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Acid properties of NaKH-ferrierites of various exchange degrees studied by IR spectroscopy

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Acid properties of NaKH-ferrierites of various exchange degrees studied by IR spectroscopy

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dc.contributor.author Datka, Jerzy [SAP11003748] pl
dc.contributor.author Kawałek, Marek pl
dc.contributor.author Góra-Marek, Kinga [SAP11018751] pl
dc.date.accessioned 2015-09-25T11:55:52Z
dc.date.available 2015-09-25T11:55:52Z
dc.date.issued 2003 pl
dc.identifier.issn 0926-860X pl
dc.identifier.uri http://ruj.uj.edu.pl/xmlui/handle/item/15797
dc.language eng pl
dc.title Acid properties of NaKH-ferrierites of various exchange degrees studied by IR spectroscopy pl
dc.type JournalArticle pl
dc.description.physical 293-299 pl
dc.abstract.en The H/Na,K exchange was studied as one of the methods of modification of the acid properties of ferrierite. The concentration of Brönsted acid sites was determined, their acid strength and heterogeneity were followed by quantitative IR studies of ammonia desorption. The information on the Si status was obtained in MAS NMR experiments. IR studies showed that, even at low exchange degrees, hydroxyl groups both in 10-ring channels and in ferrierite cages were formed. In all the NaKH-ferrierites studied the concentration of Brönsted sites determined in our IR studies was practically identical as the concentration calculated from the zeolite composition. The acid strength of OH groups was found to increase with the H/Na,K exchange degree. The IR experiments of ammonia desorption evidenced that SiOHAl groups in our H-ferrierite were heterogeneous and several kinds of OH groups of various acid strength were found. It is possible that an increase of the acid strength with the exchange degree, i.e. with the amount of protons introduced is realized by the formation of less acidic hydroxyl groups at lower exchange degree, and more acidic hydroxyl groups at higher exchange degrees. pl
dc.subject.en ferrierites pl
dc.subject.en acidity pl
dc.subject.en IR spectroscopy pl
dc.description.volume 243 pl
dc.description.number 2 pl
dc.identifier.doi 10.1016/S0926-860X(02)00548-3 pl
dc.identifier.eissn 1873-3875 pl
dc.title.journal Applied Catalysis. A, General pl
dc.language.container eng pl
dc.affiliation Wydział Chemii : Zakład Chemii Nieorganicznej pl
dc.subtype Article pl


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