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PtFe-SiO2 nano composite material as well as preparation method and application thereof

A nanocomposite material, ptfe-sio2 technology, applied in chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve the problems of large size, low atom utilization, easy agglomeration and deactivation, etc., and achieve high selectivity and stability effects

Pending Publication Date: 2022-04-22
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although the traditional Pt-based catalysts for propane dehydrogenation to propylene have good catalytic activity, they face factors such as excessive size, low atom utilization, and easy agglomeration and deactivation at high temperatures, resulting in unsatisfactory selectivity and stability.

Method used

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  • PtFe-SiO2 nano composite material as well as preparation method and application thereof
  • PtFe-SiO2 nano composite material as well as preparation method and application thereof
  • PtFe-SiO2 nano composite material as well as preparation method and application thereof

Examples

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preparation example Construction

[0027] This application also provides PtFe-SiO 2 The preparation method of nanocomposite material, comprises the following steps:

[0028] Mix iron source, platinum source and water to obtain mixed solution A;

[0029] Mixing the mixed solution A with fumed silica to obtain a gel B;

[0030] The gel material B is ground, dried, calcined, and finally reduced to obtain PtFe-SiO 2 nanocomposites.

[0031] In this application provided the PtFe-SiO 2 In the preparation method of nanocomposites, the iron source and the platinum source are iron sources and platinum sources well known to those skilled in the art, and the present application is not particularly limited. For example, the iron source is selected from nonahydrate One or more of ferric nitrate, ferric chloride hexahydrate and ferric sulfate hydrate, and the platinum source is selected from one or more of tetraammine platinum nitrate, chloroplatinic acid and ammonium chloroplatinate. The ratio of the iron source, the p...

Embodiment 1

[0039] At room temperature, take 500 mg of gas-phase SiO 2 Put it aside for use, dissolve 20.2mg of ferric nitrate nonahydrate and 1.96mg of tetraammine platinum nitrate in 1mL of deionized water, ultrasonically evenly, and drop the mixed solution into the gas phase SiO 2 and then use a glass rod to stir evenly to obtain a gel, place the gel overnight to dry and grind it to a solid powder, dry the solid powder in an oven at 60°C for 12 hours, and put the dried solid powder into a muffle furnace Calcination treatment, the calcination temperature is 573K, the heating rate is 5K / min, the calcination time is 1h, and the calcined solid powder is heated in 10% H 2 Under the atmosphere condition of +90% Ar (volume percent), reduction treatment is carried out, the reduction temperature is 873K, the heating rate is 10K / min, and the reduction time is 3h, and the SiO in the gas phase is obtained. 2 impregnated Pt-Fe nanocatalysts.

[0040] The composition of the catalyst that above-men...

Embodiment 2

[0042] At room temperature, take 500 mg of gas-phase SiO 2 Put it aside for use, dissolve 1.96mg tetraammineplatinum nitrate in 1mL deionized water, sonicate evenly, and drop the mixed solution evenly into the gas phase SiO 2 and then use a glass rod to stir evenly to obtain a gel, place the gel overnight to dry and grind it to a solid powder, dry the solid powder in an oven at 60°C for 12 hours, and put the dried solid powder into a muffle furnace Calcination treatment, the calcination temperature is 573K, the heating rate is 5K / min, the calcination time is 1h, and the calcined solid powder is heated in 10% H 2 Under the atmosphere condition of +90% Ar (volume percent), reduction treatment is carried out, the reduction temperature is 873K, the heating rate is 10K / min, and the reduction time is 3h, and the SiO in the gas phase is obtained. 2 impregnated Pt nanocatalysts.

[0043] The composition of the catalyst that above-mentioned preparation method obtains is 0.2wt%Pt / SiO ...

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Abstract

The invention provides a PtFe-SiO2 nano composite material. The PtFe-SiO2 nano composite material is composed of a gas phase SiO2 carrier and Pt-Fe nano particles loaded on the surface of the gas phase SiO2 carrier. The invention further provides a preparation method of the PtFe-SiO2 nano composite material. The invention also provides an application of the PtFe-SiO2 nano composite material in a direct dehydrogenation reaction of propane. The composite material provided by the invention realizes a heterogeneous structure, and dispersed Pt sites can be obtained based on the action of the aid Fe, so that the nano composite material has very high selectivity and stability in catalysis of direct dehydrogenation reaction of propane.

Description

technical field [0001] The invention relates to the technical field of energy catalysis, in particular to PtFe-SiO 2 Nanocomposites, their preparation methods and their applications. Background technique [0002] Propylene is an important chemical raw material that can be used to produce polypropylene, acrolein, polyacrylonitrile and propylene oxide. Propane, as the main component of shale gas, becomes easier to obtain with the development of shale gas extraction technology. In recent years, with the aggravation of the energy crisis, the direct dehydrogenation of propane (PDH) to propylene is a very promising chemical production route, and has received widespread attention in recent years. However, this reaction is an endothermic reaction. In order to obtain a better conversion rate, the required temperature is usually higher. How to react safely, reduce energy consumption, improve the selectivity of the catalyst and maintain the long-term stability of the catalyst is the ...

Claims

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Application Information

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IPC IPC(8): B01J23/89C07C5/333C07C11/06
CPCB01J23/8906C07C5/3337C07C11/06C07C2523/89B01J35/399B01J35/23Y02P20/52
Inventor 曾泽昆罗雷曾杰
Owner UNIV OF SCI & TECH OF CHINA
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