Ligand‐Free Platinum Nanoparticles Encapsulated in a Hollow Porous Carbon Shell as a Highly Active Heterogeneous Hydrogenation Catalyst

Ikeda, Shigeru; Ishino, Satoru; Harada, Takashi; Okamoto, Natsumi; Sakata, Takao; Mori, Hirotarô; Kuwabata, Susumu; Torimoto, Tsukasa; Matsumura, Michio

doi:10.1002/ange.200602700

Cited by 129 publications

(54 citation statements)

References 42 publications

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“…In a different approach, Ikeda et al [60] covered PVP-protected Pt nanoparticles with a double shell of silica and mesoporous silica. After calcination at 550 8C, silica-encapsulated Pt nanoparticles were obtained.…”

Section: Platinummentioning

confidence: 99%

Embedded Phases: A Way to Active and Stable Catalysts

et al. 2010

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Industrial catalysts are typically made of nanosized metal particles, carried by a solid support. The extremely small size of the particles maximizes the surface area exposed to the reactant, leading to higher reactivity. Moreover, the higher the number of metal atoms in contact with the support, the better the catalyst performance. In addition, peculiar properties have been observed for some metal/metal oxide particles of critical sizes. However, thermal stability of these nanostructures is limited by their size; smaller the particle size, the lower the thermal stability. The ability to fabricate and control the structure of nanoparticles allows to influence the resulting properties and, ultimately, to design stable catalysts with the desired characteristics. Tuning particle sizes provides the possibility to modulate the catalytic activity. Unique and unexpected properties have been observed by confining/embedding metal nanoparticles in inorganic channels or cavities, which indeed offers new opportunities for the design of advanced catalytic sytems. Innovation in catalyst design is a powerful tool in realizing the goals of more green, efficient and sustainable industrial processes. The present Review focuses on the catalytic performance of noble metal‐ and non precious metal‐based embedded catalysts with respect to traditional impregnated systems. Emphasis is dedicated to the improved thermal stability of these nanostructures compared to conventional systems.

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Section: Platinummentioning

confidence: 99%

Embedded Phases: A Way to Active and Stable Catalysts

et al. 2010

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“…Interesting applications of supported nanoparticles lie in the field of heterogeneous catalysis, including hydrogenation, [56][57][58][59][60][61] CÀC coupling [62][63][64][65][66][67][68][69] or oxidation reactions. [70][71][72][73][74][75] The selective oxidation of alcohols yielding aldehydes and ketones is a highly important reaction and the developments of recent years tend to "green" chemistry reactions employing dioxygen or even air as an oxidant accompanied by mild reaction conditions (solvent-free, base-free).…”

Section: Introductionmentioning

confidence: 99%

Pt@MOF‐177: Synthesis, Room‐Temperature Hydrogen Storage and Oxidation Catalysis

Proch

Herrmannsdörfer

Kempe

et al. 2008

Chemistry A European J

283

176

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The gas-phase loading of [Zn(4)O(btb)(2)](8) (MOF-177; H(3)btb=1,3,5-benzenetribenzoic acid) with the volatile platinum precursor [Me(3)PtCp'] (Cp'=methylcyclopentadienyl) was confirmed by solid state (13)C magic angle spinning (MAS)-NMR spectroscopy. Subsequent reduction of the inclusion compound [Me(3)PtCp'](4)@MOF-177 by hydrogen at 100 bar and 100 degrees C for 24 h was carried out and gave rise to the formation of platinum nanoparticles in a size regime of 2-5 nm embedded in the unchanged MOF-177 host lattice as confirmed by transmission electron microscopy (TEM) micrographs and powder X-ray diffraction (PXRD). The room-temperature hydrogen adsorption of Pt@MOF-177 has been followed in a gravimetric fashion (magnetic suspension balance) and shows almost 2.5 wt % in the first cycle, but is decreased down to 0.5 wt % in consecutive cycles. The catalytic activity of Pt@MOF-177 towards the solvent- and base-free room temperature oxidation of alcohols in air has been tested and shows Pt@MOF-177 to be an efficient catalyst in the oxidation of alcohols.

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“…14,17,18 These solely electrostatically stabilized NPs are free of organic stabilizers or ligands and therefore herein called "naked". Such "naked" NPs can be used directly for catalytic applications, both in aqueous solution and for solid supports.…”

Section: Introductionmentioning

confidence: 99%

Reliable palladium nanoparticle syntheses in aqueous solution: the importance of understanding precursor chemistry and growth mechanism

et al. 2015

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Reliable protocols for the synthesis of palladium nanoparticles (Pd-NPs) in aqueous solution are rarely found and the corresponding growth mechanisms often remain unknown. Furthermore, syntheses of Pd-NPs always demand the use of stabilizing agents which are often unfavorable for catalytic applications. In this contribution, the importance of the palladium precursor chemistry as a prerequisite for any reliable Pd-NP synthesis in aqueous solution is shown. This includes a detailed study of the influence of the precursor chemistry on the nanoparticle growth mechanism. The findings enable the controlled modification of a common synthetic protocol (i.e. the reduction of a palladium precursor with NaBH4) to obtain sub-5 nm Pd-NPs without the use of any stabilizing agent. In addition, it is also shown that such mechanistic studies are not only of great importance to the development of novel synthetic procedures. Exemplarily, the successful transfer of the synthesis from lab-to large-scale is demonstrated.BMBF, 03EK3009, Design hocheffizienter Elektrolysekatalysatore

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Ligand‐Free Platinum Nanoparticles Encapsulated in a Hollow Porous Carbon Shell as a Highly Active Heterogeneous Hydrogenation Catalyst

Cited by 129 publications

References 42 publications

Embedded Phases: A Way to Active and Stable Catalysts

Embedded Phases: A Way to Active and Stable Catalysts

Pt@MOF‐177: Synthesis, Room‐Temperature Hydrogen Storage and Oxidation Catalysis

Reliable palladium nanoparticle syntheses in aqueous solution: the importance of understanding precursor chemistry and growth mechanism

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