| People | Locations | Statistics |
|---|---|---|
| Naji, M. |
| |
| Motta, Antonella |
| |
| Aletan, Dirar |
| |
| Mohamed, Tarek |
| |
| Ertürk, Emre |
| |
| Taccardi, Nicola |
| |
| Kononenko, Denys |
| |
| Petrov, R. H. | Madrid |
|
| Alshaaer, Mazen | Brussels |
|
| Bih, L. |
| |
| Casati, R. |
| |
| Muller, Hermance |
| |
| Kočí, Jan | Prague |
|
| Šuljagić, Marija |
| |
| Kalteremidou, Kalliopi-Artemi | Brussels |
|
| Azam, Siraj |
| |
| Ospanova, Alyiya |
| |
| Blanpain, Bart |
| |
| Ali, M. A. |
| |
| Popa, V. |
| |
| Rančić, M. |
| |
| Ollier, Nadège |
| |
| Azevedo, Nuno Monteiro |
| |
| Landes, Michael |
| |
| Rignanese, Gian-Marco |
|
Jensen, Anker Degn
Technical University of Denmark
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (23/23 displayed)
- 2021Characterization of oxide-supported Cu by infrared measurements on adsorbed COcitations
- 2021Promoting effect of copper loading and mesoporosity on Cu-MOR in the carbonylation of dimethyl ether to methyl acetatecitations
- 2020Structural dynamics of an iron molybdate catalyst under redox cycling conditions studied with in situ multi edge XAS and XRDcitations
- 2019Modeling of the molybdenum loss in iron molybdate catalyst pellets for selective oxidation of methanol to formaldehydecitations
- 2019Catalytic Hydropyrolysis of Biomass using Molybdenum Sulfide Based Catalyst. Effect of Promoterscitations
- 2018Characterization of free radicals by electron spin resonance spectroscopy in biochars from pyrolysis at high heating rates and at high temperaturescitations
- 2018Hydrogen assisted catalytic biomass pyrolysis for green fuels. Effect of cata-lyst in the fluid bed
- 2016Characterization of Free Radicals By Electron Spin Resonance Spectroscopy in Biochars from Pyrolysis at High Heating Rates and at High Temperatures
- 2016Characterization of Free Radicals By Electron Spin Resonance Spectroscopy in Biochars from Pyrolysis at High Heating Rates and at High Temperatures
- 2016Characterization of free radicals by electron spin resonance spectroscopy in biochars from pyrolysis at high heating rates and at high temperaturescitations
- 2016Characterization of free radicals by electron spin resonance spectroscopy in biochars from pyrolysis at high heating rates and at high temperaturescitations
- 2014In situ observation of Cu-Ni alloy nanoparticle formation by X-ray diffraction, X-ray absorption spectroscopy, and transmission electron microscopy: Influence of Cu/Ni ratiocitations
- 2014Electron microscopy study of the deactivation of nickel based catalysts for bio oil hydrodeoxygenation
- 2012Dynamic measurement of mercury adsorption and oxidation on activated carbon in simulated cement kiln flue gascitations
- 2012Catalytic Conversion of Syngas into Higher Alcohols over Carbide Catalystscitations
- 2012CO hydrogenation to methanol on Cu–Ni catalystscitations
- 2012CO hydrogenation to methanol on Cu–Ni catalysts:Theory and experimentcitations
- 2011Alkali resistant Fe-zeolite catalysts for SCR of NO with NH3 in flue gasescitations
- 2011Flame spray synthesis of CoMo/Al2O3 hydrotreating catalystscitations
- 2010Oxy-fuel combustion of solid fuelscitations
- 2009Fluidized-Bed Coating with Sodium Sulfate and PVA-TiO2, 1. Review and Agglomeration Regime Mapscitations
- 2008A review of the interference of carbon containing fly ash with air entrainment in concretecitations
- 2008Top-spray fluid bed coating: Scale-up in terms of relative droplet size and drying forcecitations
Places of action
| Organizations | Location | People |
|---|
article
Characterization of oxide-supported Cu by infrared measurements on adsorbed CO
Abstract
Infrared spectroscopy on CO chemisorbed on Raney Cu and materials with Cu dispersed as nanoparticles on oxide supports was used to evaluate support effects on the Cu surface properties. The C-O frequency (ν C-O ) is sensitive to the charge on the adsorption site with ν C-O being high on Cu + , intermediate on Cu 0 , and low on Cu − , whereby this method can probe the charging state of the Cu surface. The Raney Cu reference demonstrates the complex analysis of the IR band intensity, which can be susceptible to dipole coupling. This means that the most intense IR bands may be higher frequency bands strengthened by such coupling effects rather than the bands arising from the most abundant sites. The ν C-O of the major band attributable to CO adsorbed on the metallic surface follows the order: Cu/SiO 2 > Raney Cu > Cu/Al 2 O 3 > Cu/TiO 2 . Given the charge-frequency relationship these support-dependent frequency shifts are attributed to changes in the charging of the Cu surface caused by support effects. The Cu surface is more electron deficient for Cu/SiO 2 and electron enriched for Cu/TiO 2 . For the Cu/ZnO(/Al 2 O 3 ) samples, which are important as industrial methanol synthesis catalysts, band assignments are complicated by a low ν C-O on Cu + sites connected to the ZnO matrix. However, Cu/ZnO(/Al 2 O 3 ) has a spectral feature at 2065-68 cm −1 , which is a lower frequency than observed in the Cu single crystal studies in the literature and thus indicative of a negative charging of the Cu surface in such systems. Experiments with co-adsorption of CO and electron-withdrawing formate on Cu/ZnO and Cu/SiO 2 show that ν C-O in the adsorbed CO shifts upwards with increasing HCOO coverage. This illustrates that the surface charge is donated to the electron-withdrawing formate adsorbate, and as a result co-adsorbed CO experiences a more charge depleted Cu surface that yields higher ν C-O . The support-dependent surface charging may thus affect the interaction with adsorbates on the metal surface and thereby ...