Low-temperature selective catalytic reduction of NO with NH3 over Ti0.9M0.1O2-δ (M = Cr, Mn, Fe, Co, Cu)
Low-temperature selective catalytic reduction of NO with NH3 over Ti0.9M0.1O2-δ (M = Cr, Mn, Fe, Co, Cu)
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DOI：
10.1021/jp7117086
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发表时间：
2008-04-17
影响因子：
3.7
通讯作者：
Madras, Giridhar
中科院分区：
文献类型：
--
作者：
Roy, Sounak;Viswanath, B.;Madras, Giridhar
采用溶液燃烧法在锐钛矿相合成了ti0.9 m0.1 o2 - δ (M = Cr, Mn, Fe, Co, Cu)催化剂。在这些催化剂上研究了NH3选择性催化还原NO。在ti0.9 mn0.1 o2 - δ上反应温度最低，但对N-2的选择性在ti0.9 fe0.1 o2 - δ上最高。因此，在TiO2 （Ti0.9Mn0.05Fe0.05O2-delta）中，Mn和Fe均被取代。反应在低温下进行，反应选择性高。为了了解反应机理和活性位点的性质，进行了NH3的程序升温解吸（TPD）和吸氢研究。建立了Lewis酸位点与SCR窗口的关系以及Bronsted酸位点与低温的关系。考察了SCR反应中NO、NH3和O-2的反应顺序。结果还表明，SCR反应的N-2选择性与氨的氧化呈较强的负相关。
The catalysts, Ti0.9M0.1O2-delta (M = Cr, Mn, Fe, Co, Cu), were synthesized in anatase phase by solution combustion. Selective catalytic reduction (SCR) of NO with NH3 was investigated over these catalysts. The reaction occurred at the lowest temperature over Ti0.9Mn0.1O2-delta, but the selectivity for N-2 was highest over Ti0.9Fe0.1O2-delta. Therefore, both Mn and Fe were substituted in TiO2 (Ti0.9Mn0.05Fe0.05O2-delta). The reaction occurred at low temperature with a high selectivity over this catalyst. In order to understand the reaction mechanism and the nature of the active sites, temperature programmed desorption (TPD) of NH3 and hydrogen uptake studies were carried out. The relation between the Lewis acid sites and SCR window and the relation between Bronsted acid sites and low temperature was established. The order of the SCR reaction with respect to NO, NH3, and O-2 was also investigated. It was also shown that the N-2 selectivity of the SCR reaction has a strong inverse correlation with the oxidation of ammonia.