A kind of palladium-alumina-cordierite composite material and its preparation method and application

A composite material, cordierite technology, applied in the field of palladium-alumina-cordierite composite materials and its preparation, can solve the problem of inability to achieve high dispersion of active components, easy loss of active components, and the interaction between active components and coatings Weakness and other problems, to achieve the effect of prolonging life, simplifying the preparation process, and high degree of palladium dispersion

Active Publication Date: 2021-03-16
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this impregnation method tends to cause the active components to aggregate into large particles, which cannot achieve high dispersion of the active components, and due to the weak force between the active components and the coating, the active components are easily lost during the catalytic reaction.

Method used

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  • A kind of palladium-alumina-cordierite composite material and its preparation method and application
  • A kind of palladium-alumina-cordierite composite material and its preparation method and application
  • A kind of palladium-alumina-cordierite composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Put the preconditioned cordierite matrix into the reactor, add active agent F127, aluminum isopropoxide, magnesium nitrate hexahydrate, PdCl 2 , HCl, citric acid, ethanol synthesis mother liquor, wherein mass ratio F127: aluminum isopropoxide: magnesium nitrate hexahydrate: PdCl 2: HCl: citric acid: ethanol = 1: 1.1: 0.275: 0.006: 1.8: 0.7: 11 mother liquor 70 ml, seal the reactor and react at 120°C for 2 days, take it out, wash, dry, and calcinate to get this product Invention of said composite material.

[0039] figure 1 In order to obtain the X-ray diffraction pattern of the composite material (deducting the diffraction peak of the cordierite matrix), it can be determined that the Pd-Al 2 o 3 -cordierite composite material, and in Pd-Al 2 o 3 The active layer contains MgSi x o 2x+1 (x=1, 2, 3) species, whose corresponding diffraction peak is located at 23°, denoted as Pd-Al 2 o 3 -M-1; It is known by weighing: Pd and Al in the composite material 2 o 3 The ...

Embodiment 2

[0044] Using the composite material prepared in Example 1 as a raw material, repeat the steps in Example 1 twice, and the prepared Pd-Al 2 o 3 - The cordierite composite material is denoted as Pd-Al 2 o 3 -M-2. It is equivalent to that the product obtained in Example 2 has undergone a total of 3 reactions starting from the pretreated cordierite.

[0045] Figure 4 In order to obtain the X-ray diffraction pattern of the composite material (deducting the diffraction peak of the cordierite matrix), it can be determined that the Pd-Al 2 o 3 -cordierite composite material, and in Pd-Al 2 o 3 The active layer contains MgSi x o 2x+1 (x=1, 2, 3) Species. After weighing, it is known that Pd and Al are contained in the composite material 2 o 3 The total mass percentage is 2.58%, wherein the mass percentage of Pd metal is 0.50%, the mass percentage of cordierite matrix is ​​97.42%, MgSi x o 2x+1 The mass ratio of (x=1, 2, 3) species relative to the porous alumina was 5.0%. ...

Embodiment 3

[0050] Put the preconditioned cordierite matrix into the reactor, add surfactant F127, aluminum isopropoxide, magnesium nitrate hexahydrate, PdCl 2 , HCl, citric acid, ethanol synthesis mother liquor, the mass ratio is F127: aluminum isopropoxide: magnesium nitrate hexahydrate: PdCl 2 : HCl: citric acid: ethanol = 1: 1.1: 0.275: 0.006: 1.8: 0.7: 11 synthetic solution 70 ml, seal the reactor and place it in an oven at 120°C for 4 days, take it out, wash, dry and calcinate , the resulting composite material is denoted as Pd-Al 2 o 3 -M-3.

[0051] Figure 7 In order to obtain the X-ray diffraction pattern of the composite material (deducting the diffraction peak of the cordierite matrix), it can be determined that the Pd-Al 2 o 3 -cordierite composite material, and in Pd-Al 2 o 3 The active layer contains MgSi x o 2x+1 (x=1, 2, 3) Species. Known by weighing: Pd and Al in the composite material 2 o 3 The total mass percentage is 0.99%, of which Pd metal accounts for P...

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Abstract

The invention discloses a palladium-alumina-cordierite composite material. The palladium-alumina-cordierite composite material comprises: a cordierite substrate, which has a plurality of honeycomb pore channels; and a porous alumina layer grown on the surfaces of the honeycomb pore channels, wherein metal palladium particles are dispersed on the porous alumina layer, and the porous alumina layer contains MgSi<x>O<2x+1> (wherein x is equal to 1, 2 or 3) species. The invention also discloses a preparation method for the palladium-alumina-cordierite composite material. The preparation method comprises the following steps: soaking the cordierite substrate in a synthetic mother liquid in a reactor, then closing the reactor is sealed and carrying out a reaction at 110-140 DEG C for 2-4 days. According to the preparation method, the growth of the aluminum oxide layer and the loading and dispersing process of palladium particles are integrated, so preparation process is simplified, the aluminum oxide layer has high bonding strength, and the level of palladium dispersion is high. The palladium-alumina-cordierite composite material can increase hydrogenation rate in multiples, enhance targetproduct selectivity and prolong catalyst life when used for catalytical hydrogenation of anthraquinone and its substitutes.

Description

technical field [0001] The invention belongs to the field of catalysts, in particular to a palladium-alumina-cordierite composite material and its preparation method and application. Background technique [0002] Hydrogen peroxide, also known as hydrogen peroxide, is an important chemical raw material. The anthraquinone method is currently the main method for producing hydrogen peroxide at home and abroad. Compared with other preparation methods, it has the advantages of low energy consumption, low cost, mature technology, and easy large-scale production. The technical principle of the production of hydrogen peroxide by anthraquinone method is: dissolve the anthraquinone substitute in an appropriate solvent, use hydrogen to reduce the anthraquinone substitute in the working solution to the corresponding anthrahydroquinone in the presence of a catalyst, and then anthracene hydrogen The quinones are oxidized by oxygen to anthraquinone substitutes and hydrogen peroxide. The o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/44B01J37/02C07C37/07C07C39/12
CPCB01J23/58B01J35/006B01J35/0066B01J37/0217C07C37/07
Inventor 袁恩先王莅刘国柱张香文邹吉军王庆法李国柱潘伦
Owner TIANJIN UNIV
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