Morphology-Dependent Properties of MnOx/ZrO2鈥揅eO2 Nanostructures for the Selective Catalytic Reduction of NO with NH3

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• 作者：Ruihua Gao ; Dengsong Zhang ; Phornphimon Maitarad ; Liyi Shi ; Thanyada Rungrotmongkol ; Hongrui Li ; Jianping Zhang ; Weiguo Cao
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：May 23, 2013
• 年：2013
• 卷：117
• 期：20
• 页码：10502-10511
• 全文大小：614K
• 年卷期：v.117,no.20(May 23, 2013)
• ISSN：1932-7455

文摘

The morphology effect of ZrO₂鈥揅eO₂ on the performance of MnO_x/ZrO₂鈥揅eO₂ catalyst for the selective catalytic reduction of NO with ammonia was investigated. The catalytic tests showed that the MnO_x/ZrO₂鈥揅eO₂ nanorods achieved significantly higher NO conversions than the nanocubes and nanopolyhedra. The catalytic tests also showed that the MnO_x/ZrO₂鈥揅eO₂ nanorods achieved a significantly higher rate constant with respect to NO conversion than that of the nanocubes and nanopolyhedra. On the nanorods, the apparent activation energy is 25 kJ mol^鈥?, which was much lower than the values of nanocubes and nanopolyhedra (42 and 43 kJ mol^鈥?). The high resolution transmission electron microscopy showed that the nanorods predominately exposed {110} and {100} planes. It was demonstrated that the ZrO₂鈥揅eO₂ nanorods had a strong interaction with MnO_x species, which resulted in great superiority for the selective catalytic reduction of NO. The excellent catalytic activity of the MnO_x/ZrO₂鈥揅eO₂ nanorods should be attributed to the Mn⁴⁺ species, adsorbed surface oxygen and oxygen vacancies which are associated with their exposed {110} and {100} planes.