Method for preparing alkane by photocatalysis of fatty acid decarboxylation

A fatty acid and photocatalytic technology, applied in chemical instruments and methods, organic chemistry, hydrocarbons, etc., can solve the problems of low conversion efficiency and harsh reaction conditions, and achieve low hydrogen consumption, good stability, and mild reaction conditions Effect

Active Publication Date: 2020-06-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The significance of the present invention is to overcome the shortcomings of the prior art of preparing alkanes from fatty acids, such as: harsh reaction conditions, low conversion efficiency, etc., under very mild reaction conditions (room temperature, low pressure hydrogen), realized photocatalytic fatty acid decarboxylation to produce long-chain alkanes efficiently

Method used

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  • Method for preparing alkane by photocatalysis of fatty acid decarboxylation
  • Method for preparing alkane by photocatalysis of fatty acid decarboxylation
  • Method for preparing alkane by photocatalysis of fatty acid decarboxylation

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Effect test

Embodiment 1

[0023] In a quartz reaction tube, add acetonitrile 1.5mL, octadecanoic acid 0.05mmol (concentration is 0.033mol / L) and Pt / TiO 2 (1wt%) 10mg, replace the atmosphere in the reaction tube with hydrogen (0.1MPa), seal, stir, and react at a temperature of 25°C. After reacting for 2.0h under the irradiation of LED (center wavelength 365nm, 18W), the product is detected by chromatography, and the mass spectrum of the product with standard spectrum Figure 1 As a result, the yield of heptadecane was 93%.

Embodiment 2

[0025] In a quartz reaction tube, add acetonitrile 1.5mL, octadecanoic acid 0.05mmol (concentration is 0.033mol / L) and Pd / TiO 2 (1wt%) 10mg, replace the atmosphere in the reaction tube with hydrogen (0.1MPa), seal, stir, and react at a temperature of 25°C. After reacting for 2.0h under the irradiation of LED (center wavelength 365nm, 18W), the product is detected by chromatography, and the mass spectrum of the product with standard spectrum Figure 1 As a result, the yield of heptadecane was 81%.

Embodiment 3

[0027] In a quartz reaction tube, add acetonitrile 1.5mL, octadecanoic acid 0.05mmol (concentration is 0.033mol / L) and Au / TiO 2 (1wt%) 10mg, replace the atmosphere in the reaction tube with hydrogen (0.1MPa), seal, stir, and react at a temperature of 25°C. After reacting for 2.0h under the irradiation of LED (center wavelength 365nm, 18W), the product is detected by chromatography, and the mass spectrum of the product with standard spectrum Figure 1 As a result, the yield of heptadecane was 76%.

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Abstract

The invention relates to a method for preparing alkane by photocatalysis of fatty acid decarboxylation. According to the method, in the presence of hydrogen, a catalyst and a solvent, different fattyacids are subjected to photocatalytic decarboxylation to prepare the alkane. The used catalyst is titanium dioxide and metal surface modified titanium dioxide. The reaction process comprises the following steps: mixing fatty acid, the solvent and the catalyst, putting the mixture into a quartz reactor, replacing the atmosphere in the reactor with the hydrogen, sealing, stirring, and reacting underthe irradiation of an external light source. By using the method provided by the invention, efficient conversion of the fatty acid can be realized under mild conditions of room temperature (15-40 DEGC)and low hydrogen pressure (less than or equal to 0.5 MPa), and the yield of the alkane can be up to 94%. The catalyst and the reaction system are easy to separate after reaction and can be recycledfor multiple times. The obtained alkane can be used for replacing traditional fossil diesel and aviation kerosene.

Description

technical field [0001] The invention relates to a method for preparing hydrocarbon compounds, in particular to a method for photocatalyzing fatty acid decarboxylation to prepare alkanes. Background technique [0002] With the rapid development of society, the demand for energy is also increasing sharply. At present, the fossil energy that society mainly relies on is limited, and the process of refining and using will bring environmental pollution, CO 2 Therefore, developing renewable clean energy and reducing dependence on fossil energy can effectively alleviate the current energy and environmental pollution problems. Among them, the conversion of renewable biomass resources into liquid fuels has become a research hotspot in the field of energy. [0003] Among biomass resources, fatty acids are considered to be ideal raw materials for the preparation of renewable alkane fuels because of their long carbon chain structure, low price, inedibility, and easy availability. After...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/207C07C9/22C07C9/15
CPCC07C1/2078C07C9/22C07C9/15Y02P30/20
Inventor 王峰黄志鹏张超锋韩建宇高著衍
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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