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An IR spectroscopy study of Co sites in zeolites CoZSM-5


An IR spectroscopy study of Co sites in zeolites CoZSM-5

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dc.contributor.author Góra-Marek, Kinga [SAP11018751] pl
dc.contributor.author Gil, Barbara [SAP11016267] pl
dc.contributor.author Śliwa, Michał pl
dc.contributor.author Datka, Jerzy [SAP11003748] pl
dc.date.accessioned 2015-09-24T07:45:09Z
dc.date.available 2015-09-24T07:45:09Z
dc.date.issued 2007 pl
dc.identifier.issn 0926-860X pl
dc.identifier.uri http://ruj.uj.edu.pl/xmlui/handle/item/15778
dc.language eng pl
dc.title An IR spectroscopy study of Co sites in zeolites CoZSM-5 pl
dc.type JournalArticle pl
dc.description.physical 33-42 pl
dc.abstract.en We examined the status and properties of Co2+ and Co3+ in CoZSM-5 zeolites of various Si/Al and Co contents and activated under various conditions. CO, NO and pivalonitrile were used as probe molecules. Some information on the status of Co was also obtained by comparing the intensities of Si–OH–Al bands and the concentration of protonic sites measured with pyridine. IR studies showed that in zeolite with high concentrations of AlO4− (of low Si/Al) practically all Co takes the form of Co2+ exchange cations (CO band at 2204 cm−1). However, in zeolites with low AlO4− concentrations (of high Si/Al) most Co occurs in the form of CoO (CO band at 2179 cm−1) or “oxide-like clusters” (bands at 2184 and 2194 cm−1, respectively). Experiments with co-adsorption of pivalonitrile and CO prove that all cobalt species (both in exchange positions and in “oxide-like clusters”) are situated inside zeolitic channels. The spectra of NO revealed the presence of three kinds of Co3+ (NO bands 1940, 1955 and 1970 cm−1), presence of Co2+ mononitrosyls (NO band at 1850 cm−1) and of Co2+ dinitrosyls (NO bands at 1815 and 1895 cm−1). Experiments on the co-adsorption of NO and CO suggested that NO can be bonded to Co2+ in exchange cationic positions, in “oxide-like clusters” (characterized by CO bands at 2204 and 2194 cm−1), but it cannot interact with Co2+ in “oxide-like clusters” (CO band at 2184 cm−1) or bulk CoO (CO band at 2179 cm−1). pl
dc.subject.en zeolite CoZSM-5 pl
dc.subject.en IR spectroscopy pl
dc.subject.en nitrosyls pl
dc.description.volume 330 pl
dc.identifier.doi 10.1016/j.apcata.2007.06.033 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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