Precious metal catalyst as well as preparation method and application thereof

A precious metal catalyst, silicon oxide technology, used in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc. Active components are easy to lose, and catalysts are difficult to use in practice, so as to avoid hydration, improve selectivity and stability, and improve activity and stability.

Inactive Publication Date: 2020-07-24
SHANXI LUAN MINING GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the researchers did not consider the interaction between the subsequent carrier and the catalyst, resulting in a relatively weak force between the catalyst carrier and the active component, resulting in the easy loss of the active component of the catalyst, which in turn reduces the activity of the catalyst, making it difficult for the catalyst to be practically applied.

Method used

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  • Precious metal catalyst as well as preparation method and application thereof
  • Precious metal catalyst as well as preparation method and application thereof
  • Precious metal catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] 1) Preparation method of hydrophobic silica carrier

[0057] The organosilicon sol with a solid content of 20% was prepared into spherical silica powder by means of centrifugal spray drying. Wherein, the average particle size of the nano-silicon oxide in the organosilicon sol is 30nm, the surface of the nano-silicon oxide particles is mainly methyl groups, and the selected solvent is methyl ethyl ketone. The control parameters of concrete centrifugal spray drying are as follows:

[0058] a, the drying gas of spray drying is selected as nitrogen;

[0059] b. Control the rotation speed of spray drying to be 10000r / min;

[0060] c. The inlet temperature of spray drying is 160°C, and the outlet temperature is maintained between 90-100°C.

[0061] 2) Preparation of hydrophobic catalyst

[0062] Take 5 g of the above-mentioned spherical silica powder with a particle size of 120-400 mesh, and then add 6.5 g of palladium acetate organic solution with a concentration of 3 mg...

Embodiment 2

[0067] 1) Preparation method of hydrophobic catalyst

[0068] Weigh 50 g of organosilicon sol with a solid content of 20%. Among them, the average particle size of the nano-silica in the organosilicon sol is 30nm, the surface of the nano-silica particles is mainly methyl groups, and the selected solvent is methyl ethyl ketone. Add 13.0 g of palladium acetate organic solution with a concentration of 3 mg / ml to the above organosilicon sol, wherein the solvent of palladium acetate is methanol solution, and then stir at room temperature for 30 min.

[0069] The above organosilicon sol mixed with active components was prepared into spherical catalyst particles by centrifugal spray drying, and the control parameters of centrifugal spray drying were as described in Example 1.

[0070] The sample after centrifugal spray drying was roasted at 300°C for 2 hours to obtain the oxidized complex II;

[0071] 2) Reduction treatment

[0072] Put the above oxidized complex II into a tube fu...

Embodiment 3

[0075] Preparation of samples 3#~5#

[0076] The difference between the preparation method of sample 3# and the preparation method of sample 1# is that the solid content of the organosilicon sol is 15wt%, the average particle size of the nano-silica in the organosilicon sol is 65nm, and the surface of the nano-silicon oxide particles is mainly phenyl 2-methylpropionate palladium(II) with a concentration of 15mg / ml is dissolved in methanol, the organic solution of 2-methylpropionate palladium(II) is 6.5g, and the temperature of sintering I is 200°C, which is denoted as Sample 3#. In sample 3#, the mass content of palladium in the noble metal catalyst is 1.9wt%.

[0077] The difference between the preparation method of sample 4# and the preparation method of sample 1# is that the solid content of the organosilicon sol is 38wt%, the average particle size of the nano-silica in the organosilicon sol is 20nm, and the surface of the nano-silicon oxide particles is mainly acetyl 6.5...

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Abstract

The invention discloses a noble metal catalyst as well as a preparation method and application thereof. The catalyst comprises a carrier and an active component, and the active component is loaded onthe carrier. The carrier comprises silicon oxide modified by organic groups. The active component comprises an active element, and the active element is selected from at least one of Pd and Pt. According to the hydrogenation catalyst, organic groups are introduced into the silicon oxide carrier to adjust the hydrophobicity and polarity of the carrier, the hydration effect of water in a hydrogenation working solution on the active component is avoided, the desorption effect of anthrahydroquinone serving as a species after anthraquinone hydrogenation is further improved, and the selectivity andstability of the hydrogenation catalyst are improved. The catalyst provided by the invention can be used in the process of producing hydrogen peroxide by slurry reactor anthraquinone catalytic hydrogenation, and the hydrogenation catalyst shows very high hydrogenation selectivity and stability.

Description

technical field [0001] The application relates to a noble metal catalyst and its preparation method and application, belonging to the technical field of chemical production. Background technique [0002] The final product of hydrogen peroxide decomposition during use is mainly water, which does not produce secondary pollutants and is an environmentally friendly chemical. As a green chemical product, hydrogen peroxide can be used as an oxidant, bleach, disinfectant, polymer initiator, etc., and is widely used in chemical synthesis, papermaking, textile, environmental protection, food, electronics, aerospace and other industries. [0003] At present, the anthraquinone method is the main method for the production of hydrogen peroxide in the world. In the anthraquinone hydrogenation process, the most important step is the hydrogenation process of anthraquinone, and the solid catalyst has a huge impact on the energy consumption and material consumption of the anthraquinone hydro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01J35/10C01B15/023
CPCB01J23/44B01J35/1019B01J35/1042B01J35/1061B01J35/0013C01B15/023
Inventor 刘俊义王树东崔艳斌苏宏久郭翔杨晓野付鹏兵李大卫吴伟严华刘志马毅
Owner SHANXI LUAN MINING GRP
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