Promotion effect of tungsten oxide on photo-assisted selective catalytic reduction of NO with NH3 over TiO2
Promotion effect of tungsten oxide on photo-assisted selective catalytic reduction of NO with NH3 over TiO2
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DOI：
10.1016/j.apcatb.2008.01.032
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发表时间：
2008-09-01
影响因子：
22.1
通讯作者：
Tanaka, Tsunehiro
中科院分区：
文献类型：
--
作者：
Yamazoe, Seiji;Masutani, Yasuyuki;Tanaka, Tsunehiro
采用流动反应器研究了TiO 2在光助选择性催化还原NO反应中的活性。TiO 2的活性随酸中心量的增加而增加。密度泛函理论（DFT）计算表明，NH_2NO在弱酸位上的分解速率比在强酸位上的快，这是光催化SCR反应的速率决定步骤.通过在TiO 2上添加少量的WO 3和1.5wt.%的TiO 2，其中WO 3/TiO 2催化剂的活性最高。NH3吸附实验表明，WO 3/TiO 2催化剂的光催化活性取决于弱酸中心的数量。这一结果与DFT的计算结果一致。我们的结论是，催化剂上的弱酸位的量是一个重要的因素的光-SCR活性。(C)2008 Elsevier B. V.保留所有权利。
The activity of TiO2 in photo-assisted selective catalytic reduction of NO with NH3 (photo-SCR) was tested by using a flow reactor. The activity of TiO2 increased with increase in the amount of acid site. Density functional theory (DFT) calculations suggest that the rate of the NH2NO decomposition, which is the rate-determining step of the photo-SCR, on the weak acid site is faster than that on the strong acid site. The activity of the photo-SCR was enhanced by the addition of a small amount of WO3 on TiO2 and 1.5 wt.% WO3/TiO2 showed the highest activity among the tested. According to the NH3 adsorption experiments, the photo-SCR activity of WO3/TiO2, depends on the amount of the weak acid site. This result corresponds to the calculations by DFT. We concluded that the amount of the weak acid site on the catalyst is an important factor for the photo-SCR activity. (C) 2008 Elsevier B.V. All rights reserved.