Novel Powder-Supported Size-Selected Clusters for Heterogeneous Catalysis under Realistic Reaction Conditions

作者：Habibpour V; Song M Y; Wang Z W; Cookson J; Brown C M; Bishop P T; Palmer R E^*

来源：Journal of Physical Chemistry C, 2012, 116(50): 26295-26299.

DOI：10.1021/jp306263f

Well-defined nanoparticles show promise as model catalysts in the quest for new/improved practical catalysts with tunable chemical properties. Here we demonstrate the production, chemical performance, and stability of a new class of model catalyst systems, consisting of size-selected (Pd-N) nanoclusters supported on (graphite) powders suitable for realistic, test tube reaction conditions. The catalyst powders were synthesized by cluster beam deposition onto planar surface followed by microdicing. Cluster size-dependent (N = 55 to 400) catalytic activity/selectivity was observed in the vapor phase hydrogenation of 1-pentyne. Aberration-corrected scanning transmission electron microscopy of the nanocluster catalysts before and after catalytic measurements revealed the stability of the cluster catalysts against sintering. Larger nanoclusters, e.g., Pd-400, showed superior activity, thermal stability, and (very high) selectivity over a period of hours in the reactor.

• 出版日期2012-12-20