We would like to wish you welcome to the second webinar arranged by the Working group Catalysis (under the theme New Materials).
When: Tuesday, May 18, 15.00 - 16.00 CET
Where: on Zoom (The link is obtained after registration)
Cost: No fees
Registration: https://lu-se.zoom.us/meeting/register/u5EocuqhrDMjGNH_3HrFlVJnksw4bsoM0VsQ
Speaker: Lindsay Merte, Malmö University, Sweden
Title: Oxide formation at Pt-Sn model catalyst surfaces
Bio:
Lindsay Merte is a Senior Lecturer at the Dept. of Materials Science and Applied Mathematics, Malmö University. His main research areas are surface physics and heterogeneous catalysis, with particular focus on metal oxide surface structure and reactivity. This research involves application of multiple hard- and soft-X-ray methods, as well as high-resolution scanning tunneling microscopy and development of sample environments for in situ characterization.
Abstract:
Tin has been exploited as a promoter of platinum catalysts for decades, particularly for application in naphtha reforming and in direct-alcohol fuel cells. Pt-Sn electrocatalysts show high activities for oxidation reactions and high tolerance against CO poisoning. However, the bimetallic system is complex and dynamic, with tin potentially present in alloyed form, as 2+ or 4+ oxides, or mixtures of these, and catalytic reactions can take place on any of these phases or at the interfaces between them. Facile oxidation and reduction processes furthermore enable transformations between these phases under reaction conditions. Fundamental studies are needed to disentangle these effects, to resolve the structures of the active sites for reactions on these catalysts and the factors that govern their formation and properties.
I will present our recent investigations of the behavior of Pt3Sn(111) single crystals, which serve as simplified models for Pt-Sn catalysts. Our main focus so far has been on the oxidation of Pt3Sn(111) surfaces and on the structures and properties of the oxides that are formed. A first step toward understanding this complex system has been the determination of the structure of a 2D SnOx wetting layer on the Pt3Sn(111) surface, which has been achieved by application of large-scale DFT-and machine-learning-based global optimization, together with scanning probe microscopy and surface X-ray diffraction. In situ studies at high vacuum and millibar pressures of CO and O2 reveal the formation and transformations of these and related tin oxide wetting layers, and provide insight into the behavior of the complex material system under reaction conditions.
/ The Catalysis working group
During our events we sometimes take photographs and short film clips to profile our activities. Please let us know if you don’t want to be in any photos/films before we start the event. Some webinars are recorded to be used for educational purposes in the LINXS website.
By registering to our events you give your permission to LINXS, according to the General Data Protection Regulation (GDPR), to register your name and e-mail address to be used for the sole purpose of distributing newsletters and communications on LINXS activities.