title: Structural effect of the in situ generated titania on its ability to oxidize and capture the gas-phase elemental mercury.
abstract: Structural effect of the in situ generated TiO(2) sorbent particle was examined for its ability to capture elemental mercury under UV irradiation in a simulated combustion flue gas. Titania particles were prepared by thermal gas-phase oxidation of Titanium (IV) isopropoxide (TTIP) using a high temperature electric furnace reactor. The structural characteristics of the in situ generated TiO(2) at various synthesis temperatures were investigated; size distribution and the geometric mean diameter were measured using a scanning mobility particle sizer, while fractal dimension and radius of gyration were evaluated from the transmission electron microscopy images. Results from the Hg(0) capture experiment show that with increasing titania synthesis temperature, the overall aggregate size increases and the morphology becomes more open-structured to gas-phase Hg(0) and UV light, resulting in the improved mercury removal capability.
authors.affiliation: Department of Chemical Engineering, Yonsei University, 134 Sinchon-dong, Seodaemun-gu, Seoul 120-749, Republic of Korea. teddy.lee@yonsei.ac.kr
authors.forename: Tai Gyu
authors.initials: TG
authors.lastname: Lee
authors.forename: Jung Eun
authors.initials: JE
authors.lastname: Hyun
mesh_terms: D000327:Adsorption; D000393:Air Pollutants / Q000032:analysis*; D002384:Catalysis; D005740:Gases / Q000032:analysis*; D017745:Incineration / Q000295:instrumentation; D008628:Mercury / Q000032:analysis*; D010316:Particle Size; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays
chemical_list: D000393:Air Pollutants; D005740:Gases; C009495:titanium dioxide; D014025:Titanium; D008628:Mercury