Platinum-modified indium-based oxide catalyst as well as preparation method and application thereof

A catalyst and oxide technology, which is applied in the field of catalyst technology and energy chemical industry, can solve the problems of poor catalytic activity and stability of indium-based catalysts, harsh reaction conditions of indium-based catalysts, unsatisfactory catalytic activity, etc., and achieve good application prospects, Excellent catalytic performance, low requirement for reaction conditions

Active Publication Date: 2022-04-29
SHANGHAI UNIV OF ENG SCI
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  • Abstract
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Problems solved by technology

However, the reaction conditions of indium-based catalysts are relatively harsh. For example, a hexagonal indium oxide reported in Shanghai Institute for Advanced Study CN 110479235 A patent requires a higher reaction temperature (360°C) and a higher proportion of hydrogen [n(H 2 ) / n(CO 2 )=6] to have a good catalytic performance
In addition, indium-based catalysts have poor catalytic activity and stability and are prone to deactivation at high temperatures.
It was reported (DOI:10.1039 / d0gc01597k) that metal Pt was loaded on In 2 o 3 Although the stability of the catalyst has been improved, the selectivity at its optimum reaction temperature (300°C) is only 54%, and the catalytic activity is not ideal.
[0006] Therefore, how to reduce the reaction temperature while improving the catalytic activity and stability of catalysts still faces great challenges.

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  • Platinum-modified indium-based oxide catalyst as well as preparation method and application thereof
  • Platinum-modified indium-based oxide catalyst as well as preparation method and application thereof
  • Platinum-modified indium-based oxide catalyst as well as preparation method and application thereof

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preparation example Construction

[0046] A method for preparing a platinum-modified indium-based oxide catalyst. The indium salt is indium nitrate tetrahydrate, the precipitating agent is urea, and the platinum precursor is chloroplatinic acid. The method comprises the following steps:

[0047] (1) Preparation of plate-like In 2 o 3 Carrier:

[0048] After mixing water and alcohol, solution 1 is obtained, and indium salt is dissolved in solution 1 to obtain solution 2;

[0049] In addition, water and alcohol are mixed to obtain solution 3, and then the precipitating agent is dissolved in solution 3 to obtain solution 4;

[0050] Under stirring state, solution 4 is added in solution 2, after stirring, carry out hydrothermal reaction; During hydrothermal reaction, the mass ratio of indium salt and precipitation agent is (4-5): 4; The volume ratio of ethanol and water For (2-6): 1; the temperature of hydrothermal reaction is 115-125 ℃, and the time is 16-18h;

[0051] After the reaction, the resulting precipi...

Embodiment 1

[0059] Preparation of indium oxide by hydrothermal method: Take 32mL of ethanol and 5mL of deionized water to make solution 1. Dissolve 4.07g of indium nitrate tetrahydrate into the above solution 1 to form solution 2. Take another 20mL of ethanol and 5mL of deionized water to make solution 3. 4.0 g of urea was dissolved in the above-mentioned solution 3 to form solution 4. Under vigorous stirring, solution 4 was added to solution 2 and stirring was continued at room temperature for 2 hours. Then the solution was taken out and put into a reaction kettle, and kept at 120° C. for 17 hours. After the reaction, the sample was taken out and washed several times with deionized water, dried at 60° C. for 12 hours, and calcined at 300° C. for 5 hours to obtain plate-shaped indium oxide.

Embodiment 2

[0061] 5 g of indium nitrate tetrahydrate was calcined at 300° C. for 5 hours to obtain amorphous indium oxide nanoparticles.

[0062] It can be seen that the adjustment of the morphology of indium oxide requires special reaction conditions. In this application, indium nitrate is used as the precursor, and by adjusting the ratio of water and alcohol in the solvent, the specific morphology is obtained by hydrothermal method at high temperature and high pressure. Indium oxide, while the hydrothermal method is often used for shape adjustment in the preparation of traditional catalysts, that is, in a sealed pressure vessel, water or alcohol is used as a solvent, and the powder is dissolved and recrystallized. The preparation method of the material.

[0063] For excellent catalytic activity, the oxygen vacancies on the surface of the catalyst in traditional CO 2 Activated as a basic site, that is, CO 2 Active sites, the increase of oxygen vacancies will be beneficial for CO 2 The...

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Abstract

The invention relates to a platinum-modified indium-based oxide catalyst as well as a preparation method and application thereof. The catalyst mainly comprises a noble metal active component Pt and an oxide carrier In2O3. The Pt / In2O3 composite catalyst is adopted, the activity of the carbon dioxide hydrogenation reaction is improved, and the carbon dioxide conversion rate larger than 15% and the methanol selectivity larger than 80% can be achieved when the catalyst is applied to the reaction for synthesizing methanol through carbon dioxide hydrogenation under high pressure. The method has the characteristics of simple process route, high selectivity, high conversion rate and high yield, the reaction conditions are mild, the raw materials are easy to obtain, and the method has a good application prospect.

Description

technical field [0001] The invention relates to the field of catalyst technology and energy chemical industry, in particular to a platinum-modified indium-based oxide catalyst and its preparation method and application. Background technique [0002] Over the past 60 years, global energy demand has grown rapidly, and man-made carbon dioxide emissions have continued to increase, leading to serious environmental problems such as climate deterioration and global warming. CO 2 Hydrogenation of methanol is a rational use of CO 2 One of the important ways, and has broad application prospects. Methanol is a clean and efficient fuel that can be used as a gasoline additive; in addition, methanol is not only used to prepare C 2 -C 4 The raw material of higher olefins is also an important raw material for the preparation of many fine chemicals such as medicine, cosmetics, polyester, etc. Therefore, the catalytic conversion of carbon dioxide to methanol has received a lot of attentio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/62B01J35/02C07C29/157C07C31/04
CPCB01J23/62B01J35/023B01J35/026C07C29/157C07C31/04Y02P20/52
Inventor 门勇史天乐刘爽王金果
Owner SHANGHAI UNIV OF ENG SCI
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