Volume 120, Issue 5, 01 February 2004
Index of content:
120(2004); http://dx.doi.org/10.1063/1.1643730View Description Hide Description
The technique of nuclear magnetic resonance cryoporometry has been used to study the behavior of binary liquid mixtures of water and decane in porous sol–gel silicas. It was observed that the water preferentially adsorbed onto the silicasurface and so was able to displace the decane from the pores.
120(2004); http://dx.doi.org/10.1063/1.1644103View Description Hide Description
Reactions of free silver anions with CO, and their mixtures are investigated in a temperature controlled radio frequency ion trap setup. Cluster anions readily react with molecular oxygen to yield 4, or 6) oxide products. In contrast, no reaction of the silvercluster anions with carbon monoxide is detected. However, if silvercluster anions are exposed to the mixture of and CO, new reaction products and a pronounced, discontinuous size dependence in the reaction behavior is observed. In particular, coadsorption complexes are detected for cluster sizes with and 6 and, the most striking observation, in the case of the larger odd atom number clusters and the oxide product concentration decreases while a reappearance of the bare metal cluster signal is observed. This leads to the conclusion that carbon monoxide reacts with the activated oxygen on these silverclusters and indicates the prevalence of a catalyticreaction cycle.