실리카지지 루테늄에서 일산화탄소와 산소 공동흡착에 관한 FTIRS 연구

Abstract

살리카 지지 루테늄에서 일산화탄소의 압력, 루테늄 함량, 흡착온도를 변화시키면서 적외선 스펙트럼을 관찰했다. 또한 실리카 지지 루테늄에서 일산화탄소와 산소의 혼합기체의 분압비를 변화시키면서 적외선 스펙트럼을 관찰했다.

실리카 지지 루테늄에 일산화탄소를 흡착시?戮? 때 2004.2-2038.9 ㎝^-1, 2077.5∼2089.0 ㎝^-1, 2141.1∼2145.0 ㎝^-1 세 흡수띠가 관찰되었다. 관찰된 스펙트럼에서 흡수띠의 위치는 문헌에 보고된 바와 거의 일치한다

2077.5∼2089.0 ㎝^-1와 2141.1∼2145.0 ㎝^-1 두 흡수띠의 흡수세기가 산소의 분압을 증가시켰을 때 증가했다. 본 연구의 결과는 실리카 지지 루테늄에 일산화탄소와 산소 혼합기체를 흡착시켰을 때 나타나는 ∼2130 ㎝^-1, 흡수띠와 ∼2080 ㎝^-1 흡수띠는 각각 산화된 루테늄 원자와 그 영향을 받는 루테늄 원자에 흡착된 일산화탄소에서 CO의 신축진동에 의한 것이라는 Brown 등의 주장을 뒷받침한다.

The infrared spectra for CO adsorbed on silica supported ruthenium have been investigated at various partial pressures and temperatures within the frequency range of 1500∼2300 ㎝^-1. Also the infrared spectra for CO/O_2 gas mixtures adsorbed on silica supported ruthenium have been investigated at various partial pressure ratios within the frequency range of 1500∼2300 ㎝^-1.

Three bands (2004.2-2038.9 ㎝^-1, 2077.5∼2089.0 ㎝^-1, 2141.1∼2145.0 ㎝^-1) were observed when CO and O_2 were coadsorbed on silica supported ruthenium. The frequencies of the bands observed correspond with the previous reports approximately.

The relative intensities of 2077.5∼2089.0 ㎝^-1 band and 2141.1∼2145.0 ㎝^-1 band increased with raising O_2 partial pressure. These results support Brown and Gonzalez's argument that ∼2080 ㎝^-1 band and ∼2130 ㎝^-1 band are arised from the CO stretching vibration for CO molecules adsorbed on the ruthenium atoms perturbed by the oxygen atoms bonded to the ruthenium atoms and on the oxidized ruthenium atoms respectively.

The infrared spectra for CO adsorbed on silica supported ruthenium have been investigated at various partial pressures and temperatures within the frequency range of 1500∼2300 ㎝^-1. Also the infrared spectra for CO/O_2 gas mixtures adsorbed on silica supported ruthenium have been investigated at various partial pressure ratios within the frequency range of 1500∼2300 ㎝^-1.

Three bands (2004.2-2038.9 ㎝^-1, 2077.5∼2089.0 ㎝^-1, 2141.1∼2145.0 ㎝^-1) were observed when CO and O_2 were coadsorbed on silica supported ruthenium. The frequencies of the bands observed correspond with the previous reports approximately.

The relative intensities of 2077.5∼2089.0 ㎝^-1 band and 2141.1∼2145.0 ㎝^-1 band increased with raising O_2 partial pressure. These results support Brown and Gonzalez's argument that ∼2080 ㎝^-1 band and ∼2130 ㎝^-1 band are arised from the CO stretching vibration for CO molecules adsorbed on the ruthenium atoms perturbed by the oxygen atoms bonded to the ruthenium atoms and on the oxidized ruthenium atoms respectively.