Catalytic Reactions on Nanomaterials

Introduction

Heterogeneous catalysts play an eminent role in exhaust gas cleaning or the conversion of gases for energy relevant applications such as fuel cells. They are composed of oxide supported metal nanoparticles in random crystallographic orientation, which hampers an “at work” atomic scale investigation. Our aim is to investigate the fundamental properties of supported metal and alloy nanoparticles under gas reaction conditions. This atomic scale information is a prerequisite for catalysts with tailored reaction activity, reaction product selectivity and improved lifetime.

Current research fields

  • Model catalysts under near ambient pressure reaction conditions
  • 4d transition metal alloy nanoparticles on single crystal oxide supports
  • CO oxidation induced sintering
  • Gas adsorption induced nanoparticle shape changes
  • High energy x-ray diffraction schemes for in-situ investigations of heterogeneous catalytic reactions
  • Adsorption properties of ultra-small metal nanoparticles

Contact

Dr. Heshmat Noei
Prof. Dr. Andreas Stierle

Project(s) involved

BMBF Project NanoXcat, Röntgen Angström Cluster catalysis on the atomic scale

Publications

Atomic Structure of Pt nanoclusters supported by graphene/Ir(111) and reversible transformation under CO exposure
D. Franz, N. Blanc, J. Coraux, G. Renaud, S. Runte, T. Gerber, C. Busse, T. Michely, P. Feibelman, U. Hejral, A. Stierle, Phys. Rev. B 93, p 4 (2016)

Tracking the shape-dependent sintering of platinum–rhodium model catalysts under operando conditions
U. Hejral, P. Müller, O. Balmes, D. Pontoni, A. Stierle, Nature Communications 7, 10964 (2016)

High-Energy Surface X-Ray Diffraction for Fast Surface Structure Determination, J. Gustafson, M. Shipilin, C. Zhang, A. Stierle, U. Hejral, U. Ruett, O. Gutowski, P.-A. Carlsson, M. Skoglundh, E. Lundgren, Science 343 (6172) 758-61 (2014)

Stability of surface and bulk oxides on Pd(111) revisited by in-situ x-ray diffraction
N. Kasper, P. Nolte, A. Stierle, J. Phys. Chem. C 116 (40), 21459 (2012)

Reversible Shape Changes of Pd Nanoparticles on MgO(100), P. Nolte, A. Stierle, N. Kasper, N. Jeutter, H. Dosch, Nano Lett., 11, 4697 (2011)

Shape Changes of Supported Rh Nanoparticles During Oxidation and Reduction Cycles, P. Nolte, A. Stierle, N. Y. Jin-Phillipp, N. Kasper, T. U. Schulli, H. Dosch, Science 321, 1654 (2008)