[논문]Precise control of heat-treatment conditions to improve the catalytic performance of V2O5/TiO2 for H2S removal

Yang, Jae Hwan; Lee, Hyun Ji; Lee, Hyun Soo; Jeon, Sang-Chae; Han, Young-Soo

doi:10.1016/j.jhazmat.2021.125974

[해외논문] Precise control of heat-treatment conditions to improve the catalytic performance of V2O5/TiO2 for H2S removal

Journal of hazardous materials, v.416, 2021년, pp.125974 -

Yang, Jae Hwan (Department of Environmental Engineering, Chungnam National University) , Lee, Hyun Ji (Department of Environmental Engineering, Chungnam National University) , Lee, Hyun Soo (Department of Environmental Engineering, Chungnam National University) , Jeon, Sang-Chae (School of Materials Science and Engineering, Changwon National University) , Han, Young-Soo (Department of Environmental Engineering, Chungnam National University)

Abstract ▼ AI-Helper

Abstract The purpose of this study is to investigate the influences of atmospheric gas and temperature while preparing V2O5/TiO2 catalysts to find a suitable heat-treatment method to improve catalytic performance during the process of H2S removal. The catalysts prepared by wet-impregnation were heat-treated at different temperatures (400 or 600 ℃) under various atmospheres (Air, N2, or H2). The catalytic tests demonstrated that the catalyst heat-treated at 400 ℃ under N2 atmosphere (N-400) possessed excellent catalytic activities regarding H2S conversion (96.4%) and sulfur yield (89.1%). The characterization results revealed that the mild reducing condition employed for N-400 led to the formation of partially reduced V2O5 crystals and a strong V-Ti interaction owing to the anatase TiO2 phase, resulting in the high oxygen vacancies on the catalyst surface. However, severe reducing conditions (H2 or N2 with 600 ℃) or the higher temperature (600 ℃) induced highly reduced V2O5−x or rutile TiO2 related to a weak V-Ti interaction, respectively, which facilitated lower oxygen vacancies. This study is the first to demonstrate the significance of a precisely controlled heat-treatment to enhance catalytic performance for H2S removal. Highlights Effects of heat-treatment conditions for V2O5/TiO2 catalysts were investigated. The mild reducing condition promoted the formation of O vacancies as active sites. The best N-400 exhibited 96% of H2S conversion and 93% of S selectivity at 120 ℃. Highly reduced vanadia is unfavorable for catalysis owing to fewer O vacancies. Rutile TiO2 formed at 600 ℃ showed lower V-Ti interaction and catalytic activities. Graphical Abstract [DISPLAY OMISSION]

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