title: Three-dimensionally ordered macroporous iron oxide for removal of H2S at medium temperatures.
abstract: A series of iron oxide sorbents with novel structures of three-dimensionally ordered macropores (3DOM), ranging in size from 60 to 550 nm, were fabricated and creatively used as sorbents for the removal of H2S at medium temperatures of 300-350 °C. Evaluation tests using thermogravimetric analysis (TGA) and a fixed-bed reactor showed that, in comparison to the iron oxide sorbent prepared by a conventional mixing method, the fabricated iron oxide sorbent with a 3DOM structure exhibited much higher reactivity and efficiency, as well as high sorbent utilization with low regeneration temperature. The excellent performance of 3DOM iron oxide as a sulfur sorbent is attributed to its special texture, i.e., the open and interconnected macroporous, large surface area, and nanoparticles of iron oxide, which are revealed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and nitrogen adsorption techniques. The investigation results of the pore effect on the performance of the sorbent show that sorbents with pores size around 150 nm in diameter revealed the best performance. The reason is that pores of this size are large enough to allow gas to pass through even if the channel is partially blocked during the reaction process while remaining a large surface area that can provide more active sites for the reaction.
authors.affiliation: State Key Laboratory of Coal Science and Technology, Co-founded by Shanxi Province and the Ministry of Science and Technology, Institute for Chemical Engineering of Coal, Taiyuan University of Technology, West Yingze Street Number 79, Taiyuan 030024, People's Republic of China.
authors.forename: Hui-Ling
authors.initials: HL
authors.lastname: Fan
authors.forename: Ting
authors.initials: T
authors.lastname: Sun
authors.forename: Yan-Peng
authors.initials: YP
authors.lastname: Zhao
authors.forename: Ju
authors.initials: J
authors.lastname: Shangguan
authors.forename: Jian-Ying
authors.initials: JY
authors.lastname: Lin
mesh_terms: D000327:Adsorption; D005290:Ferric Compounds / Q000737:chemistry*; D006358:Hot Temperature; D006862:Hydrogen Sulfide / Q000302:isolation & purification*; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D014961:X-Ray Diffraction
chemical_list: D005290:Ferric Compounds; C000499:ferric oxide; D006862:Hydrogen Sulfide