Method for preparing methanol from carbon dioxide by photoelectric catalytic reduction

Abstract

The invention relates to a method for preparing methanol from carbon dioxide by photoelectric catalytic reduction. The methanol is prepared by a dye sensitization photoelectric catalytic unit which is composed of a titanium dioxide membrane electrode component and a positive electrode, wherein the titanium dioxide membrane electrode component comprises a glass substrate, a nano titanium dioxide membrane, a dye sensitization membrane, an electrolyte and a counter electrode; and the counter electrode of the component and the positive electrode are respectively connected with a constant voltage DC source. The method comprises the following steps: respectively putting a catalytic reduction area in the titanium dioxide membrane electrode component and the positive electrode into a container A containing distilled water and a container B; introducing carbon dioxide into the container A; connecting the container A and the container B with a U-shaped salt bridge; and reducing the carbon dioxide in the container A in the dye sensitization area under the irradiation of visible light to generate the methanol. The invention has the following advantages: the photocatalysis response range of titanium dioxide is widened to the visible light area, thereby enhancing the solar energy utilization efficiency; the sandwich structure prevents the dye from degradation, and enhances the service life of the unit; and the constant voltage DC source enhances the carbon dioxide reduction efficiency.

Description

【Technical Field】 [0001] The invention belongs to the resource utilization technology of greenhouse gases, and particularly relates to a method for preparing methanol by photoelectric catalytic reduction of carbon dioxide. 【Background technique】 [0002] Energy shortages and the greenhouse effect have begun to affect our living environment. At present, humans emit tens of billions of tons of carbon dioxide into the atmosphere every year. How to reduce the content of carbon dioxide in the atmosphere, alleviate the greenhouse effect, improve the human living environment, and achieve sustainable development, Has become the focus of world attention. Since carbon dioxide is the product of the highest oxidation stage of carbon, it has stable chemical properties and is easy to transport and store. If carbon dioxide can be converted into useful compounds, its industrial application prospects will be very impressive. Therefore, the development and utilization of carbon dioxide is a very ...

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Problems solved by technology

Due to the oxidation state of the dye (dye + ) has strong oxidizing properties, and can oxidize the reduction products of these carbon dioxide, even oxidize into carbon dioxide and water, so that the efficiency of converting carbon dioxide into compounds is reduced; Stable existence, will be gradually degraded and consumed, leading to the gradual cessation of carbon dioxide reduction reaction

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