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Ce‐Pr Mixed Oxide Catalysts with a Fibrous Morphology for Low‐temperature PM Oxidation
Author(s) -
Jeong Eun J.,
Lee Jae H.,
Lee Seong H.,
Park Chung S.,
Choung Jin W.,
Kim Chang H.,
Lee KwanYoung
Publication year - 2019
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201802011
Subject(s) - catalysis , cerium oxide , cerium , oxide , chemical engineering , materials science , nanorod , oxygen , inorganic chemistry , nanofiber , oxygen storage , catalytic oxidation , chemistry , nanotechnology , metallurgy , organic chemistry , engineering
Ceria (CeO 2 ) is an effective precious‐metal‐free catalyst that combusts PM (particulate matter), due to its ability to switch between Ce 4+ and Ce 3+ . In this work, to improve the activity of a ceria‐based catalyst, cerium‐praseodymium mixed oxide catalysts with various Ce−Pr ratios were synthesized with nanofiber morphologies, characterized, and compared with ceria catalysts. Two factors were considered: morphology and Ce−Pr ratio, which result in synergistic effects. In the ceria catalyst, we confirmed that a fibrous morphology is more advantageous for PM oxidation compared to nanocubes and nanorods with cubes, even though these samples have larger surface areas. In addition, the incorporation of Pr into the ceria nanofiber catalyst enhanced its intrinsic properties by promoting the reducibility and formation of oxygen vacancies. The analysis showed improved oxygen storage and supply capacity, especially for oxygen that is chemically adsorbed on the catalytic surface. PM oxidation tests demonstrated the Ce 0.5 Pr 0.5 O 2 ‐NF catalyst showed the best activity in air, which was consistent with the characterization results. Thus, the Ce 0.5 Pr 0.5 O 2 ‐NF sample was shown to be an effective and promising catalyst for PM oxidation.