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will c 3 -c 9 Catalyst, preparation method and application of converting non-aromatic hydrocarbons into aromatic hydrocarbons

A C3-C9, non-aromatic technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, molecular sieve catalyst, etc., can solve the problem of low utilization rate of gallium component and stable zinc component Poor performance and other problems, to achieve the effect of delaying carbon deposition, plugging and deactivation, increasing single-pass life, and improving utilization rate

Active Publication Date: 2020-09-29
TSINGHUA UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] In order to overcome the relatively poor stability of the zinc component in the catalyst-zinc-based molecular sieves used solely for the preparation of aromatics from oxygen-containing organic matter, and to overcome the 3 -C 9 A Catalyst for Preparation of Aromatics from Non-Aromatic Hydrocarbons-Shortcomings of Low Utilization of Gallium Components in Gallium-Based Molecular Sieves

Method used

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Embodiment 1

[0029] A hydrogen-type molecular sieve ZSM-5 (Si / Al atomic ratio 30: 1, molecular sieve thickness 40 microns) was prepared by a conventional method. The hydrogen-type molecular sieve is added to the n-propyl ammonium hydroxide solution with a concentration of 0.33 mol / L, and the solution volume is 15 times the mass of the hydrogen-type molecular sieve. After stirring evenly, place it in a hydrothermal kettle for crystallization at 150°C for 10h. The resulting solid was washed by centrifugation, dried at 120° C. for 14 hours, and calcined at 350° C. for 3 hours to obtain a hollow hydrogen molecular sieve (the thickness of the hollow part of the molecular sieve is 70% of the overall thickness of the molecular sieve).

[0030] First, the molybdenum oxide precursor solution (ammonium molybdate solution) was soaked on the hollow hydrogen molecular sieve, and stirred at room temperature for 1 hour. Then evaporate the water at 100°C, roast at 450°C in the air for 24 hours, and then ...

Embodiment 2

[0034] Using conventional methods, hydrogen-type molecular sieve ZSM-11 (Si / Al atomic ratio 60:1, molecular sieve thickness 4 microns) was prepared. The hydrogen-type molecular sieve is added to the tetraethylammonium hydroxide solution with a concentration of 0.33mol / L, and the solution volume is 25 times the mass of the hydrogen-type molecular sieve. After stirring evenly, place it in a hydrothermal kettle and crystallize at 200°C for 10h. The obtained solid was washed by centrifugation, dried at 100° C. for 24 hours, and calcined at 650° C. for 3 hours to obtain a hollow hydrogen molecular sieve (the thickness of the hollow part of the molecular sieve is 60% of the overall thickness of the molecular sieve).

[0035] First, the precursor solution of gallium oxide (gallium nitrate solution) was impregnated on the hollow hydrogen molecular sieve, and stirred at room temperature for 2 hours. Then evaporate the water at 100°C, bake at 650°C in air for 12 hours, and then bake at...

Embodiment 3

[0038] A hydrogen type molecular sieve ZSM-22 (Si / Al atomic ratio 120: 1, molecular sieve thickness 0.4 micron) was prepared by a conventional method. The hydrogen-type molecular sieve is added to the concentration of 0.4mol / L n-propyl ammonium hydroxide, and the solution volume is 13 times of the mass of the hydrogen-type molecular sieve. After stirring evenly, place it in a hydrothermal kettle and crystallize at 170°C for 17h. The resulting solid was washed by centrifugation, dried at 105°C for 16 hours, and calcined at 550°C for 14 hours to obtain a hollow hydrogen molecular sieve (the thickness of the hollow part of the molecular sieve is 50% of the overall thickness of the molecular sieve).

[0039] First, the gallium oxide precursor solution (gallium nitrate solution) was soaked on the hollow hydrogen molecular sieve, and stirred at room temperature for 4 hours. Then evaporate the water at 110°C, bake at 450°C in the air for 24 hours, and then bake at 450°C in hydrogen ...

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Abstract

The invention relates to a catalyst for converting C3-C9 non-aromatic hydrocarbons into aromatic hydrocarbons, a preparation method and application. A structural unit of the catalyst includes a hollowhydrogen type molecular sieve and a high-concentration binary metal oxide active component on the surface of the hollow hydrogen type molecular sieve. The invention also discloses a method for preparing the hollow hydrogen type molecular sieve, and a method for loading and reduction to control the high-concentration binary metal oxide active component. When the catalyst is utilized to crack a rawmaterial mainly including C3-C9 non-aromatic hydrocarbons, the catalyst has advantages of a high conversion ratio, high aromatic hydrocarbon selectivity, long catalyst lifetime and low cost.

Description

technical field [0001] The present invention involves combining C 3 -C 9 Non-aromatic hydrocarbons are converted into the technical field of aromatic hydrocarbons, specifically relating to the conversion of C 3 -C 9 Catalyst, preparation method and application for converting non-aromatic hydrocarbons into aromatic hydrocarbons. Background technique [0002] Aromatic hydrocarbons are important chemical raw materials, which can be used to prepare medicines, polymer materials, etc., and are used in huge amounts. The traditional preparation route of aromatics is obtained by reforming naphtha. Due to the large amount of crude oil imported in my country, aromatics has been in short supply for a long time, and the import equivalent exceeds 60%. In the naphtha reforming process or coal-to-oil process, C is often produced 3 -C 9 The non-aromatic hydrocarbons have relatively low added value. It is a potential raw material for the preparation of aromatics. [0003] At present, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/48B01J29/40B01J29/70B01J29/78C10G35/095
CPCB01J23/002B01J29/405B01J29/48B01J29/7092B01J29/7869B01J2229/186C10G35/095C10G2400/30
Inventor 骞伟中侯一林杨逸风
Owner TSINGHUA UNIV
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