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- Title
Porous MnO for low-temperature NH-SCR of NO: the intrinsic relationship between surface physicochemical property and catalytic activity.
- Authors
Shi, Jian-Wen; Gao, Chen; Liu, Chang; Fan, Zhaoyang; Gao, Ge; Niu, Chunming
- Abstract
Three kinds of porous MnO catalysts consisted of nanoparticles (about 6.5, 8.5, and 21 nm, respectively) were successfully prepared by three different methods, co-precipitation method (CP), citric acid method (CA), and hydrothermal method (HT), respectively. Their physicochemical properties were characterized by TEM, XRD, BET, XPS, H-TPR, and NH-TPD in detail, and their catalytic activities were evaluated by the selective catalytic reduction (SCR) of NO with NH in the temperature range of 60~300 °C. The results showed that their catalytic activities decreased in the order of MnO/HT > MnO/CA > MnO/CP in the region of 60-120 °C due to the dominant factor resulted from the reducibility of MnO. In contrast, their catalytic activities declined in the order of MnO/CA > MnO/HT > MnO/CP in the region of 180-300 °C, which can be attributed to the amount of acid sites on the surface of these catalysts. In the region of 120-180 °C, the as-prepared three catalysts exhibited high catalytic activity with 100% NO conversion under a high gas hourly space velocity (GHSV) of 36,000 h.
- Subjects
MANGANESE dioxide; SELECTIVE catalytic oxidation; CITRIC acid; X-ray diffraction; TRANSMISSION electron microscopy
- Publication
Journal of Nanoparticle Research, 2017, Vol 19, Issue 6, p1
- ISSN
1388-0764
- Publication type
Article
- DOI
10.1007/s11051-017-3887-6