@article {1413435,
	title = {The dynamic behavior of dilute metallic alloy Pd x Au 1- x/SiO 2 raspberry colloid templated catalysts under CO oxidation},
	journal = {Catalysis Science \& Technology},
	year = {2021},
	pages = {4072-4082},
	abstract = {<p xmlns="http://www.rsc.org/schema/rscart38">
	Dilute palladium-in-gold alloys have potential as efficient oxidation catalysts; controlling the Pd surface distribution is critical. Here, the activity for CO oxidation catalyzed by robust dilute Pd-in-Au nanoparticles supported on raspberry-colloid-templated (RCT) silica depends on the pretreatment and gas environment. The activities of oxygen-pretreated catalysts are different in light-off studies\&nbsp;<em>versus</em>\&nbsp;after long-term use. Transient increases in activity are also induced by flowing CO/He at 553 K. Altogether, these results indicate changes in Pd distribution at the surface induced by reactive gases and that light-off studies alone are not adequate for evaluation of alloy catalyst performance. Kinetic studies show evidence of both isolated and multiple Pd atoms. A dual-site mechanism is operative over Pd<small>0.02</small>Au<small>0.98</small>\&nbsp;RCT-SiO<small>2</small>, whereas a single-site mechanism governs reaction over Pd<small>0.10</small>Au<small>0.90</small>\&nbsp;RCT-SiO<small>2</small>. The distinct mechanisms suggest that tuning the ratio of isolated to clustered Pd sites is possible, underscoring the importance of characterization under reaction conditions.
</p>
},
	url = {https://pubs.rsc.org/en/content/articlelanding/2021/CY/D1CY00469G},
	author = {Filie, Amanda and Shirman, Tanya and Aizenberg, Michael and Aizenberg, Joanna and Friend, Cynthia M. and Madix, Robert J.}
}
