Catalytic activity of Pt catalysts promoted by MnOx for n-hexane oxidation

被引：20
作者：
Anic, Mirjana [1 ,2 ]
Radic, Nenad [1 ]
Grbic, Bosko [1 ]
Dondur, Vera [2 ]
Damjanovic, Ljiljana [2 ]
Stoychev, Dimitar [3 ]
Stefanov, Plamen [4 ]
机构：
[1] Univ Belgrade, IChTM Dept Catalysis & Chem Engn, Belgrade, Serbia
[2] Univ Belgrade, Fac Phys Chem, Belgrade, Serbia
[3] Bulgarian Acad Sci, Inst Phys Chem, BU-1113 Sofia, Bulgaria
[4] Bulgarian Acad Sci, Inst Gen & Inorgan Chem, BU-1113 Sofia, Bulgaria
来源：
APPLIED CATALYSIS B-ENVIRONMENTAL | 2011年 / 107卷 / 3-4期
关键词：
Pt/Al2O3; catalyst; Manganese oxide; Deep oxidation; n-Hexane; Promoting effect; VOLATILE ORGANIC-COMPOUNDS; MANGANESE OXIDE CATALYSTS; CRYPTOMELANE NANOMATERIALS; PARTICLE-SIZE; CO OXIDATION; COMBUSTION; PLATINUM; PT/AL2O3; TOLUENE; REMOVAL;
D O I：
10.1016/j.apcatb.2011.07.032
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The deep oxidation of n-hexane was studied over Pt catalysts with small and large Pt crystallites, promoted by MnOx. The Mn was deposited on the Pt/Al2O3 by deposition-precipitation method using two alkalis, ammonia and dimethylamine. The strength of the base influenced morphology and performances of Mn-Pt catalysts. Ammonia formed mostly spherical structure of manganese oxide, while dimethylamine created fibrous needle-like shape of MnOx, typical for cryptomelane phase of manganese oxide. This was confirmed by XPS results that show an oxidation state of Mn close to that for cryptomelane. The Pt-Mn catalysts were more active than catalysts containing Pt only. Promoting effect of MnOx is more pronounced for larger Pt crystallites. Among Pt-Mn samples, catalysts synthesized with dimethylamine exhibited the highest activities. Mobility and reactivity of oxygen from Pt-O-Mn sites associated with cryptomelane phase may be responsible for increased activity. (C) 2011 Elsevier B.V. All rights reserved.
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页码：327 / 332
页数：6
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