C6-C9 alkane aromatization catalyst as well as preparation method and application thereof

A C6-C9, catalyst technology, applied in physical/chemical process catalysts, isomerization hydrocarbon production, molecular sieve catalysts, etc., can solve problems such as short service life, low aromatics selectivity, and alkane conversion rate below 60%

Active Publication Date: 2022-07-29
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

[0005] Patent CN111135858A discloses an aromatization catalyst, which is suitable for the aromatization of C5-C11 alkanes, but its longest service life can only reach about 180h, and after more than 180h, the conversion rate of alkane drops to 60% the following
[0006] Therefore, the current aromatization catalysts are mostly aimed at low-carbon alkanes, and the selectivity of aromatics is low, and the service life is short. structuring catalyst

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  • C6-C9 alkane aromatization catalyst as well as preparation method and application thereof
  • C6-C9 alkane aromatization catalyst as well as preparation method and application thereof
  • C6-C9 alkane aromatization catalyst as well as preparation method and application thereof

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preparation example Construction

[0046] The present invention also provides the preparation method of the C6-C9 alkane aromatization catalyst described in the above scheme, comprising the following steps:

[0047] Carrying out the second metal ion exchange and the first calcination of the hierarchically porous Kβ molecular sieve in turn to obtain M / Kβ molecular sieve, where M is one or more of In, W, Sn and Sb;

[0048] The M / Kβ molecular sieve is impregnated in a Pt metal precursor solution and then calcined for a second time to obtain a C6-C9 alkane aromatization catalyst.

[0049] In the present invention, the preparation methods of the hierarchical porous Kβ molecular sieve include two methods, denoted as method 1 and method 2, method 1 is an organic template method, and method 2 is an alkali-dissolving method, which will be described separately below.

[0050] In the present invention, described method one preferably comprises the following steps:

[0051] The hierarchical porous beta molecular sieve is...

Embodiment 1

[0079] Preparation of Hierarchical Porous β Molecular Sieve (Na Type) by Organosilylation Reagent Method: Dissolve 0.64g NaOH in 73.64g TEAOH aqueous solution (content is 25%); then add 35.74g SiO slowly with stirring at room temperature 2 sol, and the resulting mixture was stirred for an additional 10 min. 3.33gAl 2 (SO 4 ) 3 ·18H 2 O was dissolved in 20 g of water to form a solution, and the resulting aluminum sulfate solution was then added to the previously obtained sol. After that, the resulting mixture was heated to 80°C, stirred to a gel state, and then transferred to a Teflon cup, which was placed in a Teflon-lined autoclave, and 5.0 g of water was added outside the cup to The steam required for hydrothermal synthesis is generated. Under static conditions, the autoclave was sealed in a preheated air circulation oven and heated at 140°C for 6 h for pre-crystallization. After heating, the autoclave was taken out of the oven and quenched with cooling tap water to At...

Embodiment 2

[0088] (1) 3g of the multi-stage porous Hβ molecular sieves prepared in Example 1 were added to 210mL of 1.2mol / L KNO 3 The solution was maintained at 80 °C for 2 h, then washed with deionized water and dried. After exchanging twice according to the above process, the exchanged product was dried, and then calcined at 550°C for 6 hours in an air atmosphere in a muffle furnace to obtain a multi-level porous Kβ molecular sieve;

[0089] (2) 3 g of the hierarchically porous Kβ molecular sieve prepared in step (1) was added to 200 mL of an indium nitrate solution with a concentration of 0.002 mol / L, maintained at 80° C. for 12 hours, and then washed with deionized water and dried. After exchanging once according to the above process, the exchanged product was dried, and then calcined at 500°C for 5h in an air atmosphere in a muffle furnace to obtain In / Kβ molecular sieves;

[0090] (3) using an equal volume impregnation method to load platinum metal with a mass fraction of 1%, the...

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Abstract

The invention relates to the technical field of catalysts and provides a C6-C9 alkane aromatization catalyst as well as a preparation method and application thereof. The catalyst provided by the invention comprises the hierarchical pore beta molecular sieve as well as the Pt metal, the second metal and the potassium additive which are loaded on the hierarchical pore beta molecular sieve, and the dispersion of the Pt metal is promoted by loading the second metal, so that the aromatic hydrocarbon selectivity of the catalyst and the selectivity of a single product in aromatic hydrocarbon are improved, and meanwhile, the selectivity of the single product in the aromatic hydrocarbon is improved. The carrier adopted by the invention is a hierarchical pore beta molecular sieve with rich mesopores and micropores, and the existence of hierarchical pores can reduce the influence of diffusion resistance in aromatization reaction and promote diffusion, so that the stability of the catalyst is greatly improved. Results of the embodiment show that the catalyst provided by the invention is used for aromatization reaction of C6-C9 alkanes, the selectivity of aromatic hydrocarbons exceeds 90%, the selectivity of a single product in the aromatic hydrocarbons reaches 96%, and after the reaction is carried out for 275 hours, the conversion rate can be maintained at about 95%, and the selectivity of the aromatic hydrocarbons is about 90%.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a C6-C9 alkane aromatization catalyst and a preparation method and application thereof. Background technique [0002] Aromatic hydrocarbons are the basic organic chemical raw materials in my country. They are widely used in pesticides, plastics, dyes and fuels. At the same time, they are also an important gasoline additive due to their high octane number. The production of aromatics mainly comes from petroleum catalytic cracking technology, but with the diminishing petroleum resources, a non-petroleum route method needs to be developed. [0003] With the vigorous development of Fischer-Tropsch synthesis technology, Shanxi Institute of Coal Chemistry, Chinese Academy of Sciences has successfully applied several million-ton industrialization projects, which is a good non-petroleum route to produce oil products. However, 1 / 4 of the Fischer-Tropsch synthesis technology is Fischer-...

Claims

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Application Information

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IPC IPC(8): B01J29/74B01J35/10C07C5/31C07C15/06
CPCB01J29/7415C07C5/31B01J35/60C07C15/06Y02P20/52
Inventor 樊卫斌石莹周秋明董梅吴志伟秦张峰
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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