Publications by authors named "Elizabeth I Ross-Medgaarden"
Tungstated zirconia is a robust solid acid catalyst for light alkane (C(4)-C(8)) isomerization. Several structural models for catalytically active sites have been proposed, but the topic remains controversial, partly because of the absence of direct structural imaging information on the various supported WO(x) species. High-angle annular dark-field imaging of WO(3)/ZrO(2) catalysts in an aberration-corrected analytical electron microscope allows, for the first time, direct imaging of the various species present.
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- A variety of TiO(2)/SiO(2) catalysts were developed to incorporate VO(x) and WO(x) active sites for catalytic reactions.
- Characterization techniques like TEM, Raman, and UV-vis spectroscopy helped confirm the properties of these catalysts, revealing that VO(x) sites are redox-active while WO(x) sites have acidic properties.
- The study found that decreasing the size of titania domains (less than 10 nm) enhances acidic activity but reduces redox activity due to their opposing electronic demands, marking a novel approach in modifying catalyst properties using oxide nanoligands.