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KMID : 1059520090530030233
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Journal of the Korean Chemical Society
2009 Volume.53 No. 3 p.233 ~ p.243
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An IRS Study on the Adsorption of Carbonmonoxide on Silica Supported Ni-Cu Alloys
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Ahn Jeong-Soo
Yoon Koo-Sik
Park Sang-Youn
Park Sung-Kyun
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Abstract
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We have investigated the infrared spectra for CO adsorbed on silica supported nickel(Ni-SiO2),silica supported copper(Cu-SiO2), silica supported nickel-copper alloys(Ni/Cu-SiO2) of several compositions with varying CO pressures(0.2 torr∼50 torr) at room temperature and on pumping to vacumn at room temperature within the frequency range of 1500 cm-1 ∼2500 cm-1. Four bands(2059.6 cm-1, ∼2036.5 cm-1, ∼ 1868.7 cm-1, ∼1697.1 cm-1) were observed for Ni-SiO2, two bands(∼2115.5 cm-1, ∼1743.0 cm-1) were observed for Cu-SiO2 and five bands(∼2123.2 cm-1, 2059.6 cm-1,∼2036.4 cm-1, ∼1899.5 cm-1, ∼1697.1 cm-1) were observed for Ni/Cu-SiO2. These absorption bands correspond with those of the previous reports approximately. The bands below 1800 cm-1 were only observed with Ni metal or Ni/Cu alloy crystal plane containing step at room temperature and the ∼1697.1 cm-1 bands observed with Ni-SiO2 and Ni/Cu-SiO2 may
be ascribed to CO molecule adsorbed on the adsorption sites near step. The bands below 2000 cm-1 were rarely observed with Cu metal crystal plane at room temperature and the 1743.0 cm-1 bands may be ascribed to CO molecule adsorbed on the adsorption sites near step. The band shifts of adsorbed CO with varing Cu contents from 0 to 0.5 mole fraction at the same CO pressure or at the same pumping time to vacumn were below 21 cm-1. and comparatively small than those with other ⅠB metal addition. It may means ligand effect of Cu delectron is small.
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KEYWORD
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CO adsorption, Ni/Cu alloy, Silica supported Ni/Cu alloy, CO adsorption on silica supported Ni/Cu alloy
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