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백금표면에서 흡착과정에 미치는 물의 영향(I. 수소흡착과정에 미치는 일산화탄소와 물의 영향)

Water-Induced Effects on the Adsorption on Polycrystalline Platinum(I. The effects of carbon monoxide and water on the adsorption of hydrogen)

HWAHAK KONGHAK, April 1985, 23(2), 79-87(9), NONE
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Abstract

백금 촉매표면에서 수소의 흡탈착에 미치는 물의 영향에 관한 연구가 극초진공하에서 열탈착의 분석기술에 의하여 수행되었다. 310 K에서 백금표면에 선흡착된 일산화탄소는 수소가 흡착하는 것을 강하게 방해하여 일산화탄소의 피복률이 증가할수록 수소의 흡착량은 현저하게 감소하며, 20 L이상의 일산화탄소에 노출시킨 백금표면에서는 수소의 흡착이 불가능해진다. 포화흡착된 수소는 1×10-b Torr의 일산화탄소를 310 K에서 30초동안 노출시킴에 의해서 완전히 일산화탄소와 치환된다. 310 K에서 물은 수소의 흡탈착에 직접적인 영향을 미치지는 못하나, 계내에 도입된 물과 백금표면에 존재하는 일산화탄소나 일산화탄소의 분해흡착에 의한 탄소원자와의 수성가스 생성반응에 의하여 수소탈착곡선상에 두 개의 새로운 피크(590, 790 K)가 생겨나게 한다.
The effects of carbon monoxide and water on the adsorption and desorption of hydrogen on the surface of polycrystalline platinum foil have been studied using the technique of thermal desorption spectroscopy(TDS) under ultrahigh vacuum(UHV) conditions. The carbon monoxide preadsorbed on the surface of platinum at 310 K strongly prevents hydrogen from adsorbing on the platinum. As the coverage of carbon monoxide increases, the amount of hydrogen adsorption decreases. After the platinum surface is predosed with more than 20 L of carbon monoxide, the hydrogen adsorption is entirely blocked. Water gives no direct effects on the adsorption and desorption of hydrogen at 310 K. However, existence of water makes two new peaks(590, 790 K) appear on the hydrogen desorption spectrum. This is believed to be due to water-gas shift reaction between water in the system and carbon monoxide or carbon species deposited on the catalyst surface.

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