comunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/7053
comunitat-uji-handle3:10234/8639
comunitat-uji-handle4:
INVESTIGACION
Resumen
Hydrochloric acid (HCl) and caustic (NaOH) are among the most widely used chemicals by the water
industry. Direct anodic electrochemical HCl production by water electrolysis has not been successful
as current ... [+]
Hydrochloric acid (HCl) and caustic (NaOH) are among the most widely used chemicals by the water
industry. Direct anodic electrochemical HCl production by water electrolysis has not been successful
as current commercially available electrodes are prone to chlorine formation. This study presents an
innovative technology simultaneously generating HCl and NaOH from NaCl using a Mn0.84Mo0.16O2.23
oxygen evolution electrode during water electrolysis. The results showed that protons could be
anodically generated at a high Coulombic efficiency (i.e.≥95%) with chlorine formation accounting for
3~5% of the charge supplied. HCl was anodically produced at moderate strengths at a CE of 65±4%
together with a CE of 89±1% for cathodic caustic production. The reduction in CE for HCl generation
was caused by proton cross-over from the anode to the middle compartment. Overall, this study
showed the potential of simultaneous HCl and NaOH generation from NaCl and represents a major step
forward for the water industry towards on-site production of HCl and NaOH. In this study, artificial brine
was used as a source of sodium and chloride ions. In theory, artificial brine could be replaced by saline
waste streams such as Reverse Osmosis Concentrate (ROC), turning ROC into a valuable resource. [-]
Derechos de acceso
info:eu-repo/semantics/openAccess