Hydrogen sulfide (H2S) is a flammable, corrosive and lethal gas even at low concentrations (ppm levels). Hence, the capture and removal of H2S from various emitting sources (such as oil and gas processing facilities, natural emissions, sewage treatment plants, landfills and other industrial plants) is necessary to prevent and mitigate its adverse effects on human (causing respiratory failure and asphyxiation), environment (creating highly flammable and explosive environment), and facilities (resulting in corrosion of industrial equipment and pipelines). In this review, the state-of-the-art technologies for H2S capture and removal are reviewed and discussed. In particular, the recent technologies for H2S removal such as membrane, adsorption, absorption and membrane contactor are extensively reviewed. To date, adsorption using metal oxide-based sorbents is by far the most established technology in commercial scale for the fine removal of H2S, while solvent absorption is also industrially matured for bulk removal of CO2 and H2S simultaneously. In addition, the strengths, limitations, technological gaps and way forward for each technology are also outlined. Furthermore, the comparison of established carbon capture technologies in simultaneous and selective removal of H2S–CO2 is also comprehensively discussed and presented. It was found that the existing carbon capture technologies are not adequate for the selective removal of H2S from CO2 due to their similar characteristics, and thus extensive research is still needed in this area.
|Number of pages||20|
|Early online date||20 Sept 2022|
|Publication status||Published - 1 Dec 2022|
Bibliographical noteFunding Information:
The authors gratefully acknowledge the support from the head of all organizations involved and the permission to publish the findings. The authors would like to thank The Education University of Hong Kong and Universiti Malaysia Terengganu for the financial support under International Grant ( UMT/CRIM/2-2/25/JLD 8 , Vot 53376). The work is also supported by Program for Innovative Research Team (in Science and Technology) in University of Henan Province (No. 21IRTSTHN020 ) and Central Plain Scholar Funding Project of Henan Province (No. 212101510005 ).
© 2022 Elsevier Ltd