Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 416, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.125974
Keywords
V2O5/TiO2 catalysts; H2S removal; Heat-treatment; Atmospheric gas; Temperature; Oxygen vacancies
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Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF-2018R1C1B5085444]
- Korea Ministry of Environment (MOE) as Waste to Energy Recycling Human Resource Development Project
- Daejeon Green Environment Center under the Research Development Program (Yr 2019)
- Ministry of Educational Science and Technology of the Korean Government
- Pohang University of Science and Technology (POSTECH)
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The results suggested that the catalyst heat-treated at 400 degrees C under N-2 atmosphere (N-400) exhibited excellent catalytic performance for H2S removal, with high H2S conversion and sulfur yield. The study highlighted the importance of precisely controlled heat-treatment to enhance catalytic activity for H2S removal.
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 degrees C) under various atmospheres (Air, N-2, or H-2). The catalytic tests demonstrated that the catalyst heat-treated at 400 degrees C under N-2 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 (H-2 or N-2 with 600 degrees C) or the higher temperature (600 degrees C) 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.
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