Analysis of carbon dioxide-to-methanol direct electrochemical conversion mediated by an ionic liquid

Carlos Carlesi, Danilo Carvajal, Dreidy Vasquez, Rodrigo Schrebler Arratia

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

An intensified process for carbon dioxide capture and conversion is proposed and analyzed, considering an electrochemical parallel plate reactor which processes a CO2-charged stream from an absorption unit at 40°C and atmospheric pressure and where the target product of the conversion is methanol. The task-specific ionic liquid 1-(3-aminopropyl)-3-methylimidazolium bromide was selected, synthesized and characterized. This ionic liquid has shown a good absorption capacity, high ionic conductivity, high chemical-electrochemical stability and acts as a charged intermediate (CO2*-) stabilizer, enabling the electrochemical reduction of absorbed CO2.The electrical energy in the electrochemical reactor was estimated to be 8.683kWhkg (CO2)-1 or 115.16g (CO2) kWh-1, too high to ensure the environmental sustainability of the process. A low concentration of carbon dioxide in the liquid phase, at ambient conditions, implies the need for a high electrode area for the process and is a major hindrance to improving the economy of the process.

Original languageEnglish
Pages (from-to)48-56
Number of pages9
JournalChemical Engineering and Processing: Process Intensification
Volume85
DOIs
StatePublished - Nov 2014
Externally publishedYes

Keywords

  • 1-(3-Aminopropyl)-3-methylimidazolium bromide
  • Absorption
  • Carbon dioxide
  • Electrochemical conversion
  • Ionic liquid
  • Reduction reaction

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