Removal of H₂S from Biogas by Iron (Fe³⁺) Doped MgO on Ceramic Honeycomb Catalyst using Double Packed Columns System

Abstract

Hydrogen sulfide is a toxic and corrosive in nature, gas should be safely removed from the biogas streams before subjecting into the fuel cell. Fe³⁺ doped magnesium oxide was synthesized using sol-gel technique and dip coating process of Fe³⁺ doped MgO on foam ceramic honeycomb. XRD and SEM indicate that Fe³⁺ in Fe³⁺ doped MgO on foam ceramic honeycomb catalyst is finely dispersed in the MgO support. Performance of the synthesized Fe³⁺ doped magnesium oxide on the honeycomb catalyst was examined for hydrogen sulfide (H₂S) oxidation by double packed column scrubbers. The absorption column was used for H₂S scrubbing from biogas by deionized water absorption and catalytic column was used as catalyst bed for degradation of absorbed H₂S in scrubbing water. In the catalytic column, counter current flow of the scrubbing water and air through the catalyst pack was performed for H₂S oxidation accompany with catalyst regeneration. System capacity for H₂S removal from gas stream showed 98% constant along 3 hr testing time at room temperature.