Quantitative solid-state NMR investigation of V5+ species in VPO catalysts upon sequential selective oxidation of n-butane

Autor:	Thomas Schölkopf, Jörg Frey, Elias Klemm, Christian Lieder, Thomas Schleid, Ulrich Nieken, Michael Hunger
Rok vydání:	2010
Předmět:	Inorganic chemistry Maleic anhydride chemistry.chemical_element Butane Nuclear magnetic resonance spectroscopy Nitrogen Catalysis chemistry.chemical_compound Adsorption chemistry Solid-state nuclear magnetic resonance Physical and Theoretical Chemistry Mesoporous material
Zdroj:	Journal of Catalysis. 272:131-139
ISSN:	0021-9517
DOI:	10.1016/j.jcat.2010.03.004
Popis:	Bulk VPO catalysts (VPO/bulk) and VPO catalysts supported on mesoporous SBA-15 material (VPO/SBA-15) were treated sequentially in a flow of nitrogen loaded with n -butane and of synthetic air loaded with n -butane in order to reach a complete reduction and reoxidation, respectively, of the catalyst surface. The V 5+ species on these VPO catalysts were quantitatively investigated by solid-state NMR spectroscopy and correlated with the catalytic activities of the corresponding materials in the selective oxidation of n -butane to maleic anhydride. By 31 P{ 1 H} cross-polarization MAS NMR experiments on the n -butane-loaded VPO/SBA-15 catalyst was evidenced that n -butane is preferentially adsorbed at surface sites of δ -VOPO 4 -like phases. Based on the number of P/V 5+ species in δ -VOPO 4 -like phases as determined by MAS NMR spectroscopy, the turnover frequency of the surface sites on the VPO/SBA-15 catalyst was estimated to be about 0.2 s −1 .
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::6736ee4686a54e18b534743e12b9dc19 https://doi.org/10.1016/j.jcat.2010.03.004 Zobrazit plný text záznamu Full Text from ScienceDirect