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Author:

Liu, Yuxi (Liu, Yuxi.) | Dai, Hongxing (Dai, Hongxing.) | Du, Yucheng (Du, Yucheng.) | Deng, Jiguang (Deng, Jiguang.) | Zhang, Lei (Zhang, Lei.) | Zhao, Zhenxuan (Zhao, Zhenxuan.)

Indexed by:

EI Scopus SCIE

Abstract:

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 (32-38 m(2)/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. 300M-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 = 1000 ppm, toluene/O-2 molar ratio = 1/400, and space velocity = 20,000 mL/(g h), 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 degrees C, respectively. The apparent activation energies (58-61 kJ/mol) for toluene combustion over the LaMnO3-PL-1-3 catalysts were much lower than that (97 kJ/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. (C) 2012 Elsevier BM. All rights reserved.

Keyword:

Toluene combustion Lanthanum manganite Mesoporous skeletons Surfactant-assisted poly(methyl methacrylate)-templating method Three-dimensionally ordered macroporous perovskite-type oxide

Author Community:

  • [ 1 ] [Liu, Yuxi]Beijing Univ Technology, Coll Environm & Energy Engn, Dept Chem & Chem Engn, Lab Catalysis Chem & Nanosci, Beijing 100124, Peoples R China
  • [ 2 ] [Dai, Hongxing]Beijing Univ Technology, Coll Environm & Energy Engn, Dept Chem & Chem Engn, Lab Catalysis Chem & Nanosci, Beijing 100124, Peoples R China
  • [ 3 ] [Deng, Jiguang]Beijing Univ Technology, Coll Environm & Energy Engn, Dept Chem & Chem Engn, Lab Catalysis Chem & Nanosci, Beijing 100124, Peoples R China
  • [ 4 ] [Zhang, Lei]Beijing Univ Technology, Coll Environm & Energy Engn, Dept Chem & Chem Engn, Lab Catalysis Chem & Nanosci, Beijing 100124, Peoples R China
  • [ 5 ] [Zhao, Zhenxuan]Beijing Univ Technology, Coll Environm & Energy Engn, Dept Chem & Chem Engn, Lab Catalysis Chem & Nanosci, Beijing 100124, Peoples R China
  • [ 6 ] [Du, Yucheng]Beijing Univ Technology, Coll Mat Sci & Engn, Minist Educ, Key Lab Adv Funct Mat, Beijing 100124, Peoples R China

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Source :

APPLIED CATALYSIS B-ENVIRONMENTAL

ISSN: 0926-3373

Year: 2012

Volume: 119

Page: 20-31

2 2 . 1 0 0

JCR@2022

ESI Discipline: CHEMISTRY;

JCR Journal Grade:1

CAS Journal Grade:1

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count:

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 1

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