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A kind of hydrotalcite-based composite catalyst and its preparation method and application

A composite catalyst, hydrotalcite-based technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of difficult separation and reuse of homogeneous catalysts, and unsatisfactory catalytic effect

Active Publication Date: 2021-01-15
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Polyoxometalate clusters, referred to as polyacids, are homogeneous catalysts, which are widely used in the desulfurization field because of their high-efficiency desulfurization performance. However, homogeneous catalysts are difficult to separate and reuse, making them in industrial applications In order to overcome the above shortcomings of homogeneous catalysts, researchers loaded polyacids on solid materials such as titanium dioxide, silica, and molecular sieves, which improved the uniformity of polyacid dispersion and formed catalytic catalysts. higher heterogeneous catalyst
[0003] Although the heterogeneous catalysts currently used have good catalytic performance, in the actual desulfurization application, more oxidants are still needed, and the oxygen-sulfur ratio is as high as 8:1, and the catalytic effect is still not ideal.

Method used

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  • A kind of hydrotalcite-based composite catalyst and its preparation method and application
  • A kind of hydrotalcite-based composite catalyst and its preparation method and application
  • A kind of hydrotalcite-based composite catalyst and its preparation method and application

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preparation example Construction

[0046] The present invention provides a method for preparing the hydrotalcite-based composite catalyst described in the technical solution, comprising the steps of:

[0047] (1) Mix the multivalent metal salt solution with an organic base to obtain an alkaline mixed solution; the multivalent metal salt solution includes divalent metal cations and trivalent metal cations, and the divalent metal cations and trivalent metal cations are The molar ratio is 2~3.5:1;

[0048] The pH value of the alkaline mixed solution is 8-9;

[0049] (2) Under a protective atmosphere, mix the alkaline mixed solution obtained in the step (1) with the ammonium hexamolybdate salt solution to obtain a pre-reaction solution; The molar ratio is 4~7:1;

[0050] (3) Under a protective atmosphere, the pre-reaction liquid obtained in the step (2) is subjected to a hydrothermal reaction to obtain a hydrotalcite-based composite catalyst; the temperature of the hydrothermal reaction is 70 to 90°C, and the hyd...

Embodiment 1

[0086] Dissolve 1.25g of sodium molybdate in 3mL of water, and use 1.0mL6mol·L -1 The HCl solution was adjusted to pH 4.5, and then 0.80 g (n-C 4 h 9 ) 4 NCl, filter; wash twice with distilled water, ethanol respectively, obtain the isopolyacid of molybdenum ([n-(C 4 h 9 ) 4 N] 4 [Mo 8 o 26 ]). Take 0.56g[n-(C 4 h 9 ) 4 N] 4 [Mo 8 o 26 ] was dissolved in 30mL acetonitrile, and 0.17gBiCl was added 3 , reflux at 70°C for 20min, cool and stand for 10h to obtain yellow crystals, filter and wash twice with distilled water to obtain tetrabutylamine hexamolybdate ([n-(C 4 h 9 ) 4 N] 2 [Mo 6 o 19 ], abbreviated (TBA) 2 [Mo 6 o 19 ]). Under nitrogen protection, 0.96g [n-(C 4 h 9 )4 N] 2 [Mo 6 o 19 ] was dissolved in 20mL of ethanol to obtain a polymolybdate solution.

[0087] Under nitrogen protection, magnesium nitrate and aluminum nitrate were dissolved in deionized water according to the molar ratio of magnesium ions and aluminum ions in the amount of 3...

Embodiment 2

[0092] Using the hydrotalcite-based composite catalyst obtained in Example 1, the catalytic performance of the hydrotalcite-based composite catalyst was tested according to the conditions of Example 1, except that the amount of the hydrotalcite-based composite catalyst was 0.02 g.

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Abstract

The invention belongs to the technical field of catalysts. Specifically, it provides a hydrotalcite-based composite catalyst and its preparation method and application. The invention uses hydrotalcite with a lamellar structure as the matrix of the catalyst, and utilizes metal cations between the hydrotalcite layers and hexagonal The molybdate ions are bonded so that the hexamolybdate ions as the active component are uniformly loaded between the hydrotalcite layers. The hydrotalcite-based composite catalyst provided by the present invention can be used for extraction catalytic oxidative desulfurization reaction, and when applied, can achieve efficient removal of sulfur-containing substances in oil under the condition that the oxygen-sulfur ratio is reduced to 2 to 4:1.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a hydrotalcite-based composite catalyst and its preparation method and application. Background technique [0002] In recent years, the impact of vehicle exhaust emissions on environmental pollution, human health and social development has become increasingly serious, which has inspired scientists to explore more effective catalysts to reduce the content of sulfur compounds in fuel. Polyoxometalate clusters, referred to as polyacids, are homogeneous catalysts, which are widely used in the desulfurization field because of their high-efficiency desulfurization performance. However, homogeneous catalysts are difficult to separate and reuse, making them in industrial applications In order to overcome the above shortcomings of homogeneous catalysts, researchers loaded polyacids on solid materials such as titanium dioxide, silica, and molecular sieves, which improved the u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/28B01J23/887B01J35/10B01J37/10C10G27/04C10G27/12C10G53/04
CPCC10G27/04C10G27/12C10G53/04B01J23/007B01J23/28B01J23/8873B01J37/10B01J35/613B01J35/633B01J35/647
Inventor 张宏郭宇付佳伟马雯雯
Owner NORTHEAST NORMAL UNIVERSITY