Ethylene adsorption on thin films of Ni, Pd, Pt, Cu, Au and Al; Work function measurements

Franken, P.E.C.; Ponec, V.

doi:10.1016/0039-6028(75)90134-x

Cited by 48 publications

(7 citation statements)

References 26 publications

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“…Obviously, unpromoted metallic surfaces like Cu 0 are highly suitable for the hydrogenation of unsaturated hydrocarbons. It is known from literature that Cu 0 can act as adsorption site for ethylene 34 , and Cu-based catalysts are also applied in other hydrogenation reactions such as the hydrogenation of esters 35 . Furthermore, the high hydrogen content in the syngas is sufficient to ensure that ethylene hydrogenation can proceed without disturbing the formation of methanol on the Cu–Zn interface sites.…”

Section: Resultsmentioning

confidence: 99%

Identifying the nature of the active sites in methanol synthesis over Cu/ZnO/Al2O3 catalysts

2020

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The heterogeneously catalysed reaction of hydrogen with carbon monoxide and carbon dioxide (syngas) to methanol is nearly 100 years old, and the standard methanol catalyst Cu/ ZnO/Al 2 O 3 has been applied for more than 50 years. Still, the nature of the Zn species on the metallic Cu 0 particles (interface sites) is heavily debated. Here, we show that these Zn species are not metallic, but have a positively charged nature under industrial methanol synthesis conditions. Our kinetic results are based on a self-built high-pressure pulse unit, which allows us to inject selective reversible poisons into the syngas feed passing through a fixed-bed reactor containing an industrial Cu/ZnO/Al 2 O 3 catalyst under high-pressure conditions. This method allows us to perform surface-sensitive operando investigations as a function of the reaction conditions, demonstrating that the rate of methanol formation is only decreased in CO 2-containing syngas mixtures when pulsing NH 3 or methylamines as basic probe molecules.

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Section: Resultsmentioning

confidence: 99%

Identifying the nature of the active sites in methanol synthesis over Cu/ZnO/Al2O3 catalysts

2020

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“…Under high surface coverage, there is a strong repulsive interaction between the adsorbates, weakening the metal-C and metal-H bonds, allowing facile insertion of H into the metal-C bond, thus lowering the activation barrier. Weakening the metal-adsorbate bond strength will further lower the intrinsic activation barrier for hydrogenation . The hydrocarbon species layer on a Pt surface can be hydrogenated and removed most easily , compared to other metals .…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Catalytic Porous Metallic Nanorods by Galvanic Exchange Reaction

et al. 2009

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We demonstrate a simple method for the synthesis of nanoporous metal (Au, Pt, and Pd) rods by the galvanic exchange reaction using Ni as a sacrificial template. Nickel nanorods, prepared by electrodeposition inside porous alumina membrane, were converted to various nanoporous metallic structures by dispersing them in metal salt solutions of the respective metals that are galvanically exchanged. The catalytic activity of the porous Pt and Pd nanorods in the hydrogenation of ethylene was comparable to supported Pt and Pd nanoparticles. The porous nanorods provide a new form of unsupported catalysts in contrast to traditional supported nanoparticle catalysts and can be synthesized in uniform sizes and separated easily from the reaction mixtures without aggregation.

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“…Details of the experimental procedure and set-up are described elsewhere [10,11]. Gold has been used as reference electrode, as hydrocarbons are adsorbed on it only physically [7,17], and this does not play any role above room temperature.…”

Section: Methodsmentioning

confidence: 99%

Adsorption of methane and ethane, 1. Studies of work function changes of Pt foil. Effect of pressure

Hlavathy

Tétényi

1997

React Kinet Catal Lett

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Ethylene adsorption on thin films of Ni, Pd, Pt, Cu, Au and Al; Work function measurements

Cited by 48 publications

References 26 publications

Identifying the nature of the active sites in methanol synthesis over Cu/ZnO/Al2O3 catalysts

Identifying the nature of the active sites in methanol synthesis over Cu/ZnO/Al2O3 catalysts

Synthesis of Catalytic Porous Metallic Nanorods by Galvanic Exchange Reaction

Adsorption of methane and ethane, 1. Studies of work function changes of Pt foil. Effect of pressure

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