Direct atomic level structural analysis of metallic and bimetallic catalytic clusters and their interaction with catalytic support under in-situ and ex-situ conditions
EMSL Project ID
47709
Abstract
This project will focus on probing the structure-property relationship of heterogeneous catalytic clusters under dynamic operating conditions. The key issue is to develop a detailed understanding of the atomistic nature of metal and bimetallic clusters and their interaction with catalysts support under ambient and catalytic conditions. We will investigate a class of transition metal (TM) clusters (e.g., Pt, Ir, Pd) supported by ?-Al2O3 and MgAl2O4 substrates. The atomic nature of the catalysts will be studied with environmental aberration-corrected high-resolution transmission electron microscopy (ETEM) and scanning transmission electron microscope STEM in high-angle annular dark field (HAADF) imaging. Due to the complexity of these catalytic systems, the results obtained from STEM/TEM will be complemented by XAS, infrared (IR), and Raman spectroscopy techniques, and the combined experimental results will be integrated with DFT methods to create quantitative models in order to directly relate the structure and catalytic performance. The in situ and ex-situ studies are expected to advance the fundamental understanding of catalytic properties of metal and bimetallic metals clusters supported by various oxide ?-Al2O3, MgAl2O4 substrates. The results will have impact on design and optimization of new heterogeneous catalyst systems.
Project Details
Start Date
2012-10-26
End Date
2013-11-03
Status
Closed
Released Data Link
Team
Principal Investigator
Co-Investigator(s)
Team Members
Related Publications
Ewbank JL, L Kovarik, CC Kenvin, and C Sievers. 2014. "Effect Of Preparation Methods On The Performance Of Co/Al2O3 Catalysts For Dry Reforming Of Methane." Green Chemistry 16(2):885-896. doi:10.1039/c3gc41782d
Kovarik L, A Genc, CM Wang, A Qiu, CHF Peden, J Szanyi, and JH Kwak. 2013. "Tomography and High-Resolution Electron Microscopy Study of Surfaces and Porosity in a Plate-Like ?-Al2O3." Journal of Physical Chemistry C 117(1):179?186. doi:10.1021/jp306800h
Kovarik L, ME Bowden, A Genc, J Szanyi, CHF Peden, and JH Kwak. 2014. "Structure of ?-Alumina: Toward The Atomic Level Understanding Of Transition Alumina Phases." Journal of Physical Chemistry C 118:18051-18058. doi:10.1021/jp500051j
Kwak JH, L Kovarik, and J Szanyi. 2013. "CO2 Reduction on Supported Ru/Al2O3 Catalysts: Cluster Size Dependence of Product Selectivity." ACS Catalysis 3(11):2449-2455. doi:10.1021/cs400381f
Kwak JH, L Kovarik, and J Szanyi. 2013. "Heterogeneous Catalysis on Atomically Dispersed Supported Metals: CO2 Reduction on Multifunctional Pd Catalysts." ACS Catalysis 3(9):2094-2100. doi:10.1021/cs4001392