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a mox/g-c 3 no 4 @sio 2 Catalyst preparation method and its application

A technology of g-c3n4 and catalyst, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, combustion methods, etc., can solve problems such as easy poisoning, high cost of noble metal catalysts, and influence on popularization and application, and achieve good thermal stability , The effect of easy adjustment of type and load, and simple preparation process

Active Publication Date: 2020-06-23
XILINGOL VOCATIONAL COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, noble metal catalysts have the disadvantages of high cost and easy poisoning, which hinder their popularization and application.

Method used

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  • a mox/g-c <sub>3</sub> no <sub>4</sub> @sio <sub>2</sub> Catalyst preparation method and its application
  • a mox/g-c <sub>3</sub> no <sub>4</sub> @sio <sub>2</sub> Catalyst preparation method and its application
  • a mox/g-c <sub>3</sub> no <sub>4</sub> @sio <sub>2</sub> Catalyst preparation method and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] g-C 3 N 4 @SiO 2 Preparation of: 3g dicyandiamide and 1g SiO 2 Mix and grind nano-microspheres, heat up to 550°C at 2.3°C / min in a muffle furnace, and keep the temperature for 4 hours to obtain g-C 3 N 4 @SiO 2 . figure 1 is the XRD pattern of the obtained carrier. The present embodiment takes dicyandiamide as an example, but g-C 3 N 4 The precursor of is not limited to dicyandiamide, melamine, urea are also within the protection scope of the present invention, and melamine, urea are used as g-C 3 N 4 The precursor of the above-mentioned dicyandiamide g-C can also be used 3 N 4 @SiO 2 preparation steps.

[0029] Raw materials used in Table 1 Embodiment 1

[0030] raw material purity source Dicyandiamide CP Beijing Guanghua Fine Chemicals Co., Ltd. SiO 2 nanosphere

Embodiment 2

[0032] MOx / g-C 3 N 4 @SiO 2 Preparation: 1 g of g-C 3 N 4 @SiO 2 Immerse in 0.01mol / L nitrate solution (Fe, Co, Cu, Mn, etc.), then filter, dry, grind, heat up to 400°C in a muffle furnace at 5°C / min, and roast at a constant temperature for 2h to obtain MOx / g-C 3 N 4 @SiO 2 .

[0033] Raw materials used in table 2 embodiment 2

[0034] raw material purity source Ferric nitrate AR Tianjin Guangfu Fine Chemical Research Institute copper nitrate AR Tianjin Tianli Chemical Reagent Co., Ltd. manganese nitrate AR Tianjin Damao Chemical Reagent Factory cobalt nitrate Ar Tianjin No.3 Chemical Reagent Factory Deionized water N / A self made

Embodiment 3

[0036] Catalyst activity evaluation: take by weighing 0.2g of the catalyst prepared in Example 2, mix it with 2.0g of quartz sand, place it in a quartz reaction tube with an inner diameter of 8mm in a fixed-bed reactor, adjust the air flow rate, and control the toluene concentration to 1000ppm. 10000h -1 , the reaction temperature range is from 50°C to 500°C, and the catalyst bed is subjected to temperature programming to test the light-off curve of the catalyst, and the concentration of toluene and products and the conversion rate of toluene are measured by gas chromatography and hydrogen flame ion detector (FID). activity evaluation. figure 2 It is MnOx / , CuOx / , CoOx / and FeOx / etc. toluene catalytic combustion ignition curve.

[0037] In each catalyst prepared in Example 2 of the present invention, the initial combustion temperature (the temperature T at which the conversion rate is 10%) is related to the catalytic combustion of toluene 10 ) and the end combustion temper...

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Abstract

The invention belongs to the technical field of non-noble metal catalyst and gas pollutant elimination, and relates to preparation of a graphite-phase carbon nitride (g-C3N4) loaded non-noble metal oxide catalyst and an application of the catalyst in a toluene catalytic combustion reaction. A g-C3N4 precursor and SiO2 nano-microspheres are mixed and are roasted in a muffle furnace to prepare g-C3N4@SiO2; with the prepared g-C3N4@SiO2 as a carrier, a certain amount of nitrate is added, impregnation is carried out for a certain time, drying and grinding are carried out, the obtained solid powder is roasted in the muffle furnace, and the MOx / g-C3N4@SiO2 catalyst is obtained. The combustion catalytic catalyst has the advantages of high activity, good stability, simple preparation of the carrier, wide source of active components and low cost. The loading process adopts the impregnation method which is easy to industrialize, and the method has simple operation and easy scale production.

Description

technical field [0001] The invention belongs to the technical field of non-precious metal catalysts and gas pollutant elimination, and relates to a graphite phase carbon nitride (g-C 3 N 4 ) Preparation of supported non-noble metal oxide catalyst and its application in the catalytic combustion reaction of toluene. Background technique [0002] Volatile Organic Compounds (Volatile Organic Compounds, VOCs) are an important source of air pollution (Science, 2013, 341:643; Front.Environ.Sci.Eng., 2016,10:1). The World Health Organization (WHO) defines VOCs as: a general term for volatile organic compounds with a melting point below room temperature and a boiling point between 50 and 260 °C, including hydrocarbons, alcohols, aldehydes, etc., and the identified compounds have been There are more than 300 species (J.Catal., 2011, 281:88). VOCs are not only toxic, but their emissions can cause the greenhouse effect, destroy the ozone layer, and produce photochemical smog, which i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24F23G7/07
CPCB01J27/24F23G7/07F23G2209/14
Inventor 刘树森任军李亮亮张亮罗东谋
Owner XILINGOL VOCATIONAL COLLEGE