-containing LTL zeolite.

[0057] Among them, the amount of aluminum hydroxide is Al 2 o 3 In terms of KOH, the amount of K 2 In terms of O, the am...

Embodiment 2

[0060] Add 31.1g KOH and 45.2g aluminum hydroxide to 850g deionized water, stir evenly, transfer to a four-neck flask and react at 60°C for 14h, 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 0.8:1. Slowly add 345.3 g of silica sol (SiO 2 Content 30wt%), the initial sol was obtained after vigorous stirring. Take 35.2g Ba(NO 3 ) 2 Dissolve 68g of ethanol in 450g of deionized water to make a barium source solution. The barium source solution was slowly added dropwise into the sol and continued to stir vigorously, aged at 20°C for 20h, then transferred to an autoclave, and reacted at 120°C for 48h. After the crystallization, the reactant was cooled to room temperature, filtered, washed with deionized water until neutral and dried to obtain Ba-containing LTL zeolite.

[0061] Among them, the amount of aluminum hydroxide is Al 2 o 3 In terms of KOH, the amount of K 2 In terms of O, the amount o...

Embodiment 3

[0064] Add 36.1g KOH and 45.2g aluminum hydroxide to 650g deionized water, stir evenly, transfer to a four-necked flask and react at 70°C for 13h, 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 0.9:1. Slowly add 362.8g of silica sol (SiO 2 Content 30wt%), the initial sol was obtained after vigorous stirring. Take 41.2g Ba(OH) 2 ·8H 2 0 and 68 g of ethanol were dissolved in 450 g of deionized water to make a barium source solution. The barium source solution was slowly added dropwise into the sol and continued to stir vigorously, aged at 30°C for 24h, then transferred to an autoclave, and reacted at 140°C for 38h. After the crystallization, the reactant was cooled to room temperature, filtered, washed with deionized water until neutral and dried to obtain Ba-containing LTL zeolite.

[0065] Among them, the amount of aluminum hydroxide is Al 2 o 3 In terms of KOH, the amount of K 2 In terms ...

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Abstract

The invention discloses Ba hetero atom-containing LTL molecular sieve and a preparation method thereof. The preparation method of the molecular sieve comprises the following steps: a barium source, inorganic base, an aluminium source, a silicon source, water and alcohol are mixed according to a mol ratio in order to obtain sol, aging and crystallization are carried out in order, obtained solid is separated, washing and drying are carried out, and after roasting, the molecular sieve is obtained. The molecular sieve is advantageous in that: 1. the synthetic method is simple, single kettle yield is high, and synthesis and operation cost are low; 2. the product has good degree of crystallization, purity, and structured morphology; 3. the Ba hetero atom-containing LTL molecular sieve is used in an aromatization reaction of normal paraffins, and can obviously improve yield of aromatic hydrocarbons, especially yield of C8 aromatic hydrocarbons, and the molecular sieve has good application prospects.

Description

technical field [0001] The invention relates to a Ba heteroatom-containing LTL molecular sieve, a preparation method and application thereof. Background technique [0002] Zeolite L was first synthesized by Breck and Flanigen in 1958, and its crystal structure was determined by Barrer and Marshall. The L zeolite framework is composed of cannonite cages (CAN cages) and hexagonal column cages (D6R). The CAN cages and D6R cages are alternately connected around the sixfold axis of the C axis, and then rotated according to the sixfold axis to produce a twelve-membered ring. One-dimensional channel structure, the channel diameter is Typical structure is K 6 Na 3 Al 9 Si 27 o 72 21H 2 O, has good hydrothermal stability. [0003] In 1980, Bernard reported that platinum-loaded L molecular sieves had higher aromatic selectivity than traditional dual-functional reforming catalysts for linear alkanes, especially C6 and C7 normal alkanes. Since then, this single-functional refor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/32B01J29/60C07C5/41C07C15/04C07C15/06C07C15/067
CPCY02P20/52
Inventor 杨勇赵春利杨永陈骁黄丽华陶智超李永旺
Owner SYNFUELS CHINA TECH CO LTD
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