%0 Journal Article %J Journal of Physical Chemistry %D 1991 %T Nmr-Study of the Distribution of Aromatic-Molecules in Nay Zeolite %A Chmelka, B. F. %A Pearson, J. G. %A Liu, S. B. %A Ryoo, R. %A Demenorval, L. C. %A Pines, A. %K catalysts %X

Local and macroscopic distributions of adsorbed benzene, 1,3,5-trimethylbenzene, and hexamethylbenzene (HMB) molecules among the intracrystalline of NaY zeolite samples have been investigated by Xe-129 and multiple-quantum NMR. Xenon-129 NMR, a sensitive probe of macroscopic distributions of molecules in zeolites at room temperature, demonstrates the importance of sample heat treatment in distributing an adsorbate homogeneously throughout a collection of zeolite particles. NaY samples containing organic guests adsorbed a temperatures near the bulk species' melting point produce multiple or broad xenon lines characteristic of macroscopic (i.e., interparticle) adsorbate concentration gradients. After thorough heat treatment of the samples at elevated temperatures, the xenon spectrum collapses to a single sharp line, consistent with a macroscopically uniform distribution. For HMB adsorbed in NaY, "counting" hydrogen clusters by multiple-quantum NMR reveals intraparticle HMB distributions consistent with one molecular per cavity at low loadings (average bulk loading less-than-or-equal-to 1 molecule per cavity) and two molecules per cavity at higher loadings.

%B Journal of Physical Chemistry %V 95 %P 303-310 %8 Jan 10 %@ 0022-3654 %G English %U ://WOS:A1991ER47300056 %N 1 %M WOS:A1991ER47300056 %! Nmr-Study of the Distribution of Aromatic-Molecules in Nay Zeolite %R Doi 10.1021/J100154a056 %0 Journal Article %J Journal of Physical Chemistry %D 1990 %T Investigations of Adsorbed Organic-Molecules in Na-Y Zeolite by Xe-129 Nmr %A Demenorval, L. C. %A Raftery, D. %A Liu, S. B. %A Takegoshi, K. %A Ryoo, R. %A Pines, A. %B Journal of Physical Chemistry %V 94 %P 27-31 %8 Jan 11 %@ 0022-3654 %G English %U ://WOS:A1990CH53200006 %N 1 %M WOS:A1990CH53200006 %! Investigations of Adsorbed Organic-Molecules in Na-Y Zeolite by Xe-129 Nmr %R Doi 10.1021/J100364a006 %0 Journal Article %J Geochimica Et Cosmochimica Acta %D 1988 %T Diffusive Motion in Alkali Silicate Melts - an Nmr-Study at High-Temperature %A Liu, S. B. %A Stebbins, J. F. %A Schneider, E. %A Pines, A. %B Geochimica Et Cosmochimica Acta %V 52 %P 527-538 %8 Feb %@ 0016-7037 %G English %U ://WOS:A1988M310000028 %N 2 %M WOS:A1988M310000028 %! Diffusive Motion in Alkali Silicate Melts - an Nmr-Study at High-Temperature %R Doi 10.1016/0016-7037(88)90108-1 %0 Journal Article %J Journal of Magnetic Resonance %D 1988 %T Phase-Incremented Multiple-Quantum Nmr Experiments %A Shykind, D. N. %A Baum, J. %A Liu, S. B. %A Pines, A. %B Journal of Magnetic Resonance %V 76 %P 149-154 %8 Jan %@ 0022-2364 %G English %U ://WOS:A1988L955200015 %N 1 %M WOS:A1988L955200015 %! Phase-Incremented Multiple-Quantum Nmr Experiments %R Doi 10.1016/0022-2364(88)90209-0 %0 Journal Article %J Journal of the American Chemical Society %D 1988 %T Probing Metal Cluster Formation in Nay Zeolite by Xe-129 Nmr %A Chmelka, B. F. %A Ryoo, R. %A Liu, S. B. %A Demenorval, L. C. %A Radke, C. J. %A Petersen, E. E. %A Pines, A. %B Journal of the American Chemical Society %V 110 %P 4465-4467 %8 Jun 22 %@ 0002-7863 %G English %U ://WOS:A1988P073900086 %N 13 %M WOS:A1988P073900086 %! Probing Metal Cluster Formation in Nay Zeolite by Xe-129 Nmr %R Doi 10.1021/Ja00221a086 %0 Journal Article %J Journal of Physical Chemistry %D 1987 %T Distribution of Hexamethylbenzene in a Zeolite Studied by Xe-129 and Multiple-Quantum Nmr %A Ryoo, R. %A Liu, S. B. %A Demenorval, L. C. %A Takegoshi, K. %A Chmelka, B. %A Trecoske, M. %A Pines, A. %B Journal of Physical Chemistry %V 91 %P 6575-6577 %8 Dec 31 %@ 0022-3654 %G English %U ://WOS:A1987L663200003 %N 27 %M WOS:A1987L663200003 %! Distribution of Hexamethylbenzene in a Zeolite Studied by Xe-129 and Multiple-Quantum Nmr %R Doi 10.1021/J100311a003 %0 Journal Article %J Chemical Physics %D 1987 %T Multiple Quantum Nmr Excitation with a One-Quantum Hamiltonian %A Suter, D. %A Liu, S. B. %A Baum, J. %A Pines, A. %B Chemical Physics %V 114 %P 103-109 %8 May 15 %@ 0301-0104 %G English %U ://WOS:A1987H433800010 %N 1 %M WOS:A1987H433800010 %! Multiple Quantum Nmr Excitation with a One-Quantum Hamiltonian %R Doi 10.1016/0301-0104(87)80023-X %0 Journal Article %J Physics and Chemistry of Minerals %D 1987 %T Relaxation Mechanisms and Effects of Motion in Albite (Naalsi3o8) Liquid and Glass - a High-Temperature Nmr-Study %A Liu, S. B. %A Pines, A. %A Brandriss, M. %A Stebbins, J. F. %B Physics and Chemistry of Minerals %V 15 %P 155-162 %@ 0342-1791 %G English %U ://WOS:A1987L016700007 %N 2 %M WOS:A1987L016700007 %! Relaxation Mechanisms and Effects of Motion in Albite (Naalsi3o8) Liquid and Glass - a High-Temperature Nmr-Study %R Doi 10.1007/Bf00308778