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Selective catalytic oxidation of ammonia to nitrogen over Mg-Al, Cu-Mg-Al and Fe-Mg-Al mixed metal oxides doped with noble metals

Selective catalytic oxidation of ammonia to nitrogen ...

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dc.contributor.author Chmielarz, Lucjan [SAP11016389] pl
dc.contributor.author Jabłońska, Magdalena [USOS36195] pl
dc.contributor.author Strumiński, Adam pl
dc.contributor.author Piwowarska, Zofia [SAP12011975] pl
dc.contributor.author Węgrzyn, Agnieszka [SAP11017155] pl
dc.contributor.author Witkowski, Stefan [SAP11012780] pl
dc.contributor.author Michalik, Marek [SAP11008585] pl
dc.date.accessioned 2015-06-10T10:04:15Z
dc.date.available 2015-06-10T10:04:15Z
dc.date.issued 2013 pl
dc.identifier.issn 0926-3373 pl
dc.identifier.uri http://ruj.uj.edu.pl/xmlui/handle/item/9213
dc.language eng pl
dc.rights Dodaję tylko opis bibliograficzny *
dc.rights.uri *
dc.title Selective catalytic oxidation of ammonia to nitrogen over Mg-Al, Cu-Mg-Al and Fe-Mg-Al mixed metal oxides doped with noble metals pl
dc.type JournalArticle pl
dc.description.physical 152-162 pl
dc.abstract.en Mg-Al, Cu-Mg-Al and Fe-Mg-Al mixed oxides, were obtained by thermal decomposition of synthetic hydrotalcite-like materials and, in the next step, were modified with selected noble metals (Pt, Pd, Rh) by incipient wetness impregnation method. The process of thermal decomposition of hydrotalcite-like materials into metal oxide systems was studied by thermogravimetry method combined with the on-line analysis of gaseous products of the sample decomposition (TG–DTA-QMS). The obtained catalysts were studied with respect to chemical composition (EDS), structure (XRD, UV–vis–DRS), morphology (STEM), surface area (BET) and redox properties (H2-TPR). Metal oxide catalysts obtained from the hydrotalcite-like precursors were characterized by high dispersion of transition metals (Cu, Fe), which were present mainly in the form of monomeric or small aggregated species dispersed in the Mg-Al oxide matrix. Noble metals, as it was shown by STEM studies, were rather uniformly dispersed on the surface of the samples. The obtained samples were tested as catalysts of the selective catalytic oxidation (SCO) of ammonia to nitrogen. The Cu-Mg-Al oxide catalyst was active in the low-temperature SCO process, while the Fe-containing sample was found to operate in the high temperature range. Modification of these catalysts with noble metals significantly decreased temperature of the ammonia oxidation but also decreased the selectivity to nitrogen. The best catalytic properties were obtained for the Cu-Mg-Al oxide catalyst modified with small amount of platinum (0.2 wt%), which operated at relatively low temperature with high selectivity to nitrogen. pl
dc.subject.en selective catalytic oxidation (SCO) of ammonia pl
dc.subject.en hydrotalcite-like materials pl
dc.subject.en mixed metal oxides pl
dc.subject.en noble metals pl
dc.description.volume 130-131 pl
dc.identifier.doi 10.1016/j.apcatb.2012.11.004 pl
dc.identifier.eissn 1873-3883 pl
dc.title.journal Applied Catalysis. B, Environmental pl
dc.language.container eng pl
dc.affiliation Wydział Biologii i Nauk o Ziemi : Instytut Nauk Geologicznych pl
dc.affiliation Wydział Chemii : Zakład Chemii Nieorganicznej pl
dc.affiliation Wydział Chemii : Zakład Technologii Chemicznej pl
dc.subtype Article pl
dc.rights.original bez licencji pl
dc.pbn.affiliation USOS36195:UJ.WCh; pl
.pointsMNiSW [2013 A]: 45


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