title: EXAFS and XRD characterization of palladium sorbents for high temperature mercury capture from fuel gas.
abstract: Removal of pollutants such as mercury at elevated temperatures provides improvements in the overall thermal efficiency during the process of coal gasification. The two high temperature sorbents studied were 5 wt% Pd/Al(2)O(3) and 5 wt% Pd/SiO(2): materials shown to have significantly different Hg adsorption capacities. A combination of XRD and EXAFS has been used to characterize the Pd-Hg alloy formed when these Pd-based sorbents were exposed to fuel gas (CO, CO(2), H(2)) containing Hg vapour at 204 degrees C. Significant differences were found in the nature of the alloy formed on the two sorbents following Hg exposure. The Pd/Al(2)O(3) sorbent produced a single homogeneous solid solution of Pd-Hg whilst the silica-supported Pd produced an alloy of varying composition.
authors.affiliation: Johnson Matthey Technology Centre, Blounts Court, Sonning Common, Reading, UK RG4 9NH. Poulss@matthey.com
authors.forename: Stephen
authors.initials: S
authors.lastname: Poulston
authors.forename: Timothy I
authors.initials: TI
authors.lastname: Hyde
authors.forename: Hugh
authors.initials: H
authors.lastname: Hamilton
authors.forename: Olivier
authors.initials: O
authors.lastname: Mathon
authors.forename: Carmelo
authors.initials: C
authors.lastname: Prestipino
authors.forename: Gopinathan
authors.initials: G
authors.lastname: Sankar
authors.forename: Andrew W J
authors.initials: AW
authors.lastname: Smith