title: Property and performance of red mud-based catalysts for the complete oxidation of volatile organic compounds.
abstract: Red mud (RM) was assessed as a catalyst for the complete oxidation of volatile organic compounds (VOCs). The catalytic activity of RM was influenced by an acid treatment and the calcination temperature. Acid-treated RM (HRM) catalysts with a platinum loading (Pt/HRM) were prepared using a conventional impregnation method. Platinum catalysts supported on γ-Al2O3 (Pt/Al) were prepared for comparison. The physicochemical properties of the RM, HRM and Pt/HRM catalysts were characterized by BET analysis, ICP-AES, H2-TPD, XRD, FTIR, SEM, and FE-TEM. The acid treatment increased the BET surface area of the RM significantly, resulting in an increase in catalytic activity. Increasing the calcination temperature from 400°C to 600°C caused a decrease in its catalytic activity. Increasing the platinum loading on HRM(400) from 0.1 wt.% to 1 wt.% led to an increase in the toluene conversion, which was attributed to the better redox properties. The catalytic activities of the Pt/HRM(400) catalysts were superior to those of the Pt/Al catalysts. Benzene, toluene, o-xylene, and hexane were oxidized completely over the 1 wt.% Pt/HRM(400) catalyst at reaction temperatures less than 280°C. The presence of water vapor in the feed had a negative effect on the activity of the 1 wt.% Pt/HRM(400) catalyst.
authors.affiliation: Department of Environmental Education, Mokpo National University, 1666 Youngsan Ro, Cheonggye Myeon, Muan 534-729, Republic of Korea. Electronic address: gikim@mokpo.ac.kr.
authors.forename: Sang Chai
authors.initials: SC
authors.lastname: Kim
authors.affiliation: Department of Environmental Education, Mokpo National University, 1666 Youngsan Ro, Cheonggye Myeon, Muan 534-729, Republic of Korea.
authors.forename: Seung Won
authors.initials: SW
authors.lastname: Nahm
authors.affiliation: School of Environmental Engineering, University of Seoul, 163 Siripdae Ro, Dongdaemun Gu, Seoul 130-743, Republic of Korea.
authors.forename: Young-Kwon
authors.initials: YK
authors.lastname: Park
keywords: Complete oxidation; Lattice oxygen; Platinum; Red mud; Volatile organic compounds