title: Selective catalytic oxidation of H₂S over iron oxide supported on alumina-intercalated Laponite clay catalysts.
abstract: A series of iron oxide supported on alumina-intercalated clay catalysts (named Fe/Al-Lap catalysts) with mesoporous structure and high specific surface area were prepared. The structural and chemical properties were studied by nitrogen sorption isotherms, X-ray diffraction (XRD), UV-vis diffuse reflectance spectra (UV-vis DRS), X-ray photoelectron spectra (XPS), Fourier transform infrared spectroscopy (FTIR), H₂ temperature-programmed reduction (H₂-TPR) and NH₃ temperature-programmed desorption (NH3-TPD) techniques. It was realized that iron oxide mainly existed in the form of isolated Fe(3+) in an oxidic environment. Fe/Al-Lap catalysts showed high catalytic activities in the temperature range of 120-200 °C without the presence of excessive O₂. This can be attributed to the interaction between iron oxide and alumina, which improve the redox property of Fe(3+) efficiently. In addition, the strong acidity of catalysts and good dispersion of iron oxide were also beneficial to oxidation reaction. Among them, 7% Fe/Al-Lap catalyst presented the best catalytic performance at 180 °C. Finally, the catalytic and deactivation mechanisms were explored.
authors.affiliation: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China.
authors.forename: Xin
authors.initials: X
authors.lastname: Zhang
authors.forename: Guangyu
authors.initials: G
authors.lastname: Dou
authors.forename: Zhuo
authors.initials: Z
authors.lastname: Wang
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.forename: Yufei
authors.initials: Y
authors.lastname: Wang
authors.forename: Hailin
authors.initials: H
authors.lastname: Wang
authors.forename: Zhengping
authors.initials: Z
authors.lastname: Hao
mesh_terms: D000393:Air Pollutants; D000537:Aluminum Oxide / Q000737:chemistry*; D000538:Aluminum Silicates / Q000737:chemistry; D002384:Catalysis; D000077215:Clay; D004785:Environmental Pollutants / Q000032:analysis; D005290:Ferric Compounds / Q000737:chemistry*; D006862:Hydrogen Sulfide / Q000737:chemistry*; D007220:Industrial Waste; D007221:Industry; D007501:Iron / Q000737:chemistry; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*; D056951:Photoelectron Spectroscopy; D017640:Silicates / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D013455:Sulfur / Q000737:chemistry; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: D000393:Air Pollutants; D000538:Aluminum Silicates; D004785:Environmental Pollutants; D005290:Ferric Compounds; D007220:Industrial Waste; D017640:Silicates; C000499:ferric oxide; D013455:Sulfur; C524813:laponite; D007501:Iron; D000537:Aluminum Oxide; D010100:Oxygen; D000077215:Clay; D006862:Hydrogen Sulfide
keywords: Alumina-intercalated clay; Catalyst deactivation; H(2)S selective oxidation; Sulfur selectivity; Sulfur yield