Water dispersible surface-functionalized platinum/carbon nanorattles for size-selective catalysis

Hofer, Corinne J.; Grass, Robert N.; Schneider, Elia M.; Hendriks, Lyndsey; Herzog, Antoine F.; Zeltner, Martin; Günther, Detlef

doi:10.1039/c7sc03785f

Cited by 14 publications

(16 citation statements)

References 61 publications

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“…It is known that Au, Pd, Ag, Pt or Ni nanoparticles are efficient catalysts for p‐nitrophenol reduction . However, their catalytic activity is highly dependent on particle size and geometry …”

Section: Resultsmentioning

confidence: 99%

“…All chemicals were reactive grade commercial products and were used as received: pentamethyldisiloxane, 1,3-divinyl tetramethyldisiloxane, 4 ] was obtained as described in the literature, [44] i.e. by refluxing RuCl 3 in DMSO.…”

Section: Methodsmentioning

confidence: 99%

“…[49] In addition, according to our measurements, the presence of hydrophobic disiloxane moiety enhanced the affinity of the ligand for Pt(IV), as other studies have revealed for hydrophobic ligands, such as humic acid, which forms stronger complexes with Sb than hydrophilic ligands. [50] For comparison, the complex formation ability of these ligands with PdCl 2 and RuCl 2 (DMSO) 4 was studied using the Hildebrand-Benesi method, and the found stability constants are also summarized in SCHEME 1 Chemical structures of the ligands used in this study Table 1. It can be observed that the affinity for Pd(II) was better in the case of model ligands compared with the siloxane ones, but the para-substituted pyridyl ligands still gave better results in each mini-series.…”

Section: Synthesis Of Pt(iv) Complexesmentioning

confidence: 99%

“…[54] However, their catalytic activity is highly dependent on particle size and geometry. [4,5,54] We attempted to investigate the reduction of C-L1 with NaBH 4 in a separate experiment, following the absorption Figure 13S). Since in our case the absorption maxima of the ligand and complex are very close (266 vs. 270 nm), we suppose that the formation of Pt particles occurs immediately after mixing of the complex with the reduction agent, the released ligand remaining in solution and making the kinetics evaluation difficult.…”

Section: Reduction Of P-nitrophenolmentioning

confidence: 99%

“…[3] The presence of a capping ligand has been found essential for their increased efficiency, since small size particles with high stability are obtained this way. Pt NPs are active catalysts in oxidation of glucose [4] or carbon monoxide [5][6][7] and enhance the photocatalytic efficiency of TiO 2 in hydrogen production. [8] Monodisperse subnanometer Pt clusters of controlled size have been prepared and tested as catalysts in hydrogenation of styrene, [9] while Pt NPs stabilized with polyphenols were found efficient in biphasic hydrogenation of a series of unsaturated compounds.…”

Section: Introductionmentioning

confidence: 99%

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Three Reactions, One Catalyst: A Multi‐Purpose Platinum(IV) Complex and its Silica‐Supported Homologue for Environmentally Friendly Processes

Racleş¹,

Zaltariov²,

Damoc³

et al. 2019

Applied Organom Chemis

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Although platinum nanoparticles and complexes ‐especially of Pt(0) and Pt(II)‐ are well known catalysts, siloxane‐based platinum complexes are rarely reported. Herein, a Platinum(IV) complex of 4‐aminopyridinium‐modified disiloxane was prepared and characterized by medium and far infrared spectroscopy, NMR and EDX. The formation of the complex was monitored by UV–Vis spectroscopy, which showed the high affinity and selectivity of this ligand for Pt, with a stability constant of 7.53·103 M−1. The catalytic activity of the siloxane‐based complex was tested in three types of reactions: reduction of p‐nitrophenol, oxidation of glucose and starch, and hydrosilylation. The hydrophobic behavior of the permethylated disiloxane moiety ensures good hydrolytic stability, while the N‐donor ligand stabilizes the in‐situ formed Pt nanoparticles. The generation of Pt nanoparticles during p‐nitrophenol reduction was confirmed by TEM and SEM. Contrary to most reports, the aerobic oxidation of mono‐ and polysaccharides occurred without oxidation agents or mediators added, in mild conditions, at room temperature and pH ~9. The same metal complex was found active in hydrosilylation of vinyl‐siloxanes with temperature‐modulated rate, thus being useful in silicone cross‐linking systems without the need of inhibitors. The method was adapted to one‐pot synthesis of silica‐supported Pt(IV) complex, which acted as efficient and reusable heterogeneous hydrosilylation catalyst, limiting the contamination of the product with Pt. This approach is promising for superior valorization of scarcely available and expensive platinum metal. By the same method, multifunctional soluble complexes and mesoporous silica may be obtained, with tunable catalytic performance.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Synthesis Of Pt(iv) Complexesmentioning

confidence: 99%

Section: Reduction Of P-nitrophenolmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Three Reactions, One Catalyst: A Multi‐Purpose Platinum(IV) Complex and its Silica‐Supported Homologue for Environmentally Friendly Processes

Racleş¹,

Zaltariov²,

Damoc³

et al. 2019

Applied Organom Chemis

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New heterogeneous catalysts containing platinum group metals recovered from a spent catalytic converter

Racleş¹,

Zaltariov²,

Coroabă³

et al. 2021

Applied Organom Chemis

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A spent catalytic converter was treated with concentrated HCl and hydrogen peroxide in very mild conditions to extract approximately half of its platinum group metals (PGMs) content, mainly as chlorides. The noble metals were subsequently charged into functionalized mesoporous silica by complexation with mercapto groups. A combination of methods was employed to prove the transfer of PGMs and to characterize the materials (inductively coupled plasma optical emission spectrometry [ICP‐OES], Fourier transform‐infrared [FT‐IR] spectroscopy, electrospray ionization mass spectrometry [ESI‐MS], thermogravimetric analysis [TGA], X‐ray photoelectron spectroscopy [XPS], X‐ray diffraction, and UV–Vis spectrophotometry). The resulted PGM‐loaded silica was successfully tested as a new heterogeneous catalyst for hydrosilylation and oxidation reactions. Information about the nature of the PGMs species extracted and loaded completes the existing literature data. The scrap cordierite may be valorized for retention of pollutants from water and also catalyzes the hydrosilylation reaction based on the remaining PGMs. Flexible composite materials can be obtained by incorporating scrap cordierite as filler and crosslinking catalyst into a silicone matrix, significantly enhancing the dielectric permittivity. Thus, complete re‐valorization of the main components of the catalytic converter as high‐added‐value materials was achieved at laboratory level, with very low energy demanding procedures.

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Trendbericht Festkörperchemie

Clemens¹,

Heine²,

Heymann³

et al. 2019

Nachr Chem

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Water dispersible surface-functionalized platinum/carbon nanorattles for size-selective catalysis

Abstract: Surface-functionalized hollow carbon nanobubbles containing platinum in their interior perform size-selective catalysis.

Cited by 14 publications

References 61 publications

Three Reactions, One Catalyst: A Multi‐Purpose Platinum(IV) Complex and its Silica‐Supported Homologue for Environmentally Friendly Processes

Three Reactions, One Catalyst: A Multi‐Purpose Platinum(IV) Complex and its Silica‐Supported Homologue for Environmentally Friendly Processes

New heterogeneous catalysts containing platinum group metals recovered from a spent catalytic converter

Trendbericht Festkörperchemie

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