NMR of platinum catalysts: Double NMR of chemisorbed carbon monoxide and a model for the platinum NMR line shape.
NMR of platinum catalysts: Double NMR of chemisorbed carbon monoxide and a model for the platinum NMR line shape.
复制标题
铂催化剂的 NMR：化学吸附一氧化碳的双 NMR 和铂 NMR 线形模型。
DOI：
10.1103/physrevb.31.5663
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发表时间：
1985
期刊：
影响因子：
--
通讯作者：
Sinfelt
中科院分区：
文献类型：
--
作者：
Makowka;Slichter;Sinfelt
The authors report observation of the NMR line of {sup 195}Pt atoms in the surface layer of small platinum-metal particles on which {sup 13}CO has been chemisorbed. The surface {sup 195}Pt atoms are resolved from those of {sup 195}Pt atoms deeper in the particle by spin-echo double resonance between {sup 195}Pt and {sup 13}C. The particles, supported on {eta}-alumina, had dispersions (fraction of the atoms that are on the surface) of 26% and 76%. Comparison with {sup 195}Pt resonance in Pt carbonyls suggests that the magnitude of the Knight shift of the surface Pt is less than 0.2%. Analysis of the {sup 195}Pt spin-lattice relaxation indicates that the small surface Knight shift results from cancellation of 6s and 5d core-polarization contributions as was found theoretically by Weinert and Freeman for clean Pt surfaces. The {sup 13}C-{sup 195}Pt indirect spin coupling is found to be very similar to those in diamagnetic platinum carbonyl molecules. The results show that CO bonds via the C atom and verify that concepts from studies of large single crystals are valid for the small particles. The key features of the {sup 195}Pt line shapes in these small platinum particles are described by a simple phenomenological modelmore » of the spatial Knight-shift variation inside these particles. The model successfully describes the major structure seen in the NMR line shapes of samples with dispersions ranging from 5% to 76%.« less
The authors report observation of the NMR line of {sup 195}Pt atoms in the surface layer of small platinum-metal particles on which {sup 13}CO has been chemisorbed. The surface {sup 195}Pt atoms are resolved from those of {sup 195}Pt atoms deeper in the particle by spin-echo double resonance between {sup 195}Pt and {sup 13}C. The particles, supported on {eta}-alumina, had dispersions (fraction of the atoms that are on the surface) of 26% and 76%. Comparison with {sup 195}Pt resonance in Pt carbonyls suggests that the magnitude of the Knight shift of the surface Pt is less than 0.2%. Analysis of the {sup 195}Pt spin-lattice relaxation indicates that the small surface Knight shift results from cancellation of 6s and 5d core-polarization contributions as was found theoretically by Weinert and Freeman for clean Pt surfaces. The {sup 13}C-{sup 195}Pt indirect spin coupling is found to be very similar to those in diamagnetic platinum carbonyl molecules. The results show that CO bonds via the C atom and verify that concepts from studies of large single crystals are valid for the small particles. The key features of the {sup 195}Pt line shapes in these small platinum particles are described by a simple phenomenological modelmore » of the spatial Knight-shift variation inside these particles. The model successfully describes the major structure seen in the NMR line shapes of samples with dispersions ranging from 5% to 76%.« less