Preparation method of MnOx-CeO2 composite semiconductor catalyst

A compound semiconductor and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of narrow spectral response of semiconductor materials, limited efficiency of VOCs, high price of precious metals, etc., and achieve improved catalytic purification Efficiency, cheap raw materials, and easy operation

Inactive Publication Date: 2015-02-11
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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Problems solved by technology

However, limited by the adsorption capacity, the adsorption technology requires the market to regenerate the adsorbent, and is limited by adsorption rather than degradation, and its secondary pollution cannot be avoided.
Although noble metal-supported catalysts have high activity and no secondary pollution and other problems, it is undeniable that due to the high price of noble metals, they are at a disadvantage in cost competition, which greatly limits their daily applications. Greatly increasing its action temperature is not conducive to its application
In addition, TiO, which is currently the most widely studied in photocatalytic technology 2 Although the type catalyst is green, clean and low in cost, it also faces many limitations and problems due to its narrow spectral response of semiconductor materials and limited catalytic degradation efficiency of VOCs.

Method used

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  • Preparation method of MnOx-CeO2 composite semiconductor catalyst
  • Preparation method of MnOx-CeO2 composite semiconductor catalyst
  • Preparation method of MnOx-CeO2 composite semiconductor catalyst

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preparation example Construction

[0033] The present invention relates to a kind of MnO x -CeO 2 Preparation method of composite semiconductor catalyst. The composite semiconductor catalyst can efficiently catalyze and degrade volatile organic pollutants (VOCs) such as formaldehyde, benzene, and acetone under the condition of low-temperature light and heat synergy; In situ regeneration under the action of irradiation.

[0034] The invention relates to a kind of MnO with low-temperature photothermal synergistic catalytic degradation of VOCs and light-assisted self-repair function x -CeO 2 The preparation method of composite semiconductor catalyst comprises the following steps:

[0035] 1) Weigh Ce(Ⅲ,Ⅳ) salt and KMnO 4 , dissolved in deionized water to obtain a uniform mixed solution, and the prepared alkali solution was added to the above mixed solution to obtain a uniform suspension, that is, according to CeO 2 with MnO x The ratio of different substances of the semiconductor is (100-30): (0-70) weigh C...

Embodiment 1

[0049] MnO with low-temperature photothermal synergistic catalytic degradation of VOCs and photo-assisted self-healing function x -CeO 2 The preparation method of composite semiconductor catalyst (Ce / Mn molar ratio 3:1) is as follows:

[0050] (1) Weigh 3mmolCe(NO 3 ) 3 ·6H 2 O and 1 mmol KMnO 4 , added to 40ml of NaOH aqueous solution with a molar concentration of 6M, and magnetically stirred at room temperature to obtain a precipitated nano-seed suspension;

[0051] (2) Move the mixed solution to a 50ml stainless steel reaction kettle with a polytetrafluoroethylene liner, seal it, and conduct a hydrothermal reaction at a temperature of 110°C for 24 hours;

[0052] (3) After the reaction is completed, the reactor is cooled to room temperature, the polytetrafluoroethylene liner is taken out, filtered, washed, and dried at 60°C for 12 hours to obtain MnO x -CeO 2 Composite catalyst (Ce / Mn molar ratio 3:1).

Embodiment 2

[0054] The MnO that embodiment 1 obtains x -CeO 2 The composite catalyst is used for photothermal synergistic catalytic degradation of 250ppm formaldehyde, and the catalytic reaction temperature is 50°C. The specific implementation steps are as follows:

[0055] (1) take by weighing the MnO that embodiment 1 gains x -CeO 2 0.1g of the composite catalyst was ground and placed at the bottom of the experimental reactor and spread evenly;

[0056] (2) The specific experimental device is described as follows: the experimental reactor is a 650ml cylindrical glass reactor with a jacket that can pass through circulating water, and the top is made of high light-transmitting quartz glass; the upper part is 10cm away from a 500W Xe lamp as a simulated solar light source; The sleeve is connected to the water bath constant temperature tank, which can accurately control the temperature of the catalyst at the bottom of the reactor during the experiment; the reactor is connected to the 789...

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Abstract

The invention relates to a preparation method of a MnOx-CeO2 composite semiconductor catalyst which has the function of low-temperature photo-thermal concerted catalytic purification of VOCs and the light-assisted self repairing function. The chemical formula of the MnOx-CeO2 composite semiconductor catalyst is Ce<1-a>MnaO<2-Delta>, wherein a is larger than 0 and smaller than 0.7; the method comprises the following steps: (1) weighing Ce salt and KMnO4, and dissolving in an alkaline solution to obtain a mixed suspension solution; (2) sealing the mixed suspension solution to have a hydrothermal reaction to obtain a precipitate; (3) separating the prepared precipitate, washing, drying and then grinding to obtain the MnOx-CeO2 composite semiconductor catalyst.

Description

technical field [0001] The present invention relates to a kind of MnO x -CeO 2 The invention discloses a method for preparing a composite semiconductor catalyst, which belongs to the field of low-temperature photothermal synergistic catalytic degradation of VOCs and light-assisted self-repair. Background technique [0002] With the progress of society and the deepening of urbanization and industrialization, volatile organic pollutants (VOCs) such as formaldehyde, benzene, toluene, acetone, etc., not only have great harm to human health, but will also cause serious environmental pollution. pollute. In particular, harmful pollutants such as formaldehyde widely exist in people's lives, threatening people's health and the environment at all times. [0003] At present, VOCs treatment technologies that have been widely studied include adsorption, bioabsorption, catalytic oxidation, and photocatalytic degradation. It also appears to be the most effective and widely used. Howev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/86B01D53/72
Inventor 王文中蒋东郑雅丽
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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