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O: Fachverband Oberflächenphysik

O 61: Heterogeneous Catalysis

O 61.6: Poster

Dienstag, 21. März 2017, 18:30–20:30, P2-OG2

Size dependence of supported Rh nanoclusters in the decomposition of methanol — •Ting-Chieh Hung¹, Ting-Wei Liao¹, Zhen-He Liao¹, Po-Wei Hsu¹, Pei-Yang Cai¹, Hsuan Lee¹, Yu-Ling Lai², Yao-Jane Hsu², Hui-Yu Chen³, Jeng-Han Wang³, and Meng-Fan Luo¹ — ¹Department of Physics, National Central University, Taiwan — ²National Synchrotron Radiation Research Center, Taiwan — ³Department of Chemistry, National Taiwan Normal University, Taiwan

Catalyzed methanol decomposition has been extensively studied as a principal reaction in direct methanol fuel cells. The process provides not only an efficient transformation from chemical energy to electricity but also a convenient source of hydrogen. To shed light on the reaction, we perform experiments on a realistic model system, oxide-supported Rh nanoclusters. We present the study of adsorption and decomposition of methanol on Rh clusters grown on an ordered thin film of θ-Al₂O₃/NiAl(100) by combining infrared absorption spectroscopy (IRAS), temperature programmed desorption (TPD) and synchrotron-based photoemission spectroscopy (PES). The investigation shows that methanol adsorbs at 100 K and the formation of CO begins at about 200 K. The quantities of CO and H₂ (D₂) produced per Rh surface site remain unaltered on clusters of diameter >1.5 nm and height >0.6 nm. In contrast, on clusters with diameter <1.5 nm and height <0.6 nm, the production per Rh surface site increases with decreasing size. In this presentation, we will discuss the size dependence of oxide supported Rh clusters in the decomposition of methanol.