Effect of pore size on the adsorption of xenon on mesoporous MCM-41 and on the 129Xe NMR chemical shifts: a variable temperature study
作者： Wen-Hua Chen , Hong-Ping Lin , Jin-Fu Wu , Sung-Jeng Jong , DgChung-Yuan Mou
DOI: 10.1016/S0167-2991(00)80253-0
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摘要: A comprehensive study of the effect pore size on adsorption xenon mesoporous MCM-41 molecular sieves and 129Xe NMR chemical shifts has been made. spectra samples (Si/Al = 37; 1.8-3.0 nm) with varied loading were obtained at different temperatures (140-340 K). The observed fitted by regressional nonlinear least-squares fitting based a two-site exchange model. As result, temperature variation zero loading, i.e. δs(ρ 0) which arise mainly from xenon-wall interactions, obtained. (d) δs can be correlated an empirical relations: δs(T, d) A(T)/(d + B(T)). two parameters, A(T) B(T), are found to have nearly same dependence. At low (T 190 K), parameters both increase abruptly decreasing temperature. Whereas high 250 they slowly decrease increasing
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