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Low-Pt long-chain alkane dehydrogenation catalyst as well as preparation method and application thereof

A technology for dehydrogenation catalysts and long-chain alkanes, which is applied in the field of catalysis and can solve problems such as inapplicability

Active Publication Date: 2021-06-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Jie et al. (Angew.Chem.Int., Ed.2017, 56:10170) of Oxford University reported that NiFe / SiC catalysts have the ability to rapidly dehydrogenate liquid alkanes under microwave conditions, but deep dehydrogenation mainly occurs, forming a product carbon, so the catalyst is not suitable for the reaction process of long-chain alkanes dehydrogenation to mono-olefins

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  • Low-Pt long-chain alkane dehydrogenation catalyst as well as preparation method and application thereof
  • Low-Pt long-chain alkane dehydrogenation catalyst as well as preparation method and application thereof

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preparation example Construction

[0030] According to a typical embodiment of the present invention, a method for preparing the above-mentioned low-Pt long-chain alkane dehydrogenation catalyst is provided. The preparation method comprises the following steps: S1, immersing the carrier in an aqueous solution containing soluble salts of Pt, Ni, Fe and alkali metals, then drying and roasting to obtain a primary catalyst; S2, washing the primary catalyst with water to obtain a secondary catalyst and S3, reducing the secondary catalyst in hydrogen to obtain a low-Pt long-chain alkane dehydrogenation catalyst.

[0031] Preferably, in S1, impregnating the carrier in an aqueous solution containing soluble salts of Pt, Ni, Fe and alkali metals is: impregnating the carrier in an aqueous solution containing soluble salts of Pt, Ni, Fe and alkali metals respectively, or containing two Or in a mixed solution of soluble salts corresponding to two or more metals; more preferably, the roasting temperature in S1 is 300-600°C....

Embodiment 1

[0037] Catalyst Preparation 1

[0038] The carrier of the catalyst is spherical γ-Al prepared according to Chinese patent CN104907103A 2 o 3 , whose technical specifications are:

[0039] Specific surface area: 205m 2 / g

[0040] Total pore volume: 1.71mL / g

[0041] Bulk density: 0.28g / mL

[0042] Water absorption: 2.0mL / g

[0043] Particle size: 1.5~2.5mm

[0044] 10g of this γ-Al 2 o 3 Vacuum equal volume immersion in 20mL mixed solution containing 0.08g chloroplatinic acid, 0.43g nickel chloride and 0.29g ferric chloride, after drying, bake at 500°C for 2 hours. After cooling, further impregnate in 20mL aqueous solution containing 0.14g potassium chloride in vacuum equal volume, after drying, roast at 500°C for 2 hours, and then wash with water at 500°C in a water vapor-air mixture with a water vapor content of 10%. 8h. After reduction at 400°C for 2 hours under a hydrogen atmosphere, a long-chain alkane dehydrogenation catalyst with a component content of 0.3% P...

Embodiment 2

[0046] Catalyst Preparation 2

[0047] The γ-Al described in 10g embodiment 1 2 o 3 Immerse in 20 mL of a mixed solution containing 0.14 g of potassium chloride, 0.43 g of nickel chloride and 0.29 g of ferric chloride in 20 mL of vacuum equal volume, after drying, bake at 500 ° C for 2 hours. After cooling, further vacuum equal volume impregnation in 20mL aqueous solution containing 0.08g chloroplatinic acid, after drying, roast at 500°C for 2 hours, and then wash with water at 500°C in a water vapor-air mixture with a water vapor content of 10%. 8h. After reduction at 490°C for 2 hours in a hydrogen atmosphere, a long-chain alkane dehydrogenation catalyst with a component content of 0.3% of Pt, 2.0% of Ni, 1.0% of Fe and 0.75% of K was obtained, designated as Cat-2.

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Abstract

The invention discloses a low-Pt long-chain alkane dehydrogenation catalyst as well as a preparation method and application thereof. The catalyst comprises a carrier, and Pt, Ni, Fe and alkali metal or an oxide thereof which are loaded on the carrier, and the loading amount of Pt is 0.05-0.6% by element mass. According to the catalyst, Pt-Ni-Fe is adopted as a composite active component, alkali metal is adopted as an auxiliary agent, the loading amount of Pt can be effectively reduced, and meanwhile good long-chain n-alkane dehydrogenation catalytic activity and stability are achieved.

Description

technical field [0001] The invention relates to the technical field of catalysis, in particular to a low-Pt type long-chain alkane dehydrogenation catalyst, its preparation method and application. Background technique [0002] Long-chain alkylbenzene is the main raw material for the production of detergent and anionic surfactant alkylbenzene sulfonate, and it can also be used as the base oil for lubricating oil and heat transfer oil. In industrial production, long-chain alkylbenzenes are mainly produced through the dehydrogenation-alkylation process of long-chain alkanes, which account for more than 70% of the global production of alkylbenzenes. The key step of this technical route is the dehydrogenation of long-chain alkanes to produce linear monoolefins, and the long-chain alkane dehydrogenation catalyst is the core of this step. Linear alkylbenzene sulfonate was first synthesized and produced by the catalytic dehydrogenation process of long-chain alkanes based on Pt cata...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J35/10B01J35/02B01J37/02B01J37/08B01J37/18C07C5/333C07C11/02
CPCB01J23/8946B01J35/1019B01J35/1047B01J35/0026B01J35/002B01J35/023B01J37/0201B01J37/08B01J37/18C07C5/333C07C11/02
Inventor 顾彬刘俊孙承林霍东亮荣欣王春生陈东潘乃俊杨燕张士博
Owner PETROCHINA CO LTD
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