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Applied Catalysis and Spectroscopy

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Datum
28 septembre 2021
Aging of DOC

Aging of Diesel oxidation catalysts

Diesel oxidation catalysts mitigate toxic emissions in heavy duty vehicles but they age during operation due to deposition of chemical elements and structural changes in the active Platinum group metals. Here, vehicle aged catalysts have been characterised in detail to better understand the catalyst deterioration. Such understanding have been applied in the attempts to replicate the aging in the lab.

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20 juin 2019
Modulated Excitation Raman Spectroscopy

Modulated excitation Raman spectroscopy of vanadia-based catalysts

By combining modulated excitation and Raman spectroscopy, we obtained mechanistic insights that go beyond what is currently achievable with Raman experiments under steady-state conditions.

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6 janvier 2019
steiger_chemmater_ga.jpg

Sulfur poisoning recovery on a SOFC anode material through reversible segregation of Nickel

Exploitation of the self-regenerative property of perovskite-type oxides allowed to demonstrate recovery of La0.3Sr0.55Ti0.95Ni0.05O3 from sulfur poisoning by reversible segregation-incorporation of Ni at SOFC temperatures.

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29 juin 2018
Petrov 2018 NatCom.jpg

Stable complete methane oxidation over palladium based zeolite catalysts

Using targeted synthesis and in situ characterization a palladium catalyst with improved stability against sintering during methane oxidation was prepared.

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8 mars 2018
Ferri 2018 NatCat.jpg

Time-resolved copper speciation during selective catalytic reduction of NO on Cu-SSZ-13

Through the combination of time-resolved X-ray absorption spectroscopy and transient experimentation, we were able to capture an ammonia inhibition effect on the rate-limiting copper re-oxidation at low temperature.

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17 octobre 2016
Newton 2016 JACS.jpg

Kinetic studies of the Pt carbonate-mediated, room-temperature oxidation of carbon monoxide by oxygen

The kinetics involved in ambient-temperature catalytic oxidation of carbon monoxide by oxygen over a Pt/Al2O3 catalyst is evaluated under periodic redox operation using combined mass spectrometry, diffuse reflectance infrared spectroscopy and time-resolved Pt L3-edge X-ray absorption spectroscopy.

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15 juillet 2012

Supported gold as catalyst for the decomposition of ammonia precursors in the selective catalytic reduction of NOx

Titanium dioxide-supported gold was found to catalyze the hydrolysis of formate-based ammonia precursor compounds which are proposed for the selective catalytic reduction of nitrogen oxides (NOx) in combustion exhaust gas. In contrast to other noble metals, the supported gold does not oxidize the released NH3, while it maintains decomposition of intermediate formic acid.

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15 octobre 2007

Vibrational spectra of adsorbates from DFT

The hydrolysis of isocyanic acid was studied experimentally and theoretically and a reaction mechanism on different catalysts was established. The decreasing NOx emission limits for diesel vehicles impel the further development of the existing NOx deactivation technologies, particularly the selective catalytic reduction (SCR) of nitrogen oxides with urea. In the urea-SCR process, urea is injected into the hot exhaust gas, where it thermally decomposes into isocyanic acid (HNCO) and ammonia.

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Paul Scherrer Institut
Dr. Davide Ferri
OLGA/411
5232 Villigen PSI
Switzerland

Telephone: +41 56 310 27 81
E-mail: davide.ferri@psi.ch

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Gisela Herlein
OVGA/109
5232 Villigen PSI
Switzerland

Telephone: +41 56 310 2663
E-mail: gisela.herlein@psi.ch

Group of Catalysis for Biofuels GCB

Oliver Kröcher's research group at EPFL (ETH Lausanne) targets the production of liquid biofuels by thermochemical and catalytic routes.


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