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Orientation of the acidity probes benzene, acetonitrile and pyridine in SAPO-5 and GaAPO-5 molecular sieves: an FTIR microscopy study

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Demuth,  D.
Johannes Gutenberg-University, Institute of Inorganic Chemistry and Analytical Chemistry, J.J.-Becherweg 24, 55099 Mainz, Germany;
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Schunk,  S.
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;
Johann Wolfgang Goethe-University, Institute of Inorganic Chemistry and Analytical Chemistry, Marie-Curie-Straβe 11, 60439 Frankfurt, Germany;

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Schüth,  F.
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;
Johann Wolfgang Goethe-University, Institute of Inorganic Chemistry and Analytical Chemistry, Marie-Curie-Straβe 11, 60439 Frankfurt, Germany;

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Citation

Jabcobs, W., Demuth, D., Schunk, S., & Schüth, F. (1997). Orientation of the acidity probes benzene, acetonitrile and pyridine in SAPO-5 and GaAPO-5 molecular sieves: an FTIR microscopy study. Microporous and Mesoporous Materials, 10(1-3), 95-109. doi:10.1016/S0927-6513(96)00126-5.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0024-3966-B
Abstract
The adsorption and desorption behaviour of benzene, acetonitrile (CD3CN) and pyridine for large crystals of SAPO-5 and GaAPO-5 is studied using FTIR microscopy with polarised IR radiation. From the analysis of the polarised adsorption bands it is concluded that the adsorbates are ordered in the molecular sieves at 373 K. The orientation of molecules interacting with Brönsted or Lewis acid sites and of physisorbed molecules are discussed. Benzene adsorbed at Brönsted sites is oriented with the aromatic ring parallel to the crystallographic c-axis of the molecular sieve, whereas physisorbed benzene is oriented with the aromatic ring parallel to the crystallographic a,bplane. Acetonitrile can adsorb on top of the Brönsted sites, resulting in an orientation with the CN-axis in the a,bplane. Physisorbed acetonitrile has the CN-axis parallel to the c-axis. Pyridinium ions have their aromatic rings parallel to the a,b-plane. Pyridine molecules at Lewis sites are oriented parallel to the a,b-plane in SAPO-5 and perpendicular to this plane in GaAPO-5. Physisorbed pyridine is oriented with its C2-axis parallel to the c-axis.