A comparison of nitric oxide decomposition on Pt(210) and Pt(410): An example where an increase in step density has produced a decrease in reactivity
A comparison of nitric oxide decomposition on Pt(210) and Pt(410): An example where an increase in step density has produced a decrease in reactivity
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DOI：
10.1016/0021-9517(85)90024-7
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发表时间：
1985-09
影响因子：
7.3
通讯作者：
J. Gohndrone;Y. Park;R. Masel
中科院分区：
文献类型：
--
作者：
J. Gohndrone;Y. Park;R. Masel
TPD用于比较NO在Pt（210）和Pt（410）上的解离。NO饱和的Pt（210）样品在500 °K处产生一个N2峰，在440和485 °K处产生两个NO峰，约70%的NO解离。通过比较，NO饱和的Pt（410）样品在440 °K处产生单个N2峰，并且NO可忽略不计。这些结果表明，Pt（410）对于NO解离比Pt（210）活性高得多，即使两个表面上的台阶几何形状相同，并且Pt（210）上的台阶密度更高。因此，似乎铂上NO分解的活性部位由特定的原子排列组成，而不仅仅是表面上的一个台阶。
TPD is used to compare the dissociation of NO on Pt(210) and Pt(410). Flash of a NO-saturated Pt(210) sample produces a single N2peak at 500 °K and two NO Peaks at 440 and 485 °K, with about 70% of the NO dissociating. By comparison, flash of an NO-saturated Pt(410) sample yields a single N2peak at 440 °K and negligible NO. These results show that Pt(410) is considerably more active than Pt(210) for NO dissociation even though the step geometry is identical on the two surfaces and the step density is higher on Pt(210). Thus it appears that the active site for NO decomposition on platinum consists of a specific arrangement of atoms and is not just a step on the surface.