A high-temperature electrolysis co2/h2o hydrocarbon production system and its application

Abstract

The invention relates to a system for preparing hydrocarbon by virtue of high-temperature electrolysis of CO2 / H2O and application thereof. The system comprises an electrolysis unit and an electrical heating unit used for heating the electrolysis unit, wherein the electrolysis unit comprises a direct current power supply, a cathode, an anode, an electrolytic tank and an electrolyte, wherein the electrolyte is a mixture of molten carbonates and molten hydroxides, or a mixture of molten carbonates and molten oxides, or a mixture of molten carbonates, molten hydroxides and molten oxides. In electrolysis, the current of the direct current power supply is in (0A-3A) range, the temperature of the electrolytic tank is not less than 450 DEG C, and the electrolyte is regenerated by absorbing CO2 / H2O in air. By the system, the preparation of hydrocarbon by virtue of co-electrolysis of CO2 / H2O under the conditions of low electrolysis voltage and relatively low temperature is achieved, the electrolysis reaction is relatively simple, the reaction selectivity is good, and the CO2 resource utilization 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 hydrocarbon production system and its application 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 activati...

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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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