Institute of Surface Chemistry and Catalysis, Ulm University, 89069 Ulm, Germany.
Chemphyschem. 2010 May 17;11(7):1482-90. doi: 10.1002/cphc.200900839.
The influence of pre-adsorbed hydrogen on the adsorption of CO on well-defined PtRu/Ru(0001) surface alloys and the modification of the adsorption properties of both adsorbate species due to coadsorption was studied by a combination of temperature-programmed desorption and infrared spectroscopic measurements. The hydrogen binding strength is weakened both by surface alloy formation and by CO coadsorption. In the densely packed coadsorbate layers, which can be formed after CO post-adsorption, the adsorption properties of the adsorbed CO molecules are also affected significantly. Depending on the Pt surface concentration, the CO adsorption process on hydrogen pre-covered surfaces is blocked to a different extent with a decreasing blocking tendency for Pt-rich alloys.
通过程序升温脱附和红外光谱测量相结合的方法，研究了预吸附氢对在高度有序的 PtRu/Ru(0001)表面合金上 CO 的吸附以及由于共吸附引起的两种吸附物种吸附性能变化的影响。表面合金的形成和 CO 的共吸附都会削弱氢的结合强度。在 CO 后吸附后可以形成的密集共吸附层中，吸附的 CO 分子的吸附性质也受到显著影响。取决于 Pt 的表面浓度，在氢预覆盖表面上 CO 的吸附过程受到不同程度的抑制，富 Pt 合金的抑制趋势降低。
