TY - JOUR
T1 - Effect of pore size on the adsorption of xenon on mesoporous MCM-41 and on the 129Xe NMR chemical shifts
T2 - A variable temperature study
AU - Chen, Wen Hua
AU - Lin, Hong Ping
AU - Wu, Jin Fu
AU - Jong, Sung Jeng
AU - Mou, Chung Yuan
AU - Liu, Shang Bin
N1 - Funding Information:
The authors thank Profs. Soofin Cheng and Ben-Zu Wan for helpful discussions. This research has been partially supported by a grant from the Chinese Petroleum Corporation (87-S-032) and by the Nation Science Council, R. O. C. (NSC88-2113-M-OO1-008 to SBL).
PY - 2000
Y1 - 2000
N2 - A comprehensive study of the effect of pore size on the adsorption of xenon on mesoporous MCM-41 molecular sieves and 129Xe NMR chemical shifts has been made. 129Xe NMR spectra of MCM-41 samples (Si/Al = 37; pore size 1.8-3.0 nm) with varied xenon loading were obtained at different temperatures (140-340 K). The observed 129Xe NMR chemical shifts were fitted by regressional nonlinear least-squares fitting based on a two-site exchange model. As a result, the temperature variation of 129Xe chemical shifts at zero xenon loading, i.e. δs(ρ = 0) which arise mainly from xenon-wall interactions, were obtained. The pore size (d) and δs can be correlated by an empirical relations: δs(T, d) = A(T)/(d + B(T)). The two parameters, A(T) and B(T), are found to have nearly the same temperature dependence. At low temperature (T < 190 K), the two parameters both increase abruptly with decreasing temperature. Whereas at high temperature (T > 250 K), they were found to slowly decrease with increasing temperature.
AB - A comprehensive study of the effect of pore size on the adsorption of xenon on mesoporous MCM-41 molecular sieves and 129Xe NMR chemical shifts has been made. 129Xe NMR spectra of MCM-41 samples (Si/Al = 37; pore size 1.8-3.0 nm) with varied xenon loading were obtained at different temperatures (140-340 K). The observed 129Xe NMR chemical shifts were fitted by regressional nonlinear least-squares fitting based on a two-site exchange model. As a result, the temperature variation of 129Xe chemical shifts at zero xenon loading, i.e. δs(ρ = 0) which arise mainly from xenon-wall interactions, were obtained. The pore size (d) and δs can be correlated by an empirical relations: δs(T, d) = A(T)/(d + B(T)). The two parameters, A(T) and B(T), are found to have nearly the same temperature dependence. At low temperature (T < 190 K), the two parameters both increase abruptly with decreasing temperature. Whereas at high temperature (T > 250 K), they were found to slowly decrease with increasing temperature.
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U2 - 10.1016/s0167-2991(00)80253-0
DO - 10.1016/s0167-2991(00)80253-0
M3 - Article
AN - SCOPUS:0034590262
SN - 0167-2991
VL - 129
SP - 517
EP - 524
JO - Studies in Surface Science and Catalysis
JF - Studies in Surface Science and Catalysis
ER -