73 research outputs found
The outlook for the metropolitan area
No full textThe author assesses the region's future and identifies policies that might improve the local outlook. He acknowledges that substantial cuts in the local tax burden could increase growth but doubts whether local governments could afford such widespread reductions. Instead, he argues, it would be more beneficial for authorities to seek ways to lower the cost of doing business in the region, possibly by reducing taxes levied on intermediate goods and services purchased by businesses.New York (N.Y.) ; Federal Reserve District, 2nd
From Vanadia Nanoclusters to Ultrathin Films on TiO2(110): Evolution of the Yield and Selectivity in the Ethanol Oxidation Reaction
No full textOxide-on-oxide systems are becoming increasingly important in nanocatalysis and surface engineering, because of the creation of hybridized interfaces holding high reactivity and selectivity toward oxidation reactions. Here we report on the results of a multitechnique surface science study conducted on an oxide/oxide model system. By depositing increasing amounts of vanadium oxide (VOx) on a titanium dioxide-rutile(110) substrate, we were able to follow the morphology and oxidation state of the overlayer. Three growth modes were detected: nanoclusters at low coverage (0.3 and 0.5 monolayer), one-dimensional strands aligned along the substrate [001] direction at monolayer coverage, and three-dimensional nanoislands at higher coverage (2.0 and 5.0 monolayers). All these structures share the same oxidation state (V2O3). We studied the reactivity and selectivity of these model catalysts toward partial oxidation of ethanol, finding that both of them depend on the VOx thickness. Nanoclusters can yield acetaldehyde through low-temperature oxidative dehydrogenation but show a scarce selectivity in the investigated temperature range. The monolayer coverage is the most reactive toward ethanol dehydration to ethylene, showing also good selectivity. Similar results are found at high coverage, although the overall reactivity of the systems toward alcohol oxidation decreases
Symmetry, orientation and surface chemistry of aromatic molecules on transition metal surfaces
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Synchrotron x-ray photoemission study of soft x-ray processed ultrathin glycine-water ice films
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