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Preparation method of hydrophobic silica nano sphere-supported palladium-based catalyst

A technology of nano-silicon balls and catalysts, applied in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc. easy-to-get effect

Active Publication Date: 2017-05-31
LUOYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is difficult to precisely control the degree of hydrophobicity that the catalyst can achieve.

Method used

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  • Preparation method of hydrophobic silica nano sphere-supported palladium-based catalyst
  • Preparation method of hydrophobic silica nano sphere-supported palladium-based catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Mix NP-7, n-butanol and cyclohexane with stirring at room temperature to obtain a transparent solution A,

[0026] (2) adding ammonia dropwise to the above-mentioned transparent solution to form a microemulsion;

[0027] (3) 5.21g of methyl orthosilicate, phenyltrimethoxysilane and vinyltriethoxysilane were mixed uniformly to form a mixed solution. Under vigorous stirring, the mixed solution was added dropwise into the microemulsion. The ratio of the amount of each component in the final reaction solution (solution B) is, methyl orthosilicate: NP-7: n-butanol: cyclohexane: H 2 O: NH 3 h 2 O: phenyltrimethoxysilane: vinyltriethoxysilane = 1:1:4.5:15:16:1:0.2:0.05 and continue stirring at room temperature for 12h.

[0028] (4) After adding 10 mL of ethanol to break the emulsion, reflux washing with 50 mL of ethanol three times to remove the surfactant, and vacuum drying at 50°C to obtain nano-silicon spheres containing organic groups and reducing groups with a wat...

Embodiment 2-12

[0030] Change the addition of n-butanol, cyclohexane, water, phenyltrimethoxysilane and vinyltriethoxysilane in Example 1, and prepare hydrophobic nano silicon spheres under other conditions. The results are shown in the following table:

[0031] .

Embodiment 13-16

[0033] Change the amount of demulsification ethanol and reflux ethanol in the post-treatment process in Example 1, and do not allow temperature drying, and prepare nano-silicon spheres with other conditions unchanged. The results are shown in the table below. It can be seen from the results that the post-treatment conditions have no obvious effect on the hydrophobicity of the prepared materials.

[0034] .

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Abstract

The invention discloses a preparation method of a hydrophobic silica nano sphere-supported palladium-based catalyst. The method comprises the following steps of (1) preparing silica nano spheres with a hydrophobic group and a reduction group; and (2) reacting the silica nano spheres with palladium salt to obtain the hydrophobic silica nano sphere-supported palladium-based catalyst. According to the preparation method, a reducing agent is fixed on the surface of a carrier through an Si-C bond, Pd ions in the solution can only be reduced into Pd atoms on the surface of the carrier, the generated Pd atoms are easily gathered on the surface of the carrier to form supported nano palladium particles due to relatively high surface energy, the problem that a common chemical reduction method cannot be easily carried out on the hydrophobic surface of the carrier is overcome, the preparation process is not a high-temperature process generally adopted for hydrogen reduction, an organic group on the surface of the carrier can be well reserved. Compared with a post-grafting method in the prior art, the method disclosed by the invention has the advantage that the adding amount of the organic group can be conveniently adjusted to effectively control the hydrophobic property of the surface of the catalyst.

Description

technical field [0001] The invention relates to the technical field of metal catalysts, in particular to a method for preparing a palladium-based catalyst supported by hydrophobic nano silicon spheres. Background technique [0002] Hydrophobic supported metal catalysts tend to achieve better reaction effects than hydrophilic catalysts in catalyzing organic reactions involving water. For organic reactions where the reactants are non-polar or weakly polar substrates and the products are polar products, such as the oxidation of alkanes to alcohols and ketones, the hydrophobic surface is more conducive to the adsorption and polarity of non-polar substrates. The desorption of the product can thus effectively increase the conversion and selectivity of this type of reaction. Therefore, the preparation of hydrophobic metal-supported catalysts has attracted extensive attention. There are always some problems in the preparation of hydrophobic supported metal catalysts by using the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02
CPCB01J31/02
Inventor 杨艳良段英郑敏李东密邓冬生
Owner LUOYANG NORMAL UNIV
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