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In situ synthesis of PT/MNO for catalytic combustion of VOCs 2 @mn 3 o 4 Catalyst, preparation method and application thereof

An in-situ synthesis and catalytic combustion technology, which is applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, combustion method, etc., can solve the problem of further improvement of catalytic activity and stability, increase of application cost, Problems such as complex process, to achieve good industrial application potential, low loading, simple preparation method

Active Publication Date: 2019-12-13
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there have been many studies on the use of transition metal oxides to support Pt, the preparation of catalysts usually requires multiple steps and the process is relatively complicated. Still high, resulting in higher application costs, and the catalytic activity and stability need to be further improved

Method used

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  • In situ synthesis of PT/MNO for catalytic combustion of VOCs <sub>2</sub> @mn <sub>3</sub> o <sub>4</sub> Catalyst, preparation method and application thereof
  • In situ synthesis of PT/MNO for catalytic combustion of VOCs <sub>2</sub> @mn <sub>3</sub> o <sub>4</sub> Catalyst, preparation method and application thereof
  • In situ synthesis of PT/MNO for catalytic combustion of VOCs <sub>2</sub> @mn <sub>3</sub> o <sub>4</sub> Catalyst, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In situ synthesis of Pt / MnO 2 @Mn 3 o 4 Catalyst preparation:

[0022](1) Dissolve 0.02 mol of potassium permanganate in 35 mL of deionized water, and place it in a 60°C water bath with vigorous stirring; dissolve 0.036 mol of oxalic acid in 35 mL of deionized water to obtain an oxalic acid solution; It was added dropwise to the potassium permanganate solution, mixed and stirred at 60 °C for 30 min; then the mixed solution was transferred to the reaction kettle and reacted at 180 °C for 12 h. The reacted precipitate was centrifuged and washed with deionized water and absolute ethanol, dried in an oven at 80 °C for 12 h, and then calcined in a muffle furnace at 400 °C for 5 h to obtain MnO 2 ;

[0023] (2) Take 0.6g of prepared MnO 2 Disperse in 8mL deionized water, add 0.8mL H with a concentration of 0.0193mol / L 2 PtCl 6 The solution was stirred at room temperature for 60min; 0.005mol / L NaBH was prepared 4 solution, take 0.95mL of this solution and add it to the...

Embodiment 2

[0033] The catalysts A, B, C, and D prepared in Example 1 and Comparative Examples 1-3 were tested by X-ray diffraction to obtain the corresponding XRD patterns. The results are as follows figure 1 shown. Pt diffraction peaks did not appear in all catalysts. The catalysts of Example 1 and Comparative Example 3 are shown as MnO 2 and Mn 3 O 4 The mixed phase of Comparative Examples 1 and 2 only has MnO 2 and Mn 3 O 4 the corresponding diffraction peaks.

Embodiment 3

[0035] The catalyst obtained in Example 1 and Comparative Examples 1-3 was subjected to a toluene catalytic combustion activity test, and the device used was a self-made fixed-bed continuous microreactor, and the gas chromatography GC 7900 equipped with a FID detector was used to quantitatively analyze the toluene before and after the oxidation reaction. concentration. The specific conditions of the test include: the initial concentration of toluene is 500ppm, argon is used as the balance gas, and the space velocity of the reaction gas is 24000h -1 ; The chromatographic column is a special column for benzene series, the column temperature is 80℃ during detection, and the detector temperature is 200℃. The reactivity of each catalyst is as figure 2 As shown, the activity of catalyst A was the best, and the removal rate of toluene reached 97% at 150 °C.

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Abstract

The invention belongs to the technical field of environment catalytic purification and provides an in-situ synthesized Pt / MnO2@Mn3O4 catalyst for catalytic combustion of VOCs (Volatile Organic Compounds) as well as a preparation method and application of the in-situ synthesized Pt / MnO2@Mn3O4 catalyst. The preparation method comprises the following steps: taking potassium permanganate and oxalic acid as raw materials and preparing MnO2 by utilizing a hydrothermal method; then taking MnO2 as an initial carrier and utilizing sodium borohydride as a reducing agent; carrying out liquid-phase reduction on H2PtC16 under a room-temperature condition, and carrying out structure regulation and control on the MnO2 carrier; carrying out one-step reduction to obtain an in-situ synthesized mixed-phase MnO2@Mn3O4 catalyst carrier loading type Pt-based catalyst, wherein the content of Pt is 0.2 to 0.5 weight percent. The preparation method provided by the invention has a simple preparation process; the dispersed loading of active components and the optimization of a carrier structure can be realized in one step. The catalyst provided by the invention is applied to the catalytic combustion of the VOCs including toluene, xylol and the like and has relatively good low-temperature activity and stability; no other waste gas is generated.

Description

technical field [0001] The invention belongs to the technical field of environmental catalytic purification, and specifically provides an in-situ synthesized Pt / MnO used in the catalytic combustion of VOCs 2 @Mn 3 o 4 Catalyst and method for its preparation. Background technique [0002] With the development of modern industry and economy, environmental problems are becoming more and more serious, among which air pollution is very prominent. Volatile organic compounds are one of the main pollutants in the air, and their main sources include industrial waste gas emitted by the chemical industry, automobile exhaust and materials used in interior decoration. The release of volatile organic compounds will form PM2.5 and photochemical smog, destroy ecological health, and damage the human respiratory system and immune system. Among them, benzene series (such as toluene, xylene, etc.) are even teratogenic and mutagenic, so they are harmful to the air. The removal of VOCs in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/656B01J37/10B01J37/16F23G7/07
CPCB01J23/6562B01J37/10B01J37/16F23G7/07F23G2209/14Y02A50/20
Inventor 曲振平段潇潇
Owner DALIAN UNIV OF TECH
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