Reaction system and method for photocatalytic reduction of carbon dioxide

Abstract

The invention discloses a reaction system and method for photocatalytic reduction of carbon dioxide. An inlet of an inlet gas cooling device is communicated with a waste gas channel, and an outlet of the inlet gas cooling device is communicated with a gas collecting and supplying tank; a carbon dioxide membrane separation device is arranged in the gas collecting and supplying tank, a gas inlet and a tail gas outlet of the device are communicated with an inner cavity of the gas collecting and supplying tank, and a gas collection outlet is communicated with an input port of the photocatalytic reduction device through a pipeline; an output port of the photocatalytic reduction device is communicated with a gas inlet of the carbon monoxide membrane separation device through a pipeline, a gas collection outlet of the carbon monoxide membrane separation device is communicated with a first gas collection bottle, and a tail gas outlet is communicated with a gas inlet of the methane membrane separation device; and a gas collection outlet of the methane membrane separation device is communicated with a second gas collection bottle, and a tail gas outlet is communicated with the gas collecting and supplying tank. The integrated process is achieved, a feasible scheme is provided for CO2 treatment, waste gas resources can be effectively utilized, and the resource utilization rate is increased.

Description

technical field [0001] The invention relates to the technical field of waste gas treatment, in particular to a photocatalytic carbon dioxide reduction reaction system and method. Background technique [0002] In recent years, the greenhouse effect caused by large-scale industrial exhaust emissions has become a global focus, and the use of photocatalytic reduction methods to reduce CO 2 Converting to hydrocarbons is a potential way to reduce emissions while utilizing CO 2 effective way. It uses semiconductor materials as catalysts. When light with energy higher than the forbidden band width of the semiconductor is irradiated on the surface of the catalyst, the electrons in the semiconductor will be excited to transition from the valence band to the conduction band, forming highly active electron-hole pairs, making CO 2 The reduction reaction can be carried out. This method has low energy consumption, low cost, and no pollution. It is effective in reducing CO 2 emissions w...

AI Technical Summary

Problems solved by technology

There are also some that use the application of an electric field as a catalytic reduction, but the device structure is more complicated

Therefore, the current reduction reaction still has disadvantages such as complex catalyst preparation and the need to apply an additional electric field, and it is only a single step of photocatalytic reduction, lacking CO 2 A series of technological processes from collection to storage cannot make good use of resources

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