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Catalyst for electronically regulating straight-chain alkane aromatic reaction as well as preparation method and application thereof

A technology for straight-chain alkanes and catalysts, which is applied in the field of catalysts for the dehydrogenation and cyclization of straight-chain alkanes, can solve the problems of difficulty in industrial application of catalysts, high catalyst costs, easy deactivation of catalysts, etc., and achieves improved selectivity and catalytic deactivation. The effect of hydrogen activity, improvement of electron-deficient state, and improvement of carbon deposition resistance

Inactive Publication Date: 2021-03-12
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still obvious problems in Pt / KL series catalysts: on the one hand, the noble metal Pt loading in Pt / KL catalysts is relatively high, close to about 1 wt.%, which is more than three times the noble metal Pt loading of platinum reforming catalysts, resulting in catalyst have a higher cost
On the other hand, the noble metal Pt is prone to migration and sintering at higher reaction temperatures, resulting in the catalyst being easily deactivated.
Therefore, Pt / KL series catalysts have certain difficulties in industrial application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Mix 10 g of ethylene glycol with 40 g of deionized water, dissolve 0.018 g of tetraammineplatinum dichloride in the mixed system of water and ethylene glycol, then add 2 g of commercial grade KL molecular sieves, and then sonicate for 20 min. Stir at 60 °C until the solvent evaporates completely, and then dry in an oven at 120 °C for 24 h. The catalyst was then ground into powder and calcined in a muffle furnace at 300 °C for 3 h with a heating rate of 2 °C min −1 .

[0028] Then, the performance evaluation of the n-hexane dehydrocyclization aromatization reaction was carried out. The catalyst dosage was 100 mg, the reaction pressure was 0.1 MPa, the raw material gas was a mixture of n-hexane and hydrogen, and the space velocity was 1 h. −1 .

Embodiment 2

[0030] Mix 10 g of ethylene glycol with 40 g of deionized water, 0.018 g of platinum dichlorotetraammine and 0.060 g of Ga(NO 3 ) 3 9H 2 O was dissolved in a mixed system of water and ethylene glycol, then 2 g of commercial grade KL molecular sieves were added, then ultrasonicated for 20 min, stirred at 60 °C until the solvent evaporated completely, and then dried in an oven at 120 °C for 24 h . The catalyst was then ground into powder and calcined in a muffle furnace at 300 °C for 3 h with a heating rate of 2 °C min −1 .

[0031] Then, the performance evaluation of the n-hexane dehydrocyclization aromatization reaction was carried out. The catalyst dosage was 100 mg, the reaction pressure was 0.1 MPa, the raw material gas was a mixture of n-hexane and hydrogen, and the space velocity was 1 h. −1 .

Embodiment 3

[0033] 10 g ethylene glycol was mixed with 40 g deionized water, 0.018 g dichlorotetraammine platinum and 0.072 g Fe(NO 3 ) 3 9H 2 O was dissolved in a mixed system of water and ethylene glycol, then 2 g of commercial grade KL molecular sieves were added, then ultrasonicated for 20 min, stirred at 60 °C until the solvent evaporated completely, and then dried in an oven at 120 °C for 24 h . The catalyst was then ground into powder and calcined in a muffle furnace at 300 °C for 3 h with a heating rate of 2 °C min −1 .

[0034] Then, the performance evaluation of the n-hexane dehydrocyclization aromatization reaction was carried out. The catalyst dosage was 100 mg, the reaction pressure was 0.1 MPa, the raw material gas was a mixture of n-hexane and hydrogen, and the space velocity was 1 h. −1 .

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Abstract

The invention discloses a catalyst for electronically regulating straight-chain alkane aromatization reaction as well as a preparation method and application of the catalyst. The catalyst is preparedby loading a noble metal Pt component, metal aids Ga, Fe and rare earth elements (La, Ce and Yb) on a KL molecular sieve through a double-solvent impregnation method, wherein the mass fraction of thePt metal is 0.1-1%, and the mass fraction of the metal aids are 0.01-2%. A certain mass of metal aids Ga and Fe or rare earth elements (La, Ce and Yb) are added in the noble metal Pt component loadingprocess. The metal aids can firstly segment noble metal Pt nanoparticles, promote dispersion of the noble metal Pt nanoparticles in pore channels of the molecular sieve, improve the dispersion degreeof Pt, and improve the selectivity and catalytic dehydrogenation activity. Then electron interaction occurs between the metal aids and Pt, so Pt is in an electron-rich state, an intermediate producton Pt is easier to desorb, deep dehydrogenation of Pt is prevented from generating carbon deposition, and the stability of the catalyst and the selectivity of aromatic hydrocarbon are improved.

Description

technical field [0001] The invention belongs to the technical field of straight-chain alkane dehydrocyclization aromatization reaction catalysts, and relates to a catalyst capable of electronically regulating the dehydrocyclization aromatization reaction of straight-chain alkane, as well as its preparation method and application. Background technique [0002] Light aromatics are important bulk chemicals and basic chemical raw materials in the modern chemical industry. They are widely used in the manufacture of various important means of production and living. They are also important blending components of high-quality gasoline, which are related to the national economy and people's livelihood. my country is the world's largest consumer of benzene and p-xylene, and with the rapid development of my country's social economy, the demand for BTX is still increasing rapidly, and my country's external dependence on BTX reaches 20%‒60%. At present, catalytic reforming technology is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/74B01J29/76B01J37/34B01J37/08B01J37/18C07C5/367C07C15/04
CPCB01J29/74B01J29/76B01J37/082B01J37/18B01J37/343B01J2229/186C07C5/367C07C2529/74C07C2529/76C07C15/04Y02P20/52
Inventor 王熙孙超杨一君伊丁陆飞
Owner BEIJING JIAOTONG UNIV
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