Masini, Federico1; Strebel, Christian Ejersbo1; McCarthy, David Norman1; Nierhoff, Anders Ulrik Fregerslev2; Kehres, Jan1; Fiordaliso, Elisabetta Maria3; Nielsen, Jane Hvolbæk1; Chorkendorff, Ib1
1 Department of Physics, Technical University of Denmark2 Experimental Surface and Nanomaterials Physics, Department of Physics, Technical University of Denmark3 Center for Electron Nanoscopy, Technical University of Denmark4 Center for Individual Nanoparticle Functionality, Center, Technical University of Denmark
Mass-selected Ru nanoparticles were deposited onto planar SiO2 support and their capability for the methanation reaction investigated. The catalytic activity for the methanation reaction at 100mbar under hydrogen rich conditions (1:99 CO/H2 ratio) was measured as a function of particle size. We found that the Turnover Frequency increased with nanoparticle diameter in the range 4–10nm.As the TOF decreases over reaction repetition, we investigated the possible reasons and ruled out carbon deposition as a cause for activity loss. As no particle sintering was observed, we invoked surface restructuring as a possible cause.