A single catalyst of aqueous CoIII for deodorization of mixture odor gases: A development and reaction pathway study at electro-scrubbing process

Abstract

A constant generation of aqueous CoIII active catalyst and its utility on various odor gases deodorization at electro-scrubbing process is the primary investigation. The CoIII activation and regeneration for continuous use is established by electrochemical undivided cell in H2SO4 medium. The generated aqueous CoIII is then applied to simultaneous deodorization of simulated odor gases, namely, ammonia, trimethylamine, hydrogen sulfide, methyl mercaptan, and acetaldehyde, for municipal waste treatment plant emissions. The electro-scrubbing process results indicated that deodorization is almost complete at a low gas flow rate of 30Lmin−1. FTIR and pH studies demonstrated that amine compounds are removed via complex formation with H2SO4 and CoIII. In the case of sulfur compounds, deodorization of methyl mercaptan and hydrogen sulfide are removed by the CoIII-MEO (CoIII-mediated electrocatalytic oxidation) process via the formation of acetic acid as intermediate and SO42− as a product. Also, acetaldehyde deodorization results obtained by pH, total acidity and CO2 analyses evidence the process follow CoIII-MEO. The constant generation of aqueous active CoIII and an electro-scrubbing process offers promise as a means of removing odorous waste gases from gaseous emissions.