The interaction of carbon monoxide with clean and surface-modified zinc oxide nanoparticles: A UHV-FTIRS study

作者：Noei Heshmat; Woell Christof; Muhler Martin; Wang Yuemin^*

来源：Applied Catalysis A: General , 2011, 391(1-2): 31-35.

DOI：10.1016/j.apcata.2010.05.015

• Vibrational spectroscopy
• Carbon monoxide
• Zinc oxide
• Infrared spectroscopy
• Carbon dioxide
• Hydroxyl groups
• Heterogeneous catalysis

The interaction of CO with differently modified polycrystalline ZnO has been studied by FTIR spectroscopy under ultrahigh vacuum conditions (UHV-FTIRS). After exposing the clean, adsorbate-free ZnO nanoparticles to CO at 110K we observe an intense vibrational band at 2187 cm(-1) which is assigned to a majority of CO species bound to the Zn2+ sites on the mixed-terminated ZnO(1 0 (1) over bar 0) surface. After the exposure of CO2-pretreated ZnO nanoparticles to CO at 110K, a new CO band is observed at 2215 cm(-1), which originates from CO species adsorbed on the "free" Zn sites embedded within the (2 x 1) tridentate carbonate structure on the ZnO(1 0 (1) over bar 0) surface. UHV-FTIRS data recorded at different sample temperatures demonstrate that the binding energy of CO on polycrystalline ZnO is substantially increased in the presence of pre-adsorbed CO2. The presence of hydroxyl species on the ZnO powder particles does not lead to substantial changes of the CO vibrational bands detected at 110K under UHV conditions.

• 出版日期2011-1-4