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Tetraalkylammonium Salts of Platinum Nitrato Complexes: Isolation, Structure, and Relevance to the Preparation of PtOx/CeO2 Catalysts for Low-Temperature CO Oxidation
journal contribution
posted on 2019-04-05, 18:04 authored by Danila Vasilchenko, Polina Topchiyan, Semen Berdyugin, Evgeny Filatov, Sergey Tkachev, Iraida Baidina, Vladislav Komarov, Elena Slavinskaya, Andrey Stadnichenko, Evgeny GerasimovA series of tetraalkylammonium salts
with anionic platinum nitrato complexes (Me4N)2[Pt2(μ-OH)2(NO3)8] (1), (Et4N)2[Pt2(μ-OH)2(NO3)8] (2), (n-Pr4N)2[Pt2(μ-OH)2(NO3)8] (3b), (n-Pr4N)2[Pt(NO3)6] (3a), and (n-Bu4N)2[Pt(NO3)6]
(4) were isolated from nitric acid solutions of [Pt(H2O)2(OH)4] in high yield. The structures
of salts 2, 3a, 3b, and 4, prepared for the first time, were characterized by X-ray
diffraction. The sorption of [Pt(NO3)6]2– and [Pt2(μ-OH)2(NO3)8]2– complexes
onto the ceria surface from acetone solutions of salts 4 and 1 was examined. The dimeric anion was shown to
quickly and irreversibly chemisorb onto the CeO2 carrier,
selectively transforming into Pt(II) centers after thermal treatment,
becoming active in the low-temperature CO oxidation reaction (T50% = 110 °C at a space velocity of 240 000
h–1). By contrast, the homoleptic complex [Pt(NO3)6]2– did not interact with the
ceria, which may be attributed to the substitutional inertness of
the [Pt(NO3)6]2– anion.
We believe that the strategy based on the sorption of polynuclear
platinum nitrato complexes is an effective route to prepare ionic
platinum species uniformly distributed on an oxide carrier for various
catalytic applications.
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polynuclear platinum nitrato complexesPlatinum Nitrato ComplexesLow-Temperature CO OxidationBu 4 Nplatinum speciesCeO 2 carrierOH4 NPtX-ray diffractionacetone solutionssubstitutional inertnessTetraalkylammonium Saltsplatinum nitrato complexesCO oxidation reactionPr 4 Nspace velocity3 bsalts 4salts 2ceria surfaceEt 4 Nnitric acid solutionstetraalkylammonium saltsdimeric anion240 000oxide carrier
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