School of Metallurgical Engineering, Anhui University of Technology, Maxiang Road, Ma'anshan, Anhui province, 243032, China; Department of Chemical/Biochemical Engineering, Western University, 1151 Richmond St, London, Ontario, N6A 5B9, Canada.
School of Metallurgical Engineering, Anhui University of Technology, Maxiang Road, Ma'anshan, Anhui province, 243032, China.
Chemosphere. 2022 Nov;307(Pt 4):136090. doi: 10.1016/j.chemosphere.2022.136090. Epub 2022 Aug 19.
Carbonyl sulfide (COS), a poisonous and harmful gas, is found in industrial gas products from various coal-firing processes. The emission of COS into the atmosphere contributes to aerosol particles that affect the global climate, posing a risk to climate change and population health. In recent years, the total amount of anthropogenic COS emissions has increased significantly, resulting in the prominent COS pollution problem and becoming a vital environmental issue. This review summarizes the research progress of removing COS from industrial gases. According to the characteristics of different industrial gas products, the COS removal mechanism and influence factors, as well as the advantages and disadvantages for various methods, are discussed, including oxidation, absorption/adsorption, hydrogenation, and hydrolysis. Although COS emission control technologies have attracted widespread attention, the progress of application in blast furnace gas purification has been extremely slow, insufficient and sporadic. To fill the gap, this work provides a timely review on blast furnace gas characteristics and application process of various methods for removing COS from blast furnace gas with varying compositions, and their challenges and future development. This work aims to provide guidance on how effective processes and techniques for removal of COS from blast furnace gas can be developed. This review emphasizes the desirability of direct COS removal from blast furnace gas compared to expensive terminal desulfurization technologies. Furthermore, the development of a new process for low-temperature COS removal from blast furnace gas based on a dual-functional catalyst of hydrolysis/adsorption is advocated.
羰基硫（COS）是一种有毒有害气体，存在于各种燃煤工艺的工业气体产品中。COS 排放到大气中会形成气溶胶颗粒，影响全球气候，对气候变化和人口健康构成威胁。近年来，人为 COS 排放量显著增加，导致突出的 COS 污染问题，成为一个重要的环境问题。本综述总结了从工业气体中去除 COS 的研究进展。根据不同工业气体产品的特点，讨论了 COS 去除的机理和影响因素，以及各种方法的优缺点，包括氧化、吸收/吸附、加氢和水解。尽管 COS 排放控制技术引起了广泛关注，但在高炉煤气净化中的应用进展极为缓慢、不足且零星。为了弥补这一空白，本工作及时综述了不同组成的高炉煤气中去除 COS 的各种方法的高炉煤气特性和应用过程，以及它们的挑战和未来发展。本工作旨在为开发有效去除高炉煤气中 COS 的工艺和技术提供指导。本综述强调了与昂贵的终端脱硫技术相比，直接从高炉煤气中去除 COS 的可取性。此外，提倡开发一种基于水解/吸附双功能催化剂的低温高炉煤气去除 COS 的新工艺。
