Premium
The Metal–Support Interaction Concerning the Particle Size Effect of Pd/Al 2 O 3 on Methane Combustion
Author(s) -
Murata Kazumasa,
Mahara Yuji,
Ohyama Junya,
Yamamoto Yuta,
Arai Shigeo,
Satsuma Atsushi
Publication year - 2017
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201709124
Subject(s) - particle size , methane , particle (ecology) , catalysis , materials science , nanoparticle , metal , adsorption , transmission electron microscopy , combustion , phase (matter) , chemical engineering , analytical chemistry (journal) , chemistry , nanotechnology , metallurgy , organic chemistry , oceanography , geology , engineering
The particle size effect of Pd nanoparticles supported on alumina with various crystalline phases on methane combustion was investigated. Pd/θ, α‐Al 2 O 3 with weak metal‐support interaction showed a volcano‐shaped dependence of the catalytic activity on the size of Pd particles, and the catalytic activity of the strongly interacted Pd/γ‐Al 2 O 3 increased with the particle size. Based on a structural analysis of Pd nanoparticles using CO adsorption IR spectroscopy and spherical aberration‐corrected scanning/transmission electron microscopy, the dependence of catalytic activity on Pd particle size and the alumina crystalline phase was due to the fraction of step sites on Pd particle surface. The difference in fraction of the step site is derived from the particle shape, which varies not only with Pd particle size but also with the strength of metal–support interaction. Therefore, this interaction perturbs the particle size effect of Pd/Al 2 O 3 for methane combustion.