Formation of catalytically active copper and nickel nanoparticles in natural zeolites

Formation of catalytically active copper and nickel nanoparticles in natural zeolites

Bibliografiske detaljer
Parent link:	4th FEZA Conference, Collège de France, Paris, France, september, 2-6, 2008: book of abstracts and recent research reports. PI-C05.— , 2008
Andre forfattere:	Petranovskii V., Pestryakov A. N. Aleksey Nikolaevich, Kazantseva L. K., Cruz J., Kryazhov A. N.
Summary:	Structure, thermostability and catalytic properties of copper and nickel nanoparticles in natural and synthetic zeolites have been studied using methods of XRD, elemental analysis, UV-visible spectroscopy, MAS NMR, TEM and catalytic testing. Different states of Cu have been identified by UV-Vis spectroscopy: Cu+ and Cu2+ ions, O-Cu-O and Cu-O-Cu complexes and Cu nanoparticles. Measurements of synthetic zeolites showed that shape and position of plasma resonance band depend on the acidity of zeolite supports. The most acid mordenites with Si/Al≈7-10 prevents formation of copper nanoparticles while Cu2+ is reduced to Cu+ and few atomic Cun clusters. Less acid erionite, clinoptilolite and mordenites with high Si/Al ratio promote formation of Cu nanoparticles. For Ni-exchanged zeolites spectra typical for Ni(H2O)62+ are observed. The spectra changed with increasing temperature due to dehydration of Ni2+ coordination sphere and replacement of H2O ligand molecules by oxygen atoms of zeolite framework. The catalytic experiments demonstrate that the temperature of beginning of hydrocarbons conversion starts in 170-250°C range, depending on the composition of the catalyst. The complete conversion can be observed for all zeolites, depending (probably) on Si/Al ratio of the zeolite matrix. No destruction of crystalline structure was observed from XRD and 27Al MAS NMR spectra under conditions used for catalytic tests. В фонде НТБ ТПУ отсутствует
Udgivet:	2008
Fag:	труды учёных ТПУ
Format:	Book Chapter
KOHA link:	https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=599112

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