Olefin hydrogenation on Pd model supported catalysts: New mechanistic insights

Ludwig, Wiebke; Savara, Aditya; Dostert, Karl‐Heinz; Schauermann, Swetlana

doi:10.1016/j.jcat.2011.10.010

Cited by 83 publications

(69 citation statements)

References 33 publications

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“…Shown is the evolution of the reaction rates as a function of time for trans-2-butene-d1 (black curves) and butane-d2 (grey curves). The catalysts were exposed to D2 beam continuously, the cis-2-butene beam was pulsed (from [89] on Pd nanoparticles modified with carbon, it can be concluded that for this system subsurface D can be effectively replenished on the time scale of our kinetic experiments. In further studies on H 2 ?…”

Section: Example #3: Olefin Hydrogenation: Nanoparticles Versus Singlmentioning

confidence: 91%

Models in Catalysis

2014

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The paper discusses the hierarchy of model studies with increasing complexity towards an understanding of industrial catalysts under reaction conditions. We use three case studies to document the progress in systems complexity as well as the development of instruments that allow us to approach the study of acting catalysts: magnesium oxide clusters in the gas phase, gold nanoparticles on metal oxide surfaces, and palladium nanoparticles compared to crystal surfaces. While the examples are from the field of heterogeneous catalysis, we discuss the relation to homogeneous and enzymatic catalysis.

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Section: Example #3: Olefin Hydrogenation: Nanoparticles Versus Singlmentioning

confidence: 91%

Models in Catalysis

2014

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“…This implies that the bimetallic alloys contain some surface Pd which catalyses alkene hydrogenation [70,71]. This might be indicative of the formation of Au(core)-Pd(shell) nanoparticles.…”

Section: Activity Of Titanium Silicates In Selective Oxidation Of Cycmentioning

confidence: 99%

Towards selective catalytic oxidations using in situ generated H2O2

O'Callaghan¹,

Sullivan²

2014

Applied Catalysis B: Environmental

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A series of Ti-modified mesoporous SiO 2 materials (SBA-15 and MCF) are prepared, characterised and used as catalysts in the selective epoxidation of a probe alkene (cyclohexene) using H 2 O 2 as an oxidising agent. Similarly, a series of mesoporous SiO 2 -supported monometallic and bimetallic DMAP-stabilized Au and Pd nanoparticles were prepared, characterised and used as catalysts in the production of H 2 O 2 from dilute H 2 (g) + O 2 (g) mixtures.The metallic nanoparticles were then supported on the Ti-modified mesoporous SiO 2 and these hybrid materials were characterised and their activities in the selective epoxidation of alkenes in the presence of H 2 (g) + O 2 (g) mixtures (where H 2 O 2 would be formed in situ) were studied. The bimetallic Au / Pd nanoparticles (which were most active in the production of H 2 O 2 from H 2 and O 2 )were not the most active or selective in the combined reaction. This was ascribed to the Pd component of the nanoparticles promoting hydrogenation of the probe alkene more rapidly than the formation of H 2 O 2 . The selectivity of Au nanoparticles in the presence of H 2 (g) + O 2 (g) was higher than that of the same catalysts in the presence of H 2 O 2 (aq).

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“…3 However, recent progress in understanding the microscopic details of hydrogenation processes challenges the universality of this belief. In this review, the result is presented on the hydrogenation of cis-2-butene for Pd model nanoparticles supported on iron oxide/Pt(111) oxide thin film and over a Pd(111) single crystal.…”

Section: Hydrogenation Of Alkenesmentioning

confidence: 99%

“…Figure 11.1 shows scanning tunneling microscopy (STM) image of the model Pd catalyst as well as a schematic representation of the structure of the supported Pd-NPs. 3 There is direct experimental evidence that the hydrogenation activity of Pd is strongly dependent on the presence of the hydrogen species absorbed in the subsurface region of the metal catalyst and is governed by the permeability of the surface for hydrogen. The formation of the subsurface hydrogen species in Pd is a strongly structure-sensitive process, and the low-coordinated surface sites such as the corners and edges of the Pd-NPs play a crucial role in the replenishment of the subsurface hydrogen reservoir and maintaining the hydrogenation activity under steady-state conditions.…”

Section: Hydrogenation Of Alkenesmentioning

confidence: 99%