FTIR Study of Carbon Monoxide Oxidation and Scrambling at Room Temperature over Gold Supported on ZnO and TiO2. 2
FTIR Study of Carbon Monoxide Oxidation and Scrambling at Room Temperature over Gold Supported on ZnO and TiO2. 2
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DOI：
10.1021/jp950542g
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发表时间：
1996-02
期刊：
影响因子：
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通讯作者：
F. Boccuzzi;A. Chiorino;S. Tsubota;M. Haruta
中科院分区：
文献类型：
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作者：
F. Boccuzzi;A. Chiorino;S. Tsubota;M. Haruta
提出了 16O2 和 18O2 在 ZnO 和 TiO2 负载的铜上吸附和氧化 CO 的 FTIR 和四极杆质谱研究。实验结果表明，CO在两种氧化物上分散的金属颗粒上被吸附在两种位点上：正常阶地位点和颗粒边界处的位点。此外，在二氧化钛上，检测到 2126 cm-1 处的谱带，该谱带归属于吸附在孤立的铜原子和/或二维小簇上的 CO。 CO−O2 共吸附实验中观察到的金属颗粒上吸附的 CO 能带的频移以及 CO 和 18O2 之间发生的扰乱反应表明，在所有这些样品上，都存在能够同时吸附氧原子和一氧化碳的金属位点。形成二氧化碳和碳酸盐类物质：CO2 的不对称伸缩频率和四极杆质谱分析表明，对于 18O2，不同同位素分子 CO2 的...
An FTIR and quadrupole mass spectroscopic study of CO adsorption and oxidation with 16O2 and 18O2 on copper supported on ZnO and TiO2 is presented. The experimental results indicate that CO is adsorbed on the metallic particles dispersed on both oxides on two kinds of sites, on the normal terrace sites and on sites at the borderline of the particles. Moreover, on titania, a band at 2126 cm-1, assigned to CO adsorbed on isolated Cu atoms and/or on two-dimensional small clusters, is detected. A frequency shift of the bands of CO adsorbed on the metallic particles observed in the CO−O2 coadsorption experiments and the occurrence of a scrambling reaction between CO and 18O2 reveal that on all these samples, there are metallic sites which are able to adsorb at the same time oxygen atoms and carbon monoxide. Carbon dioxide and carbonate-like species are formed: the asymmetric stretching frequencies of CO2 and the quadrupole mass spectroscopic analysis reveal that with 18O2, different isotopic molecular CO2's a...