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Pressurized electrochemical process for syngas production [Resumo]
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Advisor(s)
Abstract(s)
ABSTRACT: Carbon Capture and Utilisation (CCU) comprise technologies that capture carbon dioxide and convert it into chemical products, such as fuels, chemicals and building materials that can replace the same products derived from fossil resources. These technologies can thus contribute to reach the ambitious 2030 targets set by the European Union for decarbonisation of the economy of 40% CO2 reduction, introduction of 27% renewable energies in the energy mix and 27% energy efficiency. CCU technologies are at different stages of maturity and some are already commercially deployed. One of these commercial technologies is the production of methanol by CO2 hydrogenation at high temperature using hydrogen produced by water electrolysis. Another CCU technology that is still at laboratory stage is electrochemical CO2 reduction. In this process carbon dioxide is co-electrolyzed with water near room temperature. Hydrogen is produced in situ. Depending on process conditions and catalysts CO2 reduction originates a series of products, such as CO, formic acid, hydrocarbons, alcohols etc. at the cathode. Oxygen is produced at the anode resulting from water oxidation reaction. Figure 1 illustrates the process. Electrochemical CO2 reduction presents several technological challenges that have not been surpassed yet, such as low CO2 conversions, poor stability of electrodes and low energy efficiencies. This work reports not yet published results of the development of a pressurized electrochemical process for producing syngas (CO + H2) by electrochemical reduction of carbon dioxide. Green syngas produced using renewable energy can be an important platform for introducing renewable energy in the chemical industry. The development of a process that works at pressures higher then atmospheric pressure seems promising to circumvent the aforementioned challenges, namely low conversions and low energy efficiencies.
Description
Keywords
Carbon dioxide Electrochemical reduction Energy conversion Electrolytes Green chemistry
Citation
Messias, Sofia... [et.al.] - Pressurized electrochemical process for syngas production. In: 17th European Meeting on Supercritical Fluids (EMSF 2019), Book of Abstract, Ciudad Real, Spain, 8-11 april, 2019