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Silver Nanoparticles Supported on CeO 2 ‐SBA‐15 by Microwave Irradiation Possess Metal–Support Interactions and Enhanced Catalytic Activity
Author(s) -
Qian Xufang,
Kuwahara Yasutaka,
Mori Kohsuke,
Yamashita Hiromi
Publication year - 2014
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201404307
Subject(s) - microwave irradiation , catalysis , nanoparticle , metal , materials science , irradiation , microwave , chemical engineering , nanotechnology , nuclear chemistry , chemistry , computer science , organic chemistry , metallurgy , engineering , telecommunications , physics , nuclear physics
Metal–support interactions (MSIs) and particle size play important roles in catalytic reactions. For the first time, silver nanoparticles supported on CeO 2 ‐SBA‐15 supports are reported that possess tunable particle size and MSIs, as prepared by microwave (MW) irradiation, owing to strong charge polarization of CeO 2 clusters (i.e., MW absorption). Characterizations, including TEM, X‐ray photoelectron spectroscopy, and extended X‐ray absorption fine structure, were carried out to disclose the influence of CeO 2 contents on the Ag particle size, MSI effect between Ag nanoparticles and CeO 2 ‐SBA‐15 supports, and the strong MW absorption of CeO 2 clusters that contribute to the MSIs during Ag deposition. The Ag particle sizes were controllably tuned from 1.9 to 3.9 nm by changing the loading amounts of CeO 2 from 0.5 to 2.0 wt %. The Ag nanoparticle size was predominantly responsible for the high turnover frequency (TOF) of 0.41 min −1 in ammonia borane dehydrogenation, whereas both particle size and MSIs contributed to the high TOF of 555 min −1 in 4‐nitrophenol reduction for Ag/0.5CeO 2 ‐SBA‐15, which were twice as large as those of Ag/SBA‐15 without CeO 2 and Ag/CeO 2 ‐SBA‐15 prepared by conventional oil‐bath heating.