Method for reducing carbon dioxide through photocatalysis

Abstract

The invention discloses a method for reducing carbon dioxide through photocatalysis. The method is characterized in that carbon dioxide is taken as a raw material, a TiO2 / Ti3C2 photocatalytic membrane is taken as a catalyst, and the carbon dioxide is subjected to photocatalytic reduction to obtain carbon monoxide, methane, ethane and ethylene. The TiO2 / Ti3C2 photocatalytic membrane has rich active sites and a narrow in-membrane channel, carbon dioxide can penetrate through the narrow in-membrane channel when photocatalytic carbon dioxide reduction reaction is carried out, the contact probability of the carbon dioxide and a catalyst is increased, the photocatalytic carbon dioxide reduction efficiency can be improved, and a C-C coupling reaction can be promoted to obtain a C2 + product. The TiO2 / Ti3C2 photocatalytic membrane is used for photocatalytic carbon dioxide reduction reaction, so that carbon monoxide and methane can be obtained, and C2 + products such as ethane and ethylene products can also be obtained. The method of the invention has the advantages that the preparation process of the TiO2 / Ti3C2 photocatalytic membrane is simple, the membrane can be formed independently, the type and size of channels in the membrane are adjustable, and C-C coupling reaction can be promoted to obtain C2 + products such as ethylene and ethane.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of carbon dioxide, and in particular relates to a photocatalytic carbon dioxide reduction method using a photocatalytic film as a catalyst. Background technique [0002] With the burning of fossil fuels, the problems of energy crisis and environmental pollution are becoming more and more prominent. As the main component of greenhouse gases, the reduction and utilization of carbon dioxide is the key to solving the problem. Photocatalytic carbon dioxide reduction is a technology that utilizes solar energy to convert carbon dioxide into other valuable chemicals, and has received great attention due to its advantages such as mild reaction conditions, environmental protection and pollution-free, and low energy consumption. At the same time, reducing carbon dioxide to ethane and ethylene with higher value is a difficult problem to be overcome by photocatalytic carbon dioxide reduction technolog...

AI Technical Summary

Problems solved by technology

In the process of photocatalytic carbon dioxide reduction, traditional powder photocatalysts have problems such as complicated operation, difficult catalyst recovery, poor mass transfer and contact of carbon dioxide, etc.