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A kind of dimolybdenum carbide/titanium dioxide composite photocatalyst and its preparation method and application

A catalyst and composite light technology, which can be used in carbon compound catalysts, catalyst activation/preparation, hydrocarbon production from carbon oxides, etc., can solve the problems of low catalytic activity and high cost

Active Publication Date: 2021-04-20
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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  • A kind of dimolybdenum carbide/titanium dioxide composite photocatalyst and its preparation method and application
  • A kind of dimolybdenum carbide/titanium dioxide composite photocatalyst and its preparation method and application

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Experimental program
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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 molybdenum carbide / titanium dioxide composite photocatalyst, a preparation method and application thereof, and belongs to the technical field of material preparation and environmental treatment. Preparation of Mo by molybdenum source and aniline 2 C powder, then Mo 2 C powder and di(2-hydroxypropionic acid) diammonium titanium hydroxide were dissolved in deionized water to prepare a precursor solution, and finally carried out hydrothermal reaction to obtain Mo 2 C / TiO 2 composite photocatalyst. The non-toxic, harmless, stable and highly photocatalytic TiO 2 and Mo with good electrocatalytic hydrogen evolution performance 2 C is compounded, and the prepared composite material has a large specific surface area, which can increase the CO 2 The contact area and adsorption capacity, and its surface active centers, can provide a larger and more effective active reaction area, with excellent photocatalytic reduction of CO 2 The performance, simple preparation process, low cost, readily available raw materials and abundant reserves, only need solar energy to carry out photocatalytic reaction without consuming other energy sources, the reduction products are methane and carbon monoxide, which can be used as fuel, energy saving and environmental protection.

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 Patents(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