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Preparation method of loading type bimetallic catalyst with highly-dispersing active center

A metal catalyst and active center technology, which is applied in the control field of uniform dispersion of supported catalyst metal centers and auxiliary metals, can solve the problems of difficult realization, difficult operation, and reduced active center amount, and achieves uniform dispersion, high dispersion and high isomerism. selective effect

Active Publication Date: 2014-11-19
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
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Problems solved by technology

But in doing so, the covered Pt cannot participate in the reaction, resulting in a decrease in the amount of effective active centers
At present, a lot of research has been done on improving the dispersion of metal active centers, mainly in the following ways: (1) using chemical vapor deposition, but this method is difficult to operate, especially difficult to achieve in industrial production processes

Method used

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  • Preparation method of loading type bimetallic catalyst with highly-dispersing active center

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Embodiment 1

[0025] Zinc sulfate, gallium nitrate, and hexamethylenetetramine were dissolved in deionized water to form solution A. Dip aluminum oxide into solution A, transfer it to a high-pressure reactor, and crystallize at 130°C for 6 hours. The molar ratio of zinc sulfate, gallium nitrate, hexamethylene tetramine and aluminum oxide is 150:8:800. After the reaction, the reaction solution was suction-filtered, washed until the eluent was neutral, and the obtained hydrotalcite-modified aluminum oxide was dried at 80° C. for 12 hours. The high-valent metals required by the hydrotalcite laminates are supplemented by the aluminum dissolved by the aluminum oxide during the reaction process.

[0026] Step B: Dissolve platinum acetylacetonate in a certain amount of deionized water or other solvents to form solution B, immerse the aluminum oxide modified by hydrotalcite obtained in step (1) in solution B, let it stand for 12h, and then Dry at 80°C for 12h. The molar ratio of platinum acetyla...

Embodiment 2

[0031] Nickel nitrate, indium nitrate and ammonia water were dissolved in deionized water to form solution A. Dip aluminum oxide into solution A, transfer it to a high-pressure reactor, and crystallize at 160°C for 2 hours. The molar ratio of nickel nitrate, indium nitrate, hexamethylene tetramine and aluminum oxide is 50:5:50:1500. After the reaction, the reaction solution was suction-filtered, washed until the eluent was neutral, and the obtained hydrotalcite-modified aluminum oxide was dried at 80° C. for 12 hours. The high-valent metals required by the hydrotalcite laminates are supplemented by the aluminum dissolved by the aluminum oxide during the reaction process.

[0032] Step B: Dissolve sodium chloroplatinate in a certain amount of deionized water or other solvents to form solution B, immerse the hydrotalcite-modified aluminum oxide obtained in step (1) in solution B, let stand for 12h, and then Dry at 80°C for 12h. Wherein the molar ratio of sodium chloroplatinat...

Embodiment 3

[0037] Step A: Combine Magnesium Nitrate with Urea

[0038] Magnesium nitrate, gallium nitrate, and urea were dissolved in deionized water to form solution A. Dip aluminum oxide into solution A, transfer it to a high-pressure reactor, and crystallize at 80°C for 12 hours. The molar ratio of magnesium nitrate, gallium nitrate, urea and aluminum oxide is 30:1:200:100. After the reaction, the reaction solution was suction-filtered, washed until the eluent was neutral, and the obtained hydrotalcite-modified aluminum oxide was dried at 80° C. for 12 hours. The high-valent metals required by the hydrotalcite laminates are supplemented by the aluminum dissolved by the aluminum oxide during the reaction process.

[0039] Step B: Hexaaminoplatinum nitrate is dissolved in a certain amount of deionized water or other solvents to form solution B, and the hydrotalcite-modified Al obtained in step (1) 2 o 3 Immerse in solution B, let stand for 12h, then dry at 80°C for 12h. The molar r...

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Abstract

The invention discloses a preparation method of a loading type bimetallic catalyst with a highly-dispersing active center and belongs to the technical field of active center structure control of the loading type catalyst. In the catalyst, the active center is loaded on aluminium oxide modified in situ by hydrotalcite, and a trivalent additive metal is introduced into a hydrotalcite layer plate by utilizing the adjustable characteristic of metal cations of the hydrotalcite layer plate. When the hydrotalcite layer plate is topologically transformed into the layered bimetallic oxide in the process of roasting reduction, due to the confinement action of lattices of the hydrotalcite layer plate, the additive metal embedded into the hydrotalcite layer plate is controlled to grow in the process of roasting reduction. The control for the dispersing state of the active center of the metal is realized by the lattice induction action of the platinum at the active center of the metal on the layer plate by the hydrotalcite layer plate.

Description

technical field [0001] The invention belongs to the technical field of controlling the structure of the active center of the supported catalyst, and in particular provides a method for controlling the uniform dispersion of the metal center of the supported catalyst and the auxiliary metal. Background technique [0002] In the process of the development of modern society, petroleum has become one of the most important energy sources in our life. With the development of society, people's demand for energy is increasing, while oil reserves are decreasing year by year. "Efficient utilization of oil resources" has become the most critical issue facing all mankind. Gasoline, as an important petroleum product, is playing a more and more important role in modern life. The protection of the environment has also become another key issue of concern to all human beings in the process of social development. As the requirements for environmental protection become higher and higher, the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/62B01J23/89C10G35/09
Inventor 何静王文龙安哲
Owner BEIJING UNIV OF CHEM TECH
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