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A highly stable single-atom platinum-based catalytic material, its preparation method and its application in the purification of oxygen-containing volatile hydrocarbons

A catalytic material and highly stable technology, applied in the field of air pollution control, can solve the problems of limitation, high price, and easy agglomeration and deactivation of active centers.

Active Publication Date: 2021-03-16
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high price of precious metals and the easy agglomeration and deactivation of active centers, the prospect of further industrial application is limited.

Method used

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  • A highly stable single-atom platinum-based catalytic material, its preparation method and its application in the purification of oxygen-containing volatile hydrocarbons
  • A highly stable single-atom platinum-based catalytic material, its preparation method and its application in the purification of oxygen-containing volatile hydrocarbons
  • A highly stable single-atom platinum-based catalytic material, its preparation method and its application in the purification of oxygen-containing volatile hydrocarbons

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1 Preparation of highly stable porous molybdenum carbide carrier (MoC) by microwave-assisted synthesis

[0047] (1) Dissolve 30mmoL of ammonium molybdate tetrahydrate in 90mL of deionized water, and stir at 700rpm for 10min to fully dissolve;

[0048] (2) Subsequently, 0.65 g of polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer (P123) was added to the transparent solution obtained in step (1), and stirred at 900 rpm for 10 min.

[0049] (3) Next, add 17 mL of cis-oleyl primary amine dropwise to the solution obtained in step (2). This step helps to accelerate the nucleation process of rod-shaped molybdenum carbide, and then stir at 900 rpm for 20 min to form a light yellow transparent solution.

[0050] (4) Add pre-prepared 1 mol / L hydrochloric acid dropwise to the solution obtained in step (3) to adjust the pH of the solution so that the final pH value of the solution is between 3.5-4, and continue to stir the solution for 30 min.

...

Embodiment 2

[0053] Example 2 Prepared highly stable porous molybdenum carbide carrier (Mo 2 c)

[0054] Dissolve 30mmoL of ammonium molybdate tetrahydrate in 90mL of deionized water, and stir at 700rpm for 10min to fully dissolve; then add 0.65g of polyethylene oxide-polypropylene oxide-polyepoxide to the transparent solution Ethane triblock copolymer (P123), and stirred at 900rpm for 10min. Next, 17 mL of p-aniline was added dropwise. This step helps to accelerate the nucleation process of rod-shaped molybdenum carbide. The above solution was stirred at 900 rpm for 20 min to form a light yellow transparent solution. Add pre-prepared 1 mol / L hydrochloric acid dropwise to the above solution to adjust the pH of the solution so that the final pH value of the solution is between 6.5-8, and continue to stir the solution for 30 min. Then the mixed solution was placed in a microwave generator for heating and reflux reaction, the power of the microwave generator was set to 850W, the temperature...

Embodiment 3

[0055] Embodiment 3 builds abundant surface hydroxyl groups after adopting the hydrothermal alkali leaching method

[0056] The carrier obtained in Example 1 was dispersed in 80 mL of 0.5 mol / L potassium hydroxide solution, and stirred at 800 rpm for 30 min to make it evenly mixed. Then it was placed in a hydrothermal reaction kettle, and the temperature of the hydrothermal crystallization process was set at 90° C. for 3 hours. After the mixed solution was lowered to room temperature, it was centrifuged at 6000 rpm, washed with ethanol and deionized water, and dried to obtain a black solid powder, which was a highly stable carrier (OH-MoC) modified by surface hydroxyl groups.

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Abstract

A highly stable single-atom platinum-based catalytic material, its preparation method and its application in the purification of oxygenated volatile hydrocarbons. It uses highly stable molybdenum carbide as a carrier and builds abundant surface hydroxyl groups on the surface of the carrier through a hydrothermal alkali leaching method. The single-atom platinum active phase is stably dispersed on the molybdenum carbide carrier surface through strong interaction with surface hydroxyl groups. The single-atom platinum-based catalytic material prepared by this invention has excellent low-temperature catalytic activity and stability, and can operate at a temperature of 100-135°C and a reaction space velocity of 36000-45000h. ‑1 , realize deep purification of volatile oxygenated hydrocarbons discharged from industrial sources under the condition of oxygen concentration 10‑20vol.%. The invention greatly improves the low-temperature catalytic efficiency of the single-atom catalytic material. To a certain extent, it solves the problem of expensive cost of loaded precious metals and has good application universality.

Description

technical field [0001] The invention belongs to the technical field of air pollution control, and in particular relates to a highly stable single-atom platinum-based catalytic material and its preparation method and its application in the purification of oxygen-containing volatile hydrocarbons. Background technique [0002] Volatile Organic Compounds (Volatile Organic Compounds, VOCs) refer to organic compounds with a boiling point lower than 260°C at normal pressure, or a saturated vapor pressure exceeding 133.32Pa at room temperature (25°C), which are emitted into the air in the form of gaseous molecules The general term for all organic compounds. There are many kinds of VOCs, mainly including aliphatic hydrocarbons, oxygen-containing hydrocarbons, aromatic hydrocarbons and their derivatives, halogen-containing hydrocarbons, nitrogen-containing hydrocarbons, sulfur-containing hydrocarbons, etc. VOCs have high atmospheric chemical reactivity and are the key factor for the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/22B01J37/08B01J37/10B01J35/10B01D53/86B01D53/44
CPCB01J27/22B01J37/08B01J37/10B01D53/8687B01J35/633B01J35/615
Inventor 何炽姜泽宇建艳飞董瑞武雅妮
Owner XI AN JIAOTONG UNIV
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