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Dimolybdenum carbide/titanium dioxide composite photocatalyst, and preparation method and application thereof

A technology of catalyst and composite light, which is applied in the direction of carbon compound catalysts, catalyst activation/preparation, and hydrocarbon production from carbon oxides. It can solve the problems of high cost and low catalytic activity, and achieve increased contact area, easy raw materials, and The effect of excellent photocatalytic CO2 reduction performance

Active Publication Date: 2019-01-11
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, in TiO 2 The catalytic activity of semiconductors doped with noble metals is better. The existing technology mainly uses Pt, but the cost is too high
And Mo 2 C is a Pt-like compound, which has good electrocatalytic hydrogen evolution performance, and theoretical calculations also show that it has a strong dissociation ability for water molecules, but Mo 2 C itself is not very catalytic

Method used

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  • Dimolybdenum carbide/titanium dioxide composite photocatalyst, and preparation method and application thereof
  • Dimolybdenum carbide/titanium dioxide composite photocatalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Step 1: Weigh 2.48g of ammonium heptamolybdate and dissolve it in a 250ml clean beaker filled with 40ml of deionized water, add 3.33ml of aniline, and then add 1mol / L hydrochloric acid dropwise (take 8.3ml concentrated hydrochloric acid and dilute to 100ml capacity bottle) while stirring until a small amount of white precipitate appeared. The solution containing a small amount of white precipitate was stirred in a water bath at 50°C for 5 hours (a large amount of white precipitate appeared), and after cooling down to room temperature, the large amount of white precipitate was washed 3 times with deionized water and 3 times with ethanol until neutral. Vacuum drying at a temperature of 50°C for 6 hours. After drying, use the high temperature carbonization method, and the flow rate is 50cm 3 / min95%Ar / 5%H 2 The mixed gas is kept at 20°C for 60 minutes to remove the air in the device, and then the temperature is raised to 725°C at a rate of 2°C / min and kept for 5 hours to...

Embodiment 2

[0038] Step 1: Weigh 2.48g of ammonium heptamolybdate and dissolve it in a 250ml clean beaker filled with 40ml of deionized water, add 3.33ml of aniline, and then add 1mol / L hydrochloric acid dropwise (take 8.3ml concentrated hydrochloric acid and dilute to 100ml capacity bottle) while stirring until a small amount of white precipitate appeared. The solution containing a small amount of white precipitate was stirred in a 50°C water bath for 2.5h (a large amount of white precipitate appeared), and after cooling down to room temperature, the large amount of white precipitate was washed 5 times with deionized water and 5 times with ethanol until neutral. Vacuum drying at 70°C for 4 hours. After drying, use the high temperature carbonization method, and the flow rate is 50cm 3 / min95%Ar / 5%H 2 The mixed gas is kept at 20°C for 60 minutes to remove the air in the device, and then the temperature is raised to 850°C at a rate of 2°C / min and kept for 5 hours to obtain Mo 2 C; treat ...

Embodiment 3

[0042] Step 1: Weigh 2.48g of ammonium heptamolybdate and dissolve it in a 250ml clean beaker filled with 40ML of deionized water, add 2.22ml of aniline, then add 1mol / L hydrochloric acid dropwise (take 8.3ml concentrated hydrochloric acid and dilute to 100ml capacity bottle) while stirring until a small amount of white precipitate appeared. The solution containing a small amount of white precipitate was stirred in a water bath at 50°C for 5 hours (a large amount of white precipitate appeared), and after cooling down to room temperature, the large amount of white precipitate was washed 3 times with deionized water and 3 times with ethanol until neutral. Vacuum drying, temperature 60 ° C, time 5h. After drying, use the high temperature carbonization method, and the flow rate is 50cm 3 / min95%Ar / 5%H 2 Mixed gas, kept at 20°C for 60min, then raised to 700°C at a rate of 2°C / min and kept for 5h, to obtain Mo 2 C; treat it in 95%Ar / 5%H 2 Cool to room temperature in a mixed gas,...

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Abstract

The invention discloses a dimolybdenum carbide / titanium dioxide composite photocatalyst, and a preparation method and an application thereof, and belongs to the technical fields of material preparation and environmental treatment. The preparation method comprises the following steps: preparing Mo2C powder from a molybdenum source and aniline, dissolving the Mo2C powder and titanium(IV) bis(ammonium lactato)dihydroxide in deionized water to prepare a precursor solution, and carrying out a hydrothermal reaction to obtain the Mo2C / TiO2 composite photocatalyst. The composite material prepared by compounding the high-photocatalytic activity nontoxic, harmless and stable TiO2 with Mo2C having a good electrocatalytic hydrogen evolution performance has a large specific surface area, and can increase the contact area and the adsorption amount of CO2; the composite photocatalyst has many surface active centers, so the composite photocatalyst can provide a large and effective active reaction area, and has an excellent photocatalytic CO2 reduction performance; the preparation method has the advantages of simple preparation process, low cost, and easy availability and abundant reserves of raw materials; and the photocatalytic reaction can be carried out only through using solar energy without other energies, and reduction products comprise methane and carbon monoxide and can be used as a fuel, so energy saving and environmental protection are achieved.

Description

technical field [0001] The invention belongs to the technical field of material preparation and environmental treatment, in particular to a dimolybdenum carbide (Mo 2 C) / titanium dioxide (TiO 2 ) composite photocatalyst and its preparation method and application. Background technique [0002] In recent years, with the intensification of human activities, leading to CO 2 The massive emissions of a series of greenhouse gases have made the problems of global warming, melting glaciers, and rising sea levels more and more serious. Therefore, for the healthy life of human beings, we must solve the excessive CO in the atmosphere 2 emission problem. Photocatalysis is very effective in the treatment of CO 2 The method uses solar energy to excite semiconductor photocatalytic materials, generate photogenerated electrons-holes, and induce oxidation-reduction reactions, which can convert CO 2 Convert water to hydrocarbon fuels or other chemicals. The process is carried out at norm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/22B01J37/10C01B32/40C07C9/04C07C1/02
CPCC01B32/40C07C1/02B01J27/22B01J37/10C07C2527/22B01J35/39C07C9/04Y02P20/133
Inventor 赵杰白雨洁冯帅军赖苗
Owner SHAANXI UNIV OF SCI & TECH
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