Journal
CATALYSIS COMMUNICATIONS
Volume 105, Issue -, Pages 26-30Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.catcom.2017.11.007
Keywords
Perovskite; Ce doping; Acid etching; Reactive oxygen; Low-temperature oxidation
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Funding
- National Key Research and Development Program of China [2016YFC0205000]
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A high-surface-area La-Ce-Mn mixed oxide was synthesized by citrate method, with further acid etching to dissolve the La3+ ions in the lattice. The acid etching process efficiently improved the specific surface area, increased the ratios of Mn4+ /Mnn+, Ce3+/Cen+, O-alpha/O-tot, and enhanced the oxygen mobility of the catalyst, which were responsible for the superior catalytic performance. Compared to the pristine La8.8Ce0.2MnO3 + delta catalyst, the etched one could convert CO and C3H8 more efficiently, with 90% conversion of CO and C3H8 at only 73 and 196 degrees C, respectively. Such superior catalytic performance made it possible to be used for automotive emission control during cold-start period.
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