Journal
APPLIED CATALYSIS A-GENERAL
Volume 433, Issue -, Pages 206-213Publisher
ELSEVIER
DOI: 10.1016/j.apcata.2012.05.016
Keywords
Hydrothermal preparation method; Water-bathing preparation method; Well-defined morphology; Manganese oxide catalyst; Toluene combustion
Categories
Funding
- NSF of Beijing Municipality [2102008]
- NSF of China [20973017, 21077007]
- National High-Tech Research and Development (863) Program of China [2009AA063201]
- Creative Research Foundation of Beijing University Technology [00500054R4003, 005000543111501]
- Funding Project for Academic Human Resources Development in Institutions of Higher Learning under the Jurisdiction of Beijing Municipality [PHR201007105, PHR201107104]
- Foundation of the Hong Kong Baptist University [FRG2/09-10/023]
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The rod-like tetragonal alpha-MnO2, flower-like hexagonal epsilon-MnO2, and dumbbell-like tetragonal beta-MnO2 were prepared using the hydrothermal or water-bathing method under different conditions. It is shown that the alpha-MnO2, epsilon-MnO2, and beta-MnO2 catalysts possessed a surface area of ca. 53, 30, and 114 m(2)/g, respectively. The oxygen adspecies concentration and low-temperature reducibility decreased in the order of alpha-MnO2 > epsilon-MnO2 > beta-MnO2, coinciding with the sequence of their catalytic activities for toluene combustion. The well-defined morphological MnO2 catalysts performed much better than the bulk counterpart. At a space velocity of 20,000 mL/(g h), the temperature for 90% toluene conversion was 238, 229, and 241 degrees C over alpha-MnO2, epsilon-MnO2, and beta-MnO2, respectively. The apparent activation energies of alpha-MnO2, epsilon-MnO2, and beta-MnO2 were in the range of 20-26 kJ/mol. It is concluded that higher oxygen adspecies concentrations and better low-temperature reducibility were responsible for the good catalytic performance of the alpha-MnO2, epsilon-MnO2, and beta-MnO2 materials. (C) 2012 Elsevier B.V. All rights reserved.
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