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Your search keyword '"Porsgaard, Soeren"' showing total 21 results
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21 results on '"Porsgaard, Soeren"'

4. Room-temperature reaction of oxygen with gold: an in situ ambient-pressure X-ray spectroscopy investigation

Author

Peng Jiang, Porsgaard, Soeren, Borondics, Ferenc, Kober, Mariana, Caballero, Alfonso, Bluhm, Hendrik, Besenbacher, Flemming, and Salmeron, Miquel

Subjects
Gold -- Chemical properties, Gold -- Thermal properties, Oxidation-reduction reaction -- Analysis, Titanium dioxide -- Chemical properties, Titanium dioxide -- Thermal properties, X-ray spectroscopy -- Usage, Chemistry
Abstract

In situ ambient pressure X-ray photoelectron spectroscopy is used for studying the interaction of [O.sub.2] with gold foil and gold nanoparticles grown by thermal deposition on Ti[O.sub.2](110). X-ray irradiation is very effective in promoting gold oxidation on both surfaces in the presence of [O.sub.2].

Published
2010

5. Unravelling Site-Specific Photo-Reactions of Ethanol on Rutile TiO2(110)

Author

Hansen, Jonas Ø., primary, Bebensee, Regine, additional, Martinez, Umberto, additional, Porsgaard, Soeren, additional, Lira, Estephania, additional, Wei, Yinying, additional, Lammich, Lutz, additional, Li, Zheshen, additional, Idriss, Hicham, additional, Besenbacher, Flemming, additional, Hammer, Bjørk, additional, and Wendt, Stefan, additional

Published
2016
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6. Room-temperature reaction of oxygen with gold: An in situ ambient-pressure x-ray photoelectron spectroscopy investigation

Author

Universidad de Sevilla. Departamento de Química Inorgánica, Department of Energy. United States, Jiang, Peng, Porsgaard, Soeren, Borondics, Ferenc, Kober, Mariana, Caballero Martínez, Alfonso, Bluhm, Hendrik, Besenbacher, Flemming, Salmeron, Miquel, Universidad de Sevilla. Departamento de Química Inorgánica, Department of Energy. United States, Jiang, Peng, Porsgaard, Soeren, Borondics, Ferenc, Kober, Mariana, Caballero Martínez, Alfonso, Bluhm, Hendrik, Besenbacher, Flemming, and Salmeron, Miquel

Abstract

(Figure Presented) The interaction of O2 with gold foil and gold nanoparticles grown by thermal deposition on TiO2(110) was studied by in situ ambient pressure X-ray photoelectron spectroscopy at room temperature. No spontaneous dissociation of O2 was observed either on Au foil or on Au nanoparticles up to 1 Torr of O2. X-ray irradiation, however, is very effective in promoting gold oxidation on both surfaces in the presence of O2. Our results help reconcile recent conflicting experimental observations regarding the activation of molecular oxygen, which is a crucial issue in Au catalyzed oxidation reactions.

Published
2010

7. In Situ Study of CO Oxidation on HOPG‐Supported Pt Nanoparticles

Author

Porsgaard, Soeren, primary, Ono, Luis K., additional, Zeuthen, Helene, additional, Knudsen, Jan, additional, Schnadt, Joachim, additional, Merte, Lindsay R., additional, Chevallier, Jacques, additional, Helveg, Stig, additional, Salmeron, Miquel, additional, Wendt, Stefan, additional, and Besenbacher, Flemming, additional

Published
2013
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8. Experimental and theoretical investigation of the electronic structure of Cu2O and CuO thin films on Cu(110) using x-ray photoelectron and absorption spectroscopy

Author

Jiang, Peng, primary, Prendergast, David, additional, Borondics, Ferenc, additional, Porsgaard, Soeren, additional, Giovanetti, Lisandro, additional, Pach, Elzbieta, additional, Newberg, John, additional, Bluhm, Hendrik, additional, Besenbacher, Flemming, additional, and Salmeron, Miquel, additional

Published
2013
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11. Stabilization Principles for Polar Surfaces of ZnO

Author

Lauritsen, Jeppe V., primary, Porsgaard, Soeren, additional, Rasmussen, Morten K., additional, Jensen, Mona C. R., additional, Bechstein, Ralf, additional, Meinander, Kristoffer, additional, Clausen, Bjerne S., additional, Helveg, Stig, additional, Wahl, Roman, additional, Kresse, Georg, additional, and Besenbacher, Flemming, additional

Published
2011
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16. Reduction of FeO/Pt(111) thin films by exposure to atomic hydrogen

Author

Knudsen, Jan, primary, Merte, Lindsay R., additional, Grabow, Lars C., additional, Eichhorn, Falk M., additional, Porsgaard, Soeren, additional, Zeuthen, Helene, additional, Vang, Ronnie T., additional, Lægsgaard, Erik, additional, Mavrikakis, Manos, additional, and Besenbacher, Flemming, additional

Published
2010
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18. Room-Temperature Reaction of Oxygen with Gold: An In situ Ambient-Pressure X-ray Photoelectron Spectroscopy Investigation.

Author

Peng Jiang, Porsgaard, Soeren, Borondics, Ferenc, Käber, Mariana, Caballero, Alfonso, Bluhm, Hendrik, Besenbacher, Flemming, and Salmeron, Miquel

Subjects
*X-ray photoelectron spectroscopy, *OXYGEN, *GOLD, *X-rays, *SPECTRUM analysis
Abstract

The article focuses on the use of in situ ambient-pressure x-ray photoelectron spectroscopy in investigating the reaction of room-temperature oxygen (O2) with gold (Au). According to the gathered data from the observation, there was no strong interaction between molecular oxygen and Au surfaces at room temperature. It also mentions the critical role played by x-rays during in situ measurements.

Published
2010
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20. Effects of the crystal reduction state on the interaction of oxygen with rutile TiO2(110)

Author

Lira, Estephania, Huo, Peipei, Hansen, Jonas Ø., Rieboldt, Felix, Bechstein, Ralf, Wei, Yinying, Streber, Regine, Porsgaard, Soeren, Li, Zheshen, Lægsgaard, Erik, Wendt, Stefan, and Besenbacher, Flemming

Subjects
*CHEMICAL reduction, *OXYGEN, *RUTILE, *TITANIUM dioxide, *TEMPERATURE effect, *SCANNING tunneling microscopy, *DESORPTION, *DISSOCIATION (Chemistry)
Abstract

Abstract: The interaction of O2 with reduced rutile TiO2(110)–(1×1) has been studied by means of scanning tunneling microscopy (STM), temperature-programmed desorption (TPD) and photoelectron spectroscopy (PES). It is found that the interaction of O2 with TiO2(110) depends strongly on the reduction state of the TiO2(110) crystal. High-resolution STM studies revealed that the energy barrier for the non-vacancy-assisted, 2nd O2 dissociation channel decreases with increasing crystal reduction. Additionally, it is found in the STM studies that the Ti interstitial diffusion is slightly more facile in high-reduced TiO2(110) crystals compared to low-reduced ones. Accompanying TPD studies revealed that the line shape of the O2-TPD peak occurring between ∼360K and ∼450K depends on the crystal reduction state. For high-reduced TiO2(110) crystals characterized by large terraces most O2 molecules desorb at ∼386K, whereas O2 desorption is peaking at ∼410K for low- and medium-reduced crystals. Furthermore, the O2-TPD experiments revealed a highly non-linear behavior of the O2 desorption peak integrals as function of the crystal reduction state. The presented results point to an ionosorption model where the adsorbates withdraw the excess charge (Ti3+) from the near-surface region at temperatures<∼360K and where Ti interstitials react with oxygen species on the surface at temperatures≥∼360K. [Copyright &y& Elsevier]

Published
2012
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