EXAFS and XRD characterization of palladium sorbents for high temperature mercury capture from fuel gas

Literature Information

Publication Date 2009-11-13
DOI 10.1039/B911941H
Impact Factor 3.676
Authors

Stephen Poulston, Timothy I. Hyde, Hugh Hamilton, Olivier Mathon, Carmelo Prestipino, Andrew W. J. Smith


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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/Al2O3 and 5 wt% Pd/SiO2: 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, CO2, H2) containing Hg vapour at 204 °C. Significant differences were found in the nature of the alloy formed on the two sorbents following Hg exposure. The Pd/Al2O3 sorbent produced a single homogeneous solid solution of Pd–Hg whilst the silica-supported Pd produced an alloy of varying composition.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
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