Abstract
The influence of NO on the adsorption of D 2 on the Pt(100)–(hex) surface was studied by means of temperature-programmed reaction (TPR). Deuterium adsorbs negligibly on Pt(100)–(hex) at T=270 K, whereas an addition of a small amount of NO to D 2 increases drastically the adsorption capacity of Pt(100)–(hex) towards deuterium. The same phenomenon was observed on the surface pre-covered with NO ads as well. As the NO ads pre-coverage increases, the uptake of D ads first increases, then reaches a maximum at θ NO≈0.25 ML, and finally falls down to zero for the NO ads saturated layer. The following explanation is supposed. Upon adsorption on the Pt(100)–(hex) surface, NO lifts the (hex) reconstruction and forms the dense NO ads/(1×1) islands surrounded by the clean (hex) surface. A limited area of the (hex) phase, which is immediately adjacent to the boundaries of the NO ads/(1×1) islands, is supposed to be distorted and could be able to adsorb deuterium.
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