By D. P. Woodruff
Atomic Clusters: From fuel part to Deposited brings jointly a chain of chapters, ready by way of said specialists of their fields. either primary and useful facets are addressed of the physics and chemistry of a singular country of subject, particularly clusters of small numbers of atoms of nanometre dimensions. this can be a box of nanoscience that existed prior to the be aware used to be invented, yet has rather accomplished significant advances within the contemporary years.
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Additional resources for Atomic Clusters: From Gas Phase to Deposited
NO reduction was observed only at temperatures where NO dissociates upon adsorption and it was concluded that NO reduction exclusively occurs via dissociative NO adsorption. Two different types of adsorbed nitrogen atoms, N(a), were Size effects in the chemistry of small clusters 33 proposed, with one type being more strongly bound to the surface than the other one. The more strongly bound N(a) poisons the active sites of the particle surface. Furthermore, it was found that the efﬁciency of the CO2 formation depends on the structure and thus the size of Pd nanoparticles.
12N2 þ CO2 reaction has been extensively investigated on Pd single crystals as well as on supported nanoparticles [71–84]; only a short summary is given here. For our discussion, the most important result from single crystal studies is the structure sensitivity of the reaction. As the ﬁrst step of the reaction, the adsorption of NO was investigated. It was found that while NO is molecularly adsorbed on the close-packed Pd(1 1 1) surface up to elevated temperatures, on more open surfaces NO readily dissociates upon adsorption.
18 eV) and remains in its triplet state. In the case of the Sr-doped cluster there are strong resonances between the electronic states located on the impurity atom and O2, leading to substantial backdonation into the spin-down 2pÃ? orbital of oxygen. 37 A˚. This is 18 MATTHIAS ARENZ, STEFAN GILB AND UELI HEIZ Figure 13: TPR spectra of CO2 formation on (a) an MgO(1 0 0) ﬁlm, (b) Au3Sr/MgO(FC), (c) Au4/MgO (FC), (d) Au8/MgO(FC), and (e) a thick gold ﬁlm grown on MgO(1 0 0). The Au4/MgO(FC), pure MgO ﬁlm, and the thick Au ﬁlm are catalytically inert.
Atomic Clusters: From Gas Phase to Deposited by D. P. Woodruff