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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 22, Number 5
JKCSEZ 22(5)
October 20, 1978 

Statistical thermodynamics of Physical Adsorption of Benzene and p-Xylene

벤젠과 p-크실렌의 물리흡착에 대한 통계열역학적 고찰
Woon-Sun Ahn, Kwang-Soon Lee, Hyun-Tai Kwak

안운선, 이광순, 곽현태
흑연과 산화알루미늄(Alucer) 표면에 흡착된 벤젠이나 p-크실렌분자가 submonolayer 영역에서 어떤 흡착상태를 이루고 있는가를 이론적으로 살펴보기 위하여, 이들 흡착질 분자를 2차원 기체와 조화진동자의 두가지 모형으로 가정하고 통계열역학적으로 흡착엔트로피를 계산하여 실험치와 비교하였다. 그 결과 벤젠은 흑연표면에서 조화진동 운동을 하며, 산화알루미늄 표면에서는 비편재된 상태에 있다는 것을 알게 되었다. 흡착제 표면에서 흡착된 분자가 조화진동 운동을 한다고 가정할 경우 조절가능한 파라미터로 도입된 분자진동수는 1011sec-1로서 대단히 합리적인 값을 얻었다. p-크실렌분자가 흑연이나 산화알루미늄 표면에 흡착될 때는 단분자층이 이루어지기 훨씬 전에 비정상적인 값들이 나타난다.

In this paper, for the purpose of studying the adsorbed states of benzene and p-xylene molecules on both of the Spheron 6(graphitized carbon) and the Alucer(aluminium oxides), we have calculated the differential molar entropies of adsorption in the Submonolayer region, by the use of statistical thermodynamics. The models we have adopted are two-dimensional gases and the harmonic oscillators. The values calculated in this way are compared with experimental values. As a result, it is believed that the adsorbed benzene molecules are localized on the Spheron 6, whereas on the Alucer it is nonlocalized. The molecular frequency, which is an adjustable parameter and is introduced as a result of oscillator model is 1011 sec-1 in the order of magnitude. For the case of p-xylene molecules adsorbed on these adsorbents, an abnormal result is obtained quite prior to the monolayer coverage, contrarily to the expectation of similar results as for the case of benzene.

289 - 294
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