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Correlation between Microstructure Evolution of a Well‐Defined Cubic Palladium Catalyst and Selectivity during Acetylene Hydrogenation
Author(s) -
Niu Yiming,
Zhang Bingsen,
Luo Jingjie,
Zhang Liyun,
Chen ChengMeng,
Su Dang Sheng
Publication year - 2017
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201700020
Subject(s) - acetylene , selectivity , catalysis , palladium , ethylene , microstructure , adsorption , desorption , materials science , chemical engineering , photochemistry , chemistry , crystallography , organic chemistry , engineering
The varied surface structures of a Pd catalyst showed different catalytic performances in the partial hydrogenation of acetylene. The exposed Pd (1 0 0) facet is considered to be the most selective of all other facets for the formation of ethylene, but it is unstable and the fine structure needs to be revealed during the reaction. Herein, the evolution of the surface structure of cubic Pd nanoparticles, which are all bound with (1 0 0) facets, was studied by transmission electron microscopy in the partial hydrogenation of acetylene. Furthermore, the relation between the varying surface structure and the activity/selectivity was correlated. The (1 0 0) facets of Pd were transformed into stepped facets during the reaction, derived by adsorption/desorption of the reactants and energy compensation, which was the main reason for the decrease in the selectivity towards ethylene.