Segregation dynamics of a Pd-Ag surface during CO oxidation investigated by NAP-XPS

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MARC

Strømsheim, Marie D.Norwegian University of Science and Technology (author)

Segregation dynamics of a Pd-Ag surface during CO oxidation investigated by NAP-XPS

Article/chapterEnglish2022

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Elsevier BV,2022

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LIBRIS-ID:oai:lup.lub.lu.se:dd1b5ab4-887f-49b6-8538-84e944d5c2c9
https://lup.lub.lu.se/record/dd1b5ab4-887f-49b6-8538-84e944d5c2c9URI
https://doi.org/10.1016/j.cattod.2021.02.007DOI

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Language:English
Summary in:English

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SwePubSwePub

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Subject category:art swepub-publicationtype
Subject category:ref swepub-contenttype

Notes

The dynamic changes in composition in the near-surface region of a Pd75%Ag25%(100) single crystal were monitored using near-ambient pressure x-ray photoelectron spectroscopy (NAP-XPS) during CO oxidation under oxygen rich conditions at a total pressure of 1.1 mbar. Six CO oxidation temperature cycles were investigated at different heating rates and maximum temperatures of 450 °C or 600 °C. It was found that the history of the bimetallic sample plays an important role, as the CO2 formation profile varies depending on initial conditions, and previous heating rates and maximum temperatures. In terms of CO coverage effects, normal, reversed and no hysteresis behaviour were all observed. In agreement with previous modelling predictions, the NAP-XPS data confirm a dynamic segregation behaviour upon heating/cooling where the amount of Pd in the surface region decreases with increasing temperature. Nevertheless, the Pd 3d5/2 core level relative area assessment is not fully capable of capturing all the surface dynamics inferred from the temperature dependent CO2 formation profiles, due to the probing depth. While residing at ambient temperature in the reaction mixture, however, there is a build-up of adsorbed CO at the surface showing that CO induces segregation of Pd to the topmost surface layer under these conditions. In total, this suggests that the segregation is kinetically relatively facile during temperature cycling, and that adsorbate coverage is the main controlling factor for the surface termination.

Subject headings and genre

TEKNIK OCH TEKNOLOGIER Kemiteknik Kemiska processer hsv//swe
ENGINEERING AND TECHNOLOGY Chemical Engineering Chemical Process Engineering hsv//eng
NATURVETENSKAP Biologi Biokemi och molekylärbiologi hsv//swe
NATURAL SCIENCES Biological Sciences Biochemistry and Molecular Biology hsv//eng
NATURVETENSKAP Fysik Den kondenserade materiens fysik hsv//swe
NATURAL SCIENCES Physical Sciences Condensed Matter Physics hsv//eng
Bimetallic catalysis
Carbon monoxide oxidation
Palladium
Segregation
Silver
Single crystal surface

Added entries (persons, corporate bodies, meetings, titles ...)

Svenum, Ingeborg HeleneFoundation for Scientific and Industrial Research (SINTEF),Norwegian University of Science and Technology (author)
Mahmoodinia, MehdiNorwegian University of Science and Technology (author)
Boix, VirgíniaLund University,Lunds universitet,Synkrotronljusfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Synchrotron Radiation Research,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)vi7758bo (author)
Knudsen, JanLund University,Lunds universitet,NanoLund: Centre for Nanoscience,Annan verksamhet, LTH,Lunds Tekniska Högskola,MAX IV-laboratoriet,Synkrotronljusfysik,Fysiska institutionen,Institutioner vid LTH,Other operations, LTH,Faculty of Engineering, LTH,MAX IV Laboratory,Synchrotron Radiation Research,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)slju-jks (author)
Venvik, Hilde J.Norwegian University of Science and Technology (author)
Norwegian University of Science and TechnologyFoundation for Scientific and Industrial Research (SINTEF) (creator_code:org_t)

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In:Catalysis Today: Elsevier BV384-386, s. 265-2730920-5861

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