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CO and O2 adsorption on K/Pt(111)

Bowker, Michael, Grillo, Federico and Archard, Daniel 2019. CO and O2 adsorption on K/Pt(111). Journal of Physical Chemistry C 123 (13) , pp. 8198-8205. 10.1021/acs.jpcc.8b08461

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Abstract

We have investigated CO and O2 on K promoted Pt(111) using mainly molecular beams and TPD. Surprisingly, CO adsorption is little affected by the presence of potassium on the surface up to around 1/6th of a monolayer promoter coverage (half of the maximum), even though the chemisorbed state in TPD is more strongly adsorbed. This is because the adsorption is dominated by the precursor state kinetics which are little affected by the K. However, as the K coverage increases and the layer changes from ionic to metallic, then the adsorption of CO diminishes to zero, since both CO and K are electron donors. In contrast the opposite is the case for oxygen adsorption. The sticking probability on the clean surface is very low, but is enormously enhanced at even low coverages of K, and oxygen can adsorb strongly onto the metallic layer to high coverage. A number of oxygen states can be identified in TPD, those desorbing in the same temperature range as for clean Pt, those associated with Pt affected by K at low coverage of the latter, and those on the metallic layer. The former is dissociated oxygen while the latter is molecular peroxide. View: PDF | PDF w/ Links Related Content Design of Efficient Catalysts for CO Oxidation on Titanium Carbide–Supported Platinum via Computational Study The Journal of Physical Chemistry C Wang, Yang, Chu, and Wang 0 (ja), Abstract | PDF w/ Links | Hi-Res PDF Roadmap for Modeling RhPt/Pt(111) Catalytic Surfaces The Journal of Physical Chemistry C Zheng, Ivashenko, Fjellvåg, Groot, and Sjåstad 0 (ja), Abstract | PDF w/ Links | Hi-Res PDF Article Options PDF (508 KB) PDF w/ Links (518 KB) Abstract Add to Favorites Download Citation Email a Colleague Order Reprints Rights & Permissions Citation Alerts Add to ACS ChemWorx SciFinder Subscribers Sign in Explore by: Author of this Article Any Author Research Topic Search Metrics Article Views: 9 Times Received 30 August 2018 Published online 19 October 2018 +Altmetric Logo IconMore Article Metrics CURRENT ISSUELATEST NEWS COVER STORYCover image The to-do list for ‘clean’ meat A little over five years ago, Mark Post, a professor of vascular physiology at Maastricht University,... SCIENCE CONCENTRATESArticle Image Fluorinated coating is utterly repellent Some liquid-repelling coatings stay dry in a deluge of water, while others rebuff oils and organic solvents.... BUSINESS CONCENTRATESArticle Image Amazon unveils chemical policy A new chemical policy is coming to a small corner of Amazon’s vast online bazaar. The retailer says its... POLICY CONCENTRATESArticle Image Industry initiatives can help women’s careers, survey shows Efforts by companies to encourage women in science, technology, engineering, and mathematics (STEM) careers... Chemistry in Pictures: An alchemist’s garden Electron crystallography could be a powerful tool for organic chemists Two teams demonstrate the visualization of small molecules with electron-bombarding technique Researchers unravel how spiders store their silk The arachnids pack their threads as nanoparticles, a finding that could aid production of ... New EU copyright legislation gets mixed reactions Some claim it provides too much access to material at the expense of copyright ... The to-do list for ‘clean’ meat Many start-ups want to commercialize animal-free meat. Here’s what they have to do first Masked aldehyde makes mild radical reaction possible New strategy offers easy access to valuable ketyl radicals Join ACS Chemical Neuroscience and ACS Publications in San Diego for Neuroscience 2018 Each year the Society for Neuroscience gathers for their annual meeting. Neuroscience 2018 expects ... Celebrate National Chemistry Week with Resources from ACS Earth and Space Chemistry National Chemistry Week is a community-based annual event that unites ACS local sections, businesses, ... Celebrate National Chemistry Week 2018 with Astrochemistry Resources from the Journal of Chemical Education National Chemistry Week is a community-based annual event that unites ACS local sections, businesses, ... How to Read and Publish Open Access Chemistry Research Whether you’re a first-time author looking to publish your first research paper, a seasoned ... Cristina Nevado’s Personal Story of Discovery Professor Cristina Nevado has a passion for art. Like an artist, she’s always found ... Exploring a New Approach to Predicting Toxicity A five-step process could offer a method for linking biochemical characterization of toxic responses ...

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Publisher: American Chemical Society
ISSN: 1932-7447
Date of First Compliant Deposit: 23 October 2018
Date of Acceptance: 19 October 2018
Last Modified: 20 Oct 2019 08:13
URI: http://orca-mwe.cf.ac.uk/id/eprint/116125

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