Catalysts based on platinum–tin and platinum–gallium in close contact for the selective hydrogenation of cinnamaldehyde

Plomp, Arie J.; Asten, D.M.P. van; Eerden, Ad M. J. van der; Mäki‐Arvela, Päivi; Murzin, Dmitry Yu.; Jong, Krijn P. de; Bitter, Johannes H.

doi:10.1016/j.jcat.2009.02.003

Cited by 48 publications

(30 citation statements)

References 24 publications

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“…10 Alternatively, TMO x nanopatches can be deposited on Pt NPs via a reductive deposition precipitation (RDP) process. 32 The deposited TM cations stay exclusively on the surface of Pt NPs, as confirmed by acid leaching together with inductively coupled , respectively. γ oxide is the surface energy of oxide, γ metal is the surface energy of metal, γ interface is the interface free energy, and θ is the contact angle.…”

Section: Oxide-on-metal Inverse Catalystsmentioning

confidence: 83%

Interface-Confined Oxide Nanostructures for Catalytic Oxidation Reactions

2013

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H eterogeneous catalysts, often consisting of metal nanoparticles supported on high-surface-area oxide solids, are common in industrial chemical reactions. Researchers have increasingly recognized the importance of oxides in heterogeneous catalysts: that they are not just a support to help the dispersion of supported metal nanoparticles, but rather interact with supported metal nanoparticles and affect the catalysis. The critical role of oxides in catalytic reactions can become very prominent when oxides cover metal surfaces forming the inverse catalysts.The source of the catalytic activity in homogeneous catalysts and metalloenzymes is often coordinatively unsaturated (CUS) transition metal (TM) cations, which can undergo facile electron transfer and promote catalytic reactions. Organic ligands and proteins confine these CUS cations, making them highly active and stable. In heterogeneous catalysis, however, confining these highly active CUS centers on an inorganic solid so that they are robust enough to endure the reaction environment while staying flexible enough to perform their catalysis remains a challenge.In this Account, we describe a strategy to confine the active CUS centers on the solid surface at the interface between a TM oxide (TMO) and a noble metal (NM). Among metals, NMs have high electron negativity and low oxygen affinity. This means that TM cations of the oxide bind strongly to NM atoms at the interface, forming oxygen-terminated-bilayer TMO nanostructures. The resulting CUS sites at the edges of the TMO nanostructure are highly active for catalytic oxidation reactions. Meanwhile, the strong interactions between TMOs and NMs prevent further oxidation of the bilayer TMO phases, which would otherwise result in the saturation of oxygen coordination and the deactivation of the CUS cations. We report that we can also tune the oxideÀmetal interactions to modulate the bonding of reactants with CUS centers, optimizing their catalytic performance.We review our recent progress on oxide-on-metal inverse catalysts, mainly the TMO-on-Pt (TM = Fe, Co, and Ni) systems and discuss the interface-confinement effect, an important factor in the behavior of these catalytic systems. We have studied both model catalyst systems and real supported nanocatalysts. Surface science studies and density functional theory calculations in model systems illustrate the importance of the oxideÀmetal interfaces in the creation and stabilization of surface active centers, and reveal the reaction mechanism at these active sites. In real catalysts, we describe facile preparation processes for fabricating the oxide-on-metal nanostructures. We have demonstrated excellent performance of the inverse catalysts in oxidation reactions such as CO oxidation. We believe that the interface confinement effect can be employed to design highly efficient novel catalysts and that the inverse oxide-on-metal catalysts may find wide applications in heterogeneous catalysis.

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Section: Oxide-on-metal Inverse Catalystsmentioning

confidence: 83%

Interface-Confined Oxide Nanostructures for Catalytic Oxidation Reactions

2013

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“…The Meerwein-Pondorf-Verley reaction applied to these aldehydes in homogeneous catalysis allows to selectively obtain the unsaturated alcohol with a high conversion but a large amount of waste: This methodology is therefore prescribed for costly chemicals [2,6,7]. The development of heterogeneous catalysts on various supports, environmentally friendlier and able to selectively hydrogenate both functions separately was thus considered as a valuable option by many authors [1][2][3]5,[8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…conducted on metals deposited on carbon supports revealed that Pt and Ru, because of their acceptable activity, selectivity and stability, feature among the best considered metals to obtain the desired unsaturated alcohol [21]. In addition, a combination of several metals can greatly improve the selectivity toward the desired product [12,18,20,22,23]: PtARu bimetallic catalysts gave impressive activity and selectivity [1,[24][25][26][27]. This activity/selectivity enhancement is a result of synergism effect [28] which can be explained mainly by electronic and geometric effects: The former is due to an alloy formation or intimate contacts between metals [29] while the latter comes from effects such as a modification of the metal dispersion [30,31] or a surface enrichment [32][33][34].…”

Section: Introductionmentioning

confidence: 99%

“…Oxides, such as silica and alumina, and carbon based supports including activated carbon, carbon nanofibers, carbon nanotubes (CNTs) and recently graphene oxide/reduced graphene oxide (GO/rGO) are the most commonly used supports [1][2][3]5,[8][9][10][11][12][13][14][15][16][17]43]. Among them, nanocarbons (CNTs, GO, rGO) have been selected for this work.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Covalently and non-covalently immobilized clusters onto nanocarbons as catalysts precursors for cinnamaldehyde selective hydrogenation

Vriamont

Haynes

McCague-Murphy

et al. 2015

Journal of Catalysis

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“…Moreover, these polar surface oxygen groups remarkably influence the catalytic activity and selectivity by tuning the preferential reactant adsorption and product desorption. The surface oxygen effect has been extensively investigated in the selective hydrogenation of cinnamaldehyde [22][23][24]. The C=O bond of cinnamaldehyde favors interacting with the oxygen groups on support surfaces instead of the metal active sites, resulting in the poor activity and selectivity.…”

Section: Introductionmentioning

confidence: 99%

Aerobic Oxidation of Benzyl Alcohol over Activated Carbon Supported Manganese and Vanadium Catalysts: Effect of Surface Oxygen-Containing Groups

Chen

Tang

et al. 2010

Catal Lett

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In this contribution, the selective oxidation of benzyl alcohol using molecular oxygen over supported manganese and vanadium catalysts was investigated. The catalytic activities were significantly improved after preoxidizing the activated carbon support materials. Characterizations of nitrogen physisorption, X-ray diffraction, transmission electron microscopy, and X-ray absorption were involved to examine the physicochemical properties of as-prepared catalysts. By ruling out the effects of specific surface area, active site dispersion, valence and local coordination of Mn and V active species, the improved catalytic activity was attributed to the specific variety and increased density of oxygen-containing groups on activated carbon support surfaces, which was further confirmed by cyclic voltammetry measurements and Fourier transform infrared spectroscopy.

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Catalysts based on platinum–tin and platinum–gallium in close contact for the selective hydrogenation of cinnamaldehyde

Cited by 48 publications

References 24 publications

Interface-Confined Oxide Nanostructures for Catalytic Oxidation Reactions

Interface-Confined Oxide Nanostructures for Catalytic Oxidation Reactions

Covalently and non-covalently immobilized clusters onto nanocarbons as catalysts precursors for cinnamaldehyde selective hydrogenation

Aerobic Oxidation of Benzyl Alcohol over Activated Carbon Supported Manganese and Vanadium Catalysts: Effect of Surface Oxygen-Containing Groups

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