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Nano iron oxide catalyst and its synthetic method

A technology of nano-iron oxide and synthesis method, which is applied in the direction of physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc. Slow activity, poor thermal stability and other problems, to achieve the effect of superior oxidation catalytic performance, low cost, and low equipment requirements

Inactive Publication Date: 2007-05-02
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

However, there are still three major disadvantages in the nano-iron oxide catalyst obtained above: one is that the activation of the catalyst is a slow process, and the activation temperature range is greater than 100°C; the second is that the activation temperature is still too high, above 300°C; the third is that The thermal stability is still poor. For example, for the nano-iron oxide catalyst with a hollow tubular structure, the activation temperatures of the second and third CO oxidation catalytic tests were respectively 12°C and 28°C higher than those of the first catalytic test.
The existence of these problems severely limits the industrial application of nano-iron oxide catalysts

Method used

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  • Nano iron oxide catalyst and its synthetic method
  • Nano iron oxide catalyst and its synthetic method
  • Nano iron oxide catalyst and its synthetic method

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example 1

[0011] Example 1: 0.404g (1mmol) analytically pure ferric nitrate and 0.600g molecular weight are 30000 polyvinylpyrrolidone surfactant (PVP, Mw=30000) to add in the 70ml polytetrafluoroethylene hydrothermal tank , then accurately measure 36ml of N,N-dimethylformamide (DMF) with a pipette and stir thoroughly to obtain a transparent dark red solution. Then seal the hydrothermal tank with a steel shell, turn it into a resistance furnace and heat it up to 160°C at a heating rate of 5°C / min and keep it warm for 10 hours, then continue to heat it up to 180°C at a heating rate of 5°C / min and keep it warm for 20 hours. After the reaction, the hydrothermal tank was naturally cooled to room temperature. Finally, the red precipitate was washed with water and ethanol, centrifuged, and dried naturally in air to obtain a reddish-brown iron oxide powder catalyst.

example 2

[0012] Example 2: 0.270g (1mmol) ferric chloride and 0.600g molecular weight are the polyvinylpyrrolidone surfactant (PVP, Mw=30000) of 30000 to add in the 70ml polytetrafluoroethylene hydrothermal tank, then accurately measure with pipette Take 36ml of N,N-dimethylformamide (DMF) and stir well to obtain a transparent dark red solution. Then seal the hydrothermal tank with a steel shell, turn it into a resistance furnace and heat it up to 160°C at a heating rate of 5°C / min and keep it warm for 10 hours, then continue to heat it up to 180°C at a heating rate of 5°C / min and keep it warm for 20 hours. After the reaction, the hydrothermal tank was naturally cooled to room temperature. Finally, the red precipitate was washed with water and ethanol, centrifuged, and dried naturally in air to obtain a reddish-brown iron oxide powder catalyst.

example 3

[0013] Example 3: 0.199g (1mmol) ferrous chloride and 1.160g molecular weight are the polyvinylpyrrolidone surfactant (PVP, Mw=58000) of 58000 and add in the 70ml polytetrafluoroethylene hydrothermal jar, then accurately with pipette Measure 36ml of N,N-dimethylformamide (DMF) and stir thoroughly to obtain a transparent dark red solution. Then seal the water-heating tank with a steel shell, turn it into a resistance furnace and raise the temperature to 180°C at 5°C / min and keep it warm for 30h. After the reaction, the hydrothermal tank was naturally cooled to room temperature. Finally, the red precipitate was washed with water and ethanol, centrifuged, and dried naturally in the air to obtain a reddish-brown iron oxide powder catalyst.

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Abstract

A nano-iron oxide catalyst for the catalytic oxidizing of CO with high catalytic activity and thermal stability is prepared through dissolving Fe salt and pyrrolidone in N,N-dimethyl formamide, stirring, reaction, cooling, washing and drying.

Description

technical field [0001] The invention relates to the field of catalytic oxidation of CO, in particular to a synthesis method of a nanometer iron oxide catalyst. Background technique [0002] Iron oxide is a traditional catalyst and the carrier of supported catalysts. Since the advent of nano-iron oxide CO oxidation catalysts, improving their catalytic activity and thermal stability has always been a problem of concern. The Dutch "Applied Catalysis B: Environmental" (Applied Catalysis B: Environmental, 2003, Vol. 43, P. 151) mentions that nanoscale iron oxide particle catalysts with small size and large specific surface area are more efficient than traditional micron-sized catalysts in CO oxidation. Catalytic activity and thermostability aspect all have obvious improvement; U.S. " Inorganic Chemistry " (Inorg.Chem., 2004, the 43rd volume, the 6540th page) report synthesizes the hollow tubular structure nano-iron oxide catalyst by thermal decomposition method Compared with th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J37/03
Inventor 郑远辉程遥王元生
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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