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

Poulston, S; Hyde, TI; Hamilton, H; Mathon, O; Prestipino, C; Sankar, G; Smith, AWJ; (2010) EXAFS and XRD characterization of palladium sorbents for high temperature mercury capture from fuel gas. PHYS CHEM CHEM PHYS , 12 (2) 484 - 491. 10.1039/b911941h.

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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, 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/Al2O3 sorbent produced a single homogeneous solid solution of Pd-Hg whilst the silica-supported Pd produced an alloy of varying composition.

Type:Article
Title:EXAFS and XRD characterization of palladium sorbents for high temperature mercury capture from fuel gas
DOI:10.1039/b911941h
Keywords:SUPPORTED METAL NANOPARTICLES, PLATINUM GROUP CATALYSTS, BENZENE HYDROGENATION, THERMAL DESORPTION, COAL-GASIFICATION, GASIFIER, REMOVAL, ALLOYS, PDAU, SIZE
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry

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