Premium
Tuning Single‐atom Pt 1 −CeO 2 Catalyst for Efficient CO and C 3 H 6 Oxidation: Size Effect of Ceria on Pt Structural Evolution
Author(s) -
Tan Wei,
Alsenani Hatim,
Xie Shaohua,
Cai Yandi,
Xu Peng,
Liu Annai,
Ji Jiawei,
Gao Fei,
Dong Lin,
Chukwu Ewa,
Yang Ming,
Liu Fudong
Publication year - 2020
Publication title -
chemnanomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.947
H-Index - 32
ISSN - 2199-692X
DOI - 10.1002/cnma.202000431
Subject(s) - catalysis , cerium , materials science , metal , particle size , platinum , dispersion (optics) , inorganic chemistry , cerium oxide , chemical engineering , chemistry , metallurgy , physics , optics , engineering , biochemistry
To reveal the effect of ceria particle size on dispersion and structure of supported Pt catalysts during preparation, activation, and reaction testing, a unique CeO 2 /Al 2 O 3 support (CA−c) with smaller CeO 2 particle size and more surface defects was prepared using a colloidal CeO 2 precursor, comparing with a conventional CeO 2 /Al 2 O 3 support (CA−n) using cerium nitrate as precursor. More atomically dispersed Pt and abundant Pt−O−Ce structures were observed in the Pt/CA−c catalyst than in the Pt/CA−n catalyst. Both parent catalysts received significant enhancement on their catalytic CO oxidation activities if activated by 10% hydrogen at 400 °C before reaction. Between the two representative catalysts, the extent of activity enhancement upon activation was more pronounced for Pt/CA−c. We found that smaller Pt clusters with more active ionic Pt sites were generated on the activated Pt/CA−c catalyst, while agglomerated larger Pt particles with more metallic sites were formed on the activated Pt/CA−n. The facile formation of Ce 3+ was also indicative of more active metal‐support interfaces in the activated Pt/CA−c catalyst. These results highlight the importance of regulating ceria support particles to enable a controlled anchoring and subsequent activation of Pt single atoms for low‐temperature CO oxidation reaction.