Method for improving selectivity of cis pinane prepared by alpha-pinene hydrogenation

A magnetic and nano-nickel technology, applied in the fields of hydrogenation to hydrocarbon production, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of high cost and difficulty

Inactive Publication Date: 2011-10-05
TIANJIN ANKAITE CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, many literatures have reported that to obtain nano-nickel-based materials with a one-dimensional linear structure, it is often necessary to introduce a high-intensity external magnetic field in the reaction, and this method of applying an external energy field is difficult and costly in batch production. higher

Method used

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  • Method for improving selectivity of cis pinane prepared by alpha-pinene hydrogenation
  • Method for improving selectivity of cis pinane prepared by alpha-pinene hydrogenation
  • Method for improving selectivity of cis pinane prepared by alpha-pinene hydrogenation

Examples

Experimental program
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Effect test

Embodiment 1

[0017] These examples illustrate the use of silica sol-supported amorphous Ni as precursor to magnetic Fe 3 o 4 As a carrier, nano-nickel catalysts with different compositions and needle-like morphology were prepared by adjusting the ratio of amorphous and crystalline Ni.

[0018] The first is the preparation of silica sol supported amorphous Ni. Prepare a certain concentration of KBH 4 The solution has a concentration of 0.1 to 2.0 mol / L, and is uniformly mixed with a certain amount of silica sol. Then prepare a certain concentration of nickel salt solution, the concentration is 0.02 ~ 2.83mol / L, nickel salt and KBH 4 The molar ratio is 1:2. Under a certain protective gas, drop the nickel salt solution into the above mixed solution at a certain speed (1-12mL / min), control the reaction temperature at 0-30°C, and react until no gas is produced. The product is amorphous Ni supported by silica sol, and it is used as the precursor of reducing crystalline nano-nickel. Then, p...

Embodiment 2

[0020] These examples illustrate the use of different meshes of magnetic Fe 3 o 4 The process of preparing needle-shaped nano-nickel catalyst with powder as carrier.

[0021] Using different meshes of magnetic Fe 3 o 4 (100 mesh, 200 mesh, 300 mesh, 600 mesh, 800 mesh) is carrier, according to the method among the embodiment 1, prepares the acicular nano-nickel catalyst. When using 600 mesh magnetic Fe 3 o 4 The catalyst prepared when used as a support is designated as AKT-2.

Embodiment 3

[0025] These examples illustrate the relationship between AKT-2 catalyst storage time and its catalytic activity when stored in absolute ethanol.

[0026] A follow-up test has been done on the preservation of the AKT-2 catalyst, and the results are as attached Figure 4 shown. After being sealed and stored at room temperature for 30 days, the conversion rate of the catalyst to raw materials and the selectivity to cis-pinane are well maintained.

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Abstract

Silicon sol supported amorphous Ni is used as a precursor for reducing crystal nano Ni, and special magnetic Fe3O4 powder is used as a carrier of nano metal Ni. In the process of forming crystal nano Ni, the magnetic carrier plays a role in regulating and controlling the feature of crystal nano Ni, and self-assembly of the nano Ni crystal is realized, so that needle-like Ni nano wires with similar one-dimensional structure are formed. When the catalyst is applied in the preparation of cis pinane by alpha-pinene selective hydrogenation, the hydrogenation activity is inspected, and the result shows that the selectivity of the cis pinane is obviously improved through the catalyst compared with commercial Raney Ni.

Description

technical field [0001] The invention relates to a new method for preparing a composite nano-nickel catalyst supported by a magnetic carrier. Amorphous Ni supported on silica sol was used as the precursor of reduced crystalline nano-Ni, and a magnetic Fe 3 o 4 As a carrier, a crystalline nano-nickel catalyst with a needle-like special shape was prepared by combining the chemical reduction method with the electroless plating method. This type of catalyst exhibits better catalytic performance than framework nickel in the selective hydrogenation of α-pinene to cis-pinane. Background technique [0002] The main components of turpentine are α-pinene and β-pinene. The cis-pinane produced by catalytic hydrogenation has a wide range of uses in the terpenoid fragrance industry, especially in the preparation of linalool and dihydromyrcene. Pinane is an indispensable and important intermediate. Since the hydrogenation of α-pinene and β-pinene is mainly carried out on the side of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J35/02C07C13/40C07C5/03
Inventor 闫洪王广柏李若愚邱大鹏高志国陶克毅
Owner TIANJIN ANKAITE CATALYST
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