Abstract
Reaction of N2 with H2O on gas-phase tungsten clusters Wn+ (n=3–5), probably yielding N2O, was observed at room temperature. Distinct cluster size dependence of N2 activation was found: N2 is activated by W4+ and W5+ to a much greater extent than by W3+. The N2 activation is made possible by bridge adsorption geometry on the clusters. A notable observation is that such an activated N2 adsorption state, that exists only at low temperatures on bulk metal surfaces, survives at room temperature on the tungsten clusters. This is due to the high dissociation barrier for N2 on the clusters.
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