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The Influence of Size and Shape of Pd Nanoparticles on the Performances of Pd/Beta Catalysts for n ‐Heptane Hydroisomerization
Author(s) -
Chen Huimin,
Liu Suyao,
Yin Junqing,
Gao Xiang,
Tao Zhichao,
Wu Baoshan,
Xiang Hongwei,
Yang Yong,
Li Yongwang
Publication year - 2019
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.201900740
Subject(s) - catalysis , heptane , octahedron , nanoparticle , selectivity , materials science , cubic crystal system , hydrogen , crystallography , chemistry , chemical engineering , crystal structure , inorganic chemistry , nanotechnology , organic chemistry , engineering
Several Pd/Beta catalysts with cubic (9 nm, 12 nm, 16 nm) and truncated‐octahedral (18 nm) Pd nanoparticles (NPs) were prepared to investigate the effect of size and shape of Pd NPs for n‐ heptane hydroisomerization. Characterizations confirmed that the cubic Pd NPs solely exposed {100} crystal plane and truncated‐octahedral Pd NPs were enclosed by {100} and {111} crystal planes, and that the desorption temperature of subsurface hydrogen on Pd NPs showed size and shape dependence. Hydroisomerization results exhibits that the catalyst with 9 nm cubic Pd NPs displayed the higher isomers selectivity compared to the catalyst with 12 nm cubic NPs, 18 nm truncated octahedral NPs and 16 nm cubic NPs at similar conversion. This result suggested the size and shape dependence of (de)hydrogenation activity of Pd NPs, and further revealed the key role of subsurface hydrogen in determining the (de)hydrogenation activity.