期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 232, 期 -, 页码 108-116出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2018.03.049
关键词
Soot combustion; Cryptomelane; Potassium; Hollandite; Solid-solid reaction
资金
- National Natural Science Foundation of China [21477046]
- Key Technology R&D Program of Shandong Province [2016ZDJS11A03]
- U.S. National Science Foundation [CBET-1344792]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1344792] Funding Source: National Science Foundation
Identification of catalytically active species and reaction pathway in catalytic solid (catalyst)-solid (reactant) reactions is a nontrivial task as exemplified in diesel soot oxidation (combustion), the technology for control of diesel particulate emissions. A physical contact between catalytically active species and solid soot is usually deemed necessary. Herein, thermally-stable hollandite-type alpha-MnO2 (KxMn8O16) nanorod catalysts have been synthesized with one-dimensional tunnel structures partially filled with relatively mobile K cations. These tunnel-confined quasi free K cations are revealed to be responsible for the catalytic soot oxidation activity, proving that physical contact between soot and K cations is unnecessary for solid-solid reaction. A novel catalyst, KyTi8O16 has been successfully designed to boost the catalytic activity in TiO2 toward soot oxidation by engineering a K-contained hollandite-type isostructure.
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