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루테늄 촉매표면에서의 화학흡착 및 촉매반응-물의 흡탈착에 관한 연구

Chemisorption and Catalysis on Well-Characterized Ruthenium Surfaces-Adsorption and Desorption of Water-

HWAHAK KONGHAK, October 1982, 20(5), 355-364(10), NONE
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Abstract

루테늄 촉매표면에서의 물의 흡탈착을 극초진공하에서 TDS, AES, LEED 등의 분석기술에 의하여 연구하였다. 물은 실온에서 분해가 되지 않은 분자형태로 흡착하여 1000분의 1이하의 단분자 흡착층을 포화흡착량으로 가지며, 약 380 K에서 최대의 탈착속도를 나타낸다. 고온에서, 물은 표면에 흡착산소원자를 남기면서 분해하며, 약 480 K에서 최대분해속도를 나타낸다. 또한 분해된 표면산소원자의 촉매몸체속으로의 침투현상을 여러 가지 방법의 실험으로 증명하였다.
The adsorption and desorption of water on the surfaces of ruthenium catalysts have been studied using the techniques of uptake, thermal desorption spectroscopy(TDS), Auger electron spectroscopy(AES), and low-energy electron diffraction(LEED) under ultrahigh vacuum conditions. Water adsorbs molecularly at room temperature giving a desorption peak at 380 K and a saturation coverage of less than a thousandth of a monolayer. At higher temperatures water dissociates leaving oxygen adatom, O(a), and the maximum dissociation rate is observed at 480 K. The dissociated surface oxygen is evidenced to penetrate into the subsurface and/or the bulk.

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