By-product coal gas from the steel industry is secondary energy produced from the steel enterprise, which is difficult to reuse because it contains COS and CS2 with the high chemical stability. The by-product coal gas is discharged to the atmospheric environment by some steel enterprises because it is difficult to reuse, which leads to the energy-wasting and environmental pollution. Therefore, many technologies have been developed for the removal of COS and CS2, where hydrolysis method is general desulfurization technology for removing COS and CS2 in the waste gas. However, the operating temperature for the hydrolysis catalysts is relatively high in the present, meanwhile, by-product coal gas from the steel industry has the characteristics of low temperature, low heating value and high content of carbon dioxide and oxygen. Therefore, various low-temperature hydrolysis catalysts have been developed for the single catalytic hydrolysis of COS and CS2, and simultaneously catalytic hydrolysis. The development of these catalysts not only dramatically reduces the operating temperature but remains the excellent hydrolysis efficiency. The catalysts for the single catalytic hydrolysis of COS and CS2 mainly include metal oxide-based catalysts, activated carbon-based catalysts and hydrotalcite-like based catalysts. The metal oxide-based catalysts mainly use γ-Al2O3 and TiO2 as carries, and TiO2-based catalysts possess excellent anti-poisoning performance. The activated carbon-based catalysts can enhance its hydrolysis performance at low temperature by adjusting active components and its content, and improving the quality of activated carbon. The hydrotalcite-like based catalysts have excellent hydro-lysis catalytic performance at low temperature through tailoring their metal components in the brucite-like layers, preparing methods and conditions. Besides, catalysts for simultaneous catalytic hydrolysis of COS and CS2 are mainly the activated carbon-based catalysts, due to activated carbon has special physicochemical characteristics. This review concludes the development of COS and CS2 hydrolysis catalysts at low temperature, and introduces the single catalytic hydrolysis, simultaneous catalytic hydrolysis for COS and CS2, and its catalytic mechanism. Meanwhile, the current problems for the development of low-temperature hydrolysis catalysts are analyzed, and the feasible research directions in the future for the different kinds of low-temperature hydrolysis catalysts are proposed, on which to develop more low-temperature catalysts for the simultaneous hydrolysis of COS and CS2. More importantly, this review provides a reference for the research direction and industrial application of the low-temperature catalysts for the simultaneous hydrolysis of COS and CS2 in the by-product coal gas from the steel industry in the future. © 2021, Materials Review Magazine. All right reserved.
