A high temperature electrolysis co2/h2o preparation system for synthesis gas and its application

Abstract

The invention relates to a system for preparing synthetic gas by virtue of high-temperature electrolysis of CO2 / H2O and an application of the system. The system comprises an electrolytic unit and an electric heating unit, wherein the electric heating unit is used for heating the electrolytic unit, the electrolytic unit comprises a direct current power source, a cathode, an anode, an electrolytic cell and an electrolyte, the electrolyte is a mixture of molten carbonate and molten hydroxide, or a mixture of molten carbonate and molten oxide or a mixture of molten carbonate, molten hydroxide and molten oxide; and in electrolysis, the current of the direct current power source is within (0A-3A) range, the temperature of the electrolytic cell is above 600 DEG C and the electrolyte is regenerated by virtue of absorbing CO2 / H2O in air. By virtue of the system, under low electrolysis voltage and a relatively low temperature, the preparation of synthetic gas by virtue of co-electrolysis of CO2 / H2O is achieved. The electrolysis reaction is relatively simple, the reaction selectivity is good and the resource utilization of CO2 can be simply and efficiently achieved in energy-saving and low cost manners.

Description

technical field [0001] The invention relates to a high-temperature electrolytic CO 2 / H 2 O conversion to synthesis gas system and its application, which belong to energy saving and emission reduction and CO 2 resource field. Background technique [0002] CO 2 It is one of the most important greenhouse gases that cause global climate change. CO 2 The large amount of CO emissions has become an international issue that will have a major impact on future changes in the world pattern. How to control CO 2 The emission of carbon dioxide has been listed as the primary topic of governments and United Nations conferences, and has become a strategic issue to be solved urgently among many major global issues. In addition, carbon dioxide is a potential carbon resource, so it is of great strategic significance to develop corresponding carbon dioxide recovery and utilization technologies. At present, the recovery and transformation of carbon dioxide mainly focus on catalytic activat...

AI Technical Summary

Problems solved by technology

Current CO 2 Electrochemical reduction studies mainly focus on CO 2 Dissolved in aqueous solvents and non-aqueous organic solvents, but this also limits its industrial application. In addition, CO 2 For gas molecules, direct electrolytic reduction is very difficult. First, high energy consumption (high electrolysis voltage) is required. Second, the electrolytic reaction is very complicated, and the efficiency and selectivity are poor.

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