An infrared study of CO and NO adsorption on alumina-supported iridium catalyst
An infrared study of CO and NO adsorption on alumina-supported iridium catalyst
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DOI：
10.1016/0021-9517(80)90453-4
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发表时间：
1980-04
影响因子：
7.3
通讯作者：
F. Solymosi;J. Rasko
中科院分区：
文献类型：
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作者：
F. Solymosi;J. Rasko
用红外光谱法研究了还原态和氧化态Ir/γ-Al_2O_3上NO和CO的吸附行为。还原后的样品吸附NO，在1900和1850 cm−1处产生谱带。这些谱带分别归因于NO以NO+δ形式吸附在较大铱微晶的金属原子上（A位）和受载体强烈影响的铱原子上（B位）。吸附在氧化样品上的NO的光谱仅显示在1950 cm−1处的单一谱带。该谱带被指定为部分氧化的Ir位点上的NO+δ。还原样品上的CO吸附在2070-2060和2020 cm−1处产生谱带，分别与线性键合到A位和B位的CO相关。样品的氧化和随后的CO吸附仅在2060 cm−1处产生一个带，该带被指定为与位点A线性键合的CO。详细研究了压力、吸附温度和不同温度下的抽真空对上述谱带强度的影响。
Infrared spectroscopic measurements were performed for NO and CO adsorbed on reduced and oxidized Ir supported on γ-Al2O3. Adsorption of NO on a reduced sample produced bands at 1900 and 1850 cm−1. These bands are attributed to NO adsorbed as NO+δon metal atoms of larger iridium crystallites (Site A) and on iridium atoms influenced strongly by the support (Site B), respectively. Spectra of NO adsorbed on an oxidized sample showed only a single band at 1950 cm−1. This band is assigned as NO+δon partially oxidized Ir sites. CO adsorption on a reduced sample produced bands at 2070-2060 and 2020 cm−1, which are associated with CO linearly bonded to Site A and Site B, respectively. Oxidation of the sample and subsequent adsorption of CO caused a band only at 2060 cm−1, which is assigned as CO linearly bonded to Site A. Detailed investigations were made on the effect of the pressure, adsorption temperature, and evacuation at different temperatures on the intensities of the above bands.