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High-temperature semiconductor catalyst and application thereof in carbon dioxide photoreduction

A semiconductor and catalyst technology, applied in the field of photocatalysis, to achieve the effect of expanding the light absorption range, broad application prospects, and improving absorption and conversion efficiency

Pending Publication Date: 2022-06-03
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] For photothermal catalysis of CO 2 The reduction reaction requires a semiconductor catalyst to withstand high temperatures. The invention provides a new type of semiconductor photocatalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The purchased GaN (Aladdin) and GaN / SiC (Aladdin, 40 μm) were fired in a muffle furnace at 700° C. in an air atmosphere for 2 hours to remove excess impurities.

[0027] Prepare 0.01mol / L Cu(NO 3 ) 2 solution and 0.1mol / L ascorbic acid solution. Dissolve 0.5 g of polyvinylpyrrolidone in 8 mL of deionized water, and then add 1 mL of 0.01 mol / L Cu(NO) 3 ) 2 solution and 1 mL of 0.1 mol / L ascorbic acid solution. Put it into a constant temperature water bath at 75°C, stir and react for 2h15min, and then immediately put it into an ice-water bath to obtain a Cu nanocluster solution.

[0028] Take GaN and GaN / SiC respectively, and disperse Cu nanoclusters on the surface of GaN according to the ratio of active component: carrier mass ratio of 0.5%: 99.5%. Put it under the concentrating system, and use the high light and heat environment generated by the concentrating light (5W / cm 2 , 300 °C) to quickly evaporate the water on its surface to dryness, so that the copper clus...

Embodiment 2

[0030] The catalyst performance was tested using a batch reaction system. with CO 2 and water as raw materials, in which CO 2 The initial pressure in the reactor was 0.1 MPa, the water was 2.5 mL, the pure semiconductor carrier GaN and SiC / GaN were used as catalysts, the dosage was 0.5 g, and the scale of the reactor was 100 mL. The reaction light intensity is 300W xenon lamp, and the temperature is room temperature. After 5 hours of reaction, no hydrocarbons were formed.

Embodiment 3

[0032] The catalyst performance was tested using a batch photothermal catalytic reaction system. with CO 2 and water as raw materials, in which CO 2 The initial pressure in the reactor was 0.1 MPa, the water was 2.5 mL, the Cu / GaN dosage was 0.5 g, and the reactor scale was 100 mL. The reaction light intensity is 300W xenon lamp, and the temperature is room temperature. After 5 hours of reaction, a small amount of hydrocarbons were formed, mainly methane, and the yield was about 25.2 μmol.g -1 .

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Abstract

The invention discloses a high-temperature semiconductor catalyst and application thereof in carbon dioxide photoreduction. The high-temperature semiconductor catalyst is composed of a semiconductor material and a transition metal oxide, the semiconductor material serves as a carrier and is selected from GaN or SiC / GaN, and the transition metal oxide is selected from at least one of copper oxide and silicon dioxide; the semiconductor photocatalyst is mainly characterized in that the limitation of the current room-temperature semiconductor catalyst is broken through, the reaction temperature is increased to 300 DEG C or above, the semiconductor photocatalyst adopts a high-temperature semiconductor material as a carrier and a transition metal oxide as an active component, the activation of a semiconductor is realized at high temperature, the light absorption range can be expanded, and the light absorption efficiency is improved. The solar energy absorption and conversion efficiency is effectively improved, more CO2 is reduced into high-value hydrocarbon such as methane, ethylene and ethane, the application prospect is wide, the solar energy conversion rate exceeds 2%, and industrial conditions are preliminarily met.

Description

technical field [0001] The invention relates to the field of photocatalysis, in particular to a method capable of efficiently realizing the catalytic conversion of CO by solar energy 2 It is a high temperature semiconductor catalyst for hydrocarbons. Background technique [0002] Global energy demand is rapidly increasing due to world population growth and massive industrial production. At present, traditional fossil fuels (oil, natural gas and coal) are still the main sources of energy consumption. However, the huge consumption of fossil fuels can cause serious environmental problems and massive carbon emissions. [0003] As an abundant, clean and renewable energy source, solar energy has been widely used in various fields in the past decades, including seawater desalination, solar evaporation, and photovoltaic processes. In 1972, Fujishima and Honda reported a pioneering work investigating the 2 A photoelectrochemical system consisting of a photoelectrode and a platinu...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J27/224B01J23/72C07C1/12C07C9/04C07C9/06C07C11/04
CPCB01J27/24B01J27/224B01J23/72C07C1/12C07C2527/24C07C2527/224C07C2523/72B01J35/23B01J35/39C07C9/04C07C9/06C07C11/04Y02P20/52
Inventor 张泽凯章鼎刘华彦卢晗锋朱秋莲
Owner ZHEJIANG UNIV OF TECH
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