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Method for preparing titanium dioxide nanobelt load thermometal integral catalyst

A monolithic catalyst, titanium dioxide technology, applied in the direction of metal/metal oxide/metal hydroxide catalysts, preparation of organic compounds, physical/chemical process catalysts, etc., can solve single-supported metal catalysts and non-supported alloys Materials, poor selectivity, complicated process, etc., to achieve the effects of easy recycling, improved catalytic activity, and uniform particle distribution

Inactive Publication Date: 2014-09-03
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, these studies above all focus on a single supported metal catalyst and an unsupported alloy material, and the supported alloy particles cannot reach nanometer size and uniform distribution.
In the existing reports, the method of preparing alloy-supported catalysts mostly adopts the impregnation method, which is complicated in process, and the product is not easy to separate, and the loading capacity is small.
In addition, the catalysts prepared in the existing reports have low catalytic efficiency, poor selectivity, easy sintering, and most importantly, poor stability during the catalytic reaction process, making it difficult to meet long-term catalytic requirements.
[0007] Preparation of supported catalysts by photodeposition-in-situ replacement method, especially bimetallic catalysts supported on titania nanobelts and their monolithic catalysts have not been reported yet

Method used

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  • Method for preparing titanium dioxide nanobelt load thermometal integral catalyst
  • Method for preparing titanium dioxide nanobelt load thermometal integral catalyst
  • Method for preparing titanium dioxide nanobelt load thermometal integral catalyst

Examples

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Embodiment 1

[0042] A method for preparing a titania nanobelt-supported bimetallic monolithic catalyst, comprising the steps of:

[0043](1) Evenly disperse 0.1g of titanium dioxide in 20ml of 10M sodium hydroxide solution, and react with alkaline heat at 200°C for 48 hours in a constant temperature drying oven to obtain sodium titanate nanoribbons; then mix with 1000ml of 0.1M hydrochloric acid Perform ion exchange to obtain titanate nanobelts, and then calcinate titanate nanobelts in a muffle furnace at 600°C for 2 hours to obtain titanium dioxide nanobelts;

[0044] (2) Take 0.1g of titanium dioxide nanobelts prepared in step (1), and evenly disperse them in 10mL of absolute ethanol, and disperse them uniformly by ultrasonic to obtain a titanium dioxide ethanol suspension; take 0.05g of silver nitrate and dissolve them in 10mL of absolute ethanol , to obtain an ethanol solution of silver nitrate; after mixing the titanium dioxide ethanol suspension and the ethanol solution of silver nit...

Embodiment 2

[0050] A method for preparing a titania nanobelt-supported bimetallic monolithic catalyst, comprising the steps of:

[0051] (1) Evenly disperse 0.1g of titanium dioxide in 40ml of 12M sodium hydroxide solution, and react with alkaline heat at 220°C for 72 hours in a constant temperature drying oven to obtain sodium titanate nanoribbons, and then mix it with 1000ml of 0.2M hydrochloric acid Ion exchange to obtain titanate nanobelts, and then calcinate titanate nanobelts in a muffle furnace at 700°C for 3 hours to obtain titanium dioxide nanobelts;

[0052] (2) Take 0.1g of titanium dioxide nanobelts prepared in step (1), disperse them evenly in 20mL of absolute ethanol, and disperse them uniformly by ultrasonic to prepare a titanium dioxide ethanol solution; dissolve 0.05g of silver nitrate in 20mL of absolute ethanol to prepare Obtain the ethanol solution of silver nitrate; after mixing the titanium dioxide ethanol solution and the ethanol solution of silver nitrate evenly, i...

Embodiment 3

[0057] A preparation method of titanium dioxide nanobelt-supported bimetal monolithic catalyst, the steps are as follows:

[0058] (1) Disperse 0.1g of titanium dioxide evenly in 10ml of 8M sodium hydroxide solution, and react with alkaline heat at 180°C for 24 hours in a constant temperature drying oven. Sodium titanate nanobelts were obtained, and ion exchange was performed in 1000mL of 0.05M hydrochloric acid to obtain titanate nanobelts, and titanate nanobelts were calcined in a muffle furnace at 500°C for 1 hour to obtain titanium dioxide nanobelts.

[0059] (2) Take 0.1g of titanium dioxide nanobelts and disperse them evenly in 5mL of absolute ethanol, and disperse evenly by ultrasonic. Take 0.05g of silver nitrate and dissolve it in 5mL of absolute ethanol. After mixing the above two solutions evenly, irradiate for 1 min under a 200W xenon lamp to obtain a dark green suspension. The obtained suspension was centrifuged at 1000 r / min for 3 min, washed twice with absolut...

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Abstract

The invention relates to a method for preparing a titanium dioxide nanobelt load thermometal integral catalyst. The method comprises the following steps of: depositing a large number of silver nanoparticles on the surface of a titanium dioxide nanobelt by a photodeposition method, carrying out in situ substitution reaction in chloroauric acid solution to obtain a thermometal load type catalyst, and finally carrying out suction filtration and film pressing on the catalyst to prepare the titanium dioxide nanobelt load thermometal integral catalyst. Particles on the surface of the titanium dioxide nanobelt load thermometal integral catalyst prepared by the invention are uniform in distribution and relatively small in particle size. The titanium dioxide nanobelt load thermometal integral catalyst is quantized and controllable in composition, has high catalytic activity, high selectivity and high stability, and is easy to recover and recycle. In addition, the method is suitable for large-scale industrial applications.

Description

technical field [0001] The invention relates to a method for preparing a titanium dioxide nanobelt-supported bimetallic monolithic catalyst, in particular to a titanium dioxide nanobelt-supported titanium dioxide nanobelt with adjustable composition that can be used in processes such as selective oxidation of alcohols, CO oxidation, and electrocatalytic oxidation of methanol and formic acid. The invention discloses a bimetallic catalyst and a method for preparing the monolithic catalyst, belonging to the technical field of chemical catalysts. Background technique [0002] Photodeposition is a common loading method, that is, under certain conditions, a metal salt solution is reduced to a simple metal in the presence of semiconductor substances and light. At present, most of the materials deposited by this method are single metal supports of semiconductors. The semiconductor materials are added to the metal salt solution with hole recombination agents, and the supported materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/52C07C47/54C07C45/38
Inventor 许效红管瑜刘宏
Owner SHANDONG UNIV