Lysine-aided PMMA-templating preparation and high performance of three-dimensionally ordered macroporous LaMnO3 with mesoporous walls for the catalytic combustion of toluene - 文章详情页

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Rhombohedrally　crystallized　three-dimensionally　ordered　macroporous　(3DOM)　perovskite-type　oxides　LaMnO3　with　mesoporous　skeletons　were　prepared　using　the　poly(ethylene　glycol)　(PEG)-　and/or　l-lysine-assisted　poly(methyl　methacrylate)　(PMMA)-templating　method.　Physicochemical　properties　of　the　materials　were　characterized　by　numerous　analytical　techniques.　Catalytic　performance　of　the　as-prepared　LaMnO3　samples　was　evaluated　for　the　combustion　of　toluene.　It　is　found　that　addition　of　appropriate　amounts　of　PEG400　and　l-lysine　was　beneficial　for　the　generation　of　high-quality　3DOM-structured　LaMnO3　(denoted　as　LaMnO3-PL-1,　LaMnO3-PL-2,　and　LaMnO3-PL-3　derived　with　a　PEG400/l-lysine　molar　ratio　of　1.23,　0.61,　and　0.31,　respectively)　with　mesoporous　skeletons　and　high　surface　areas　(32-38m2/g).　Among　the　LaMnO3　samples,　the　LaMnO3-PL-2　one　possessed　the　largest　surface　area　and　the　highest　contents　of　surface　Mn4+　and　adsorbed　oxygen　species.　3DOM-structured　LaMnO3　showed　better　low-temperature　reducibility　than　bulk　LaMnO3,　with　the　LaMnO3-PL-2　sample　displaying　the　best　low-temperature　reducibility.　Under　the　conditions　of　toluene　concentration=1000ppm,　toluene/O2　molar　ratio=1/400,　and　space　velocity=20,000mL/(gh),　the　porous　LaMnO3　catalysts　remarkably　outperformed　the　nonporous　bulk　counterpart;　over　the　best-performing　LaMnO3-PL-2　catalyst,　the　temperatures　required　for　toluene　conversion=50　and　90%　were　ca.　226　and　249°C,　respectively.　The　apparent　activation　energies　(58-61kJ/mol)　for　toluene　combustion　over　the　LaMnO3-PL-1-3　catalysts　were　much　lower　than　that　(97kJ/mol)　over　the　bulk　LaMnO3　catalyst.　It　is　concluded　that　the　large　surface　area,　high　oxygen　adspecies　content,　good　low-temperature　reducibility,　and　unique　bimodal　pore　structure　were　responsible　for　the　good　performance　of　3DOM-architectured　LaMnO3　with　mesoporous　skeletons　for　toluene　combustion.　©　2012　Elsevier　B.V.

关键词：

Activation energy Amino acids Catalysis Catalysts Combustion Esters Lanthanum compounds Manganese compounds Manganites Mesoporous materials Molar concentration Molar ratio Musculoskeletal system Oxygen Perovskite Physicochemical properties Polyethylene glycols Pore structure Temperature Toluene

作者机构：

[ 1 ] [Liu, Yuxi]Laboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
[ 2 ] [Dai, Hongxing]Laboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
[ 3 ] [Du, Yucheng]Key Lab of Advanced Functional Materials, Ministry of Education, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
[ 4 ] [Deng, Jiguang]Laboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
[ 5 ] [Zhang, Lei]Laboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
[ 6 ] [Zhao, Zhenxuan]Laboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China

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hxdai@bjut.edu.cn

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