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Mesoporous Cu‐Ce‐O x Solid Solutions from Spray Pyrolysis for Superior Low‐Temperature CO Oxidation
Author(s) -
Li Rengui,
Yang Yixuan,
Sun Na,
Kuai Long
Publication year - 2019
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.201903680
Subject(s) - bimetallic strip , solid solution , mesoporous material , catalysis , materials science , pyrolysis , thermal stability , activation energy , reactivity (psychology) , precipitation , copper , chemical engineering , metal , inorganic chemistry , chemistry , metallurgy , medicine , alternative medicine , physics , pathology , meteorology , engineering , biochemistry
Development of Pt group metal‐free catalysts for low‐temperature CO oxidation remains critical. In this work, active and stable mesoporous Cu‐Ce‐O x solid solutions are prepared by using spray pyrolysis. The specific surface areas and pore volumes reach as high as 170 m 2 g −1 and 0.24 cm 3 g −1 , respectively. The results of CO oxidation study suggest that (1) the catalyst obtained by spray pyrolysis possesses much higher activity than those made by co‐precipitation, sol‐gel, and hydrothermal methods; (2) the optimal Cu 0.2 ‐Ce 0.8 ‐O x solid solution presents a reactivity over 28 times that of both single‐component CuO and CeO 2 at 70 °C. Based on the study of pure‐phase Cu‐Ce‐O x solid solutions by selective leaching of segregated CuO x species, the active center for CO oxidation is confirmed as the bimetallic Cu‐Ce‐O site, whereas the individual CuO x particles not only act as spectators but also block the active Cu‐Ce‐O sites. A low apparent activation energy of approximately 48 kJ mol −1 is detected for CO oxidation at the Cu‐Ce‐O site, making Cu‐Ce‐O x solid solutions able to present high activity at low temperature. Furthermore, the Cu‐Ce‐O x catalysts exhibit excellent stability and thermal tolerance toward CO oxidation.