Investigation of the effect of Cu addition on the SO2-resistance of a Ce-Ti oxide catalyst for selective catalytic reduction of NO with NH3
Investigation of the effect of Cu addition on the SO2-resistance of a Ce-Ti oxide catalyst for selective catalytic reduction of NO with NH3
复制标题
研究添加 Cu 对 CeTi 氧化物催化剂用于 NH3 选择性催化还原 NO 的抗 SO2 性能的影响
DOI：
10.1016/j.fuel.2011.08.014
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发表时间：
2012-02-01
期刊：
影响因子：
7.4
通讯作者：
Cen, Ke-fa
中科院分区：
文献类型：
--
作者：
Du, Xue-sen;Gao, Xiang;Cen, Ke-fa
通过TEM-EDS、XRD、FTIR、SO2 + O-2 TPD、XPS、H-2-TPR、NH3-TPD等一系列表征，探讨Cu添加对Ce-Ti氧化物催化剂抗SO2性能的促进作用机理。SO2与表面铈氧发生强烈的相互作用，导致Ce4+在Ce-Ti氧化物催化剂上还原为Ce3+。Ce-Cu-Ti氧化物催化剂中的Cu原子优先与SO2相互作用，并保留相邻的Ce4+。结果表明，由于SO2的磺化作用，Ce-Ti催化剂的氧化还原能力明显降低。由于CuSO4的形成和Ce4+的保留，Ce-Cu-Ti催化剂的还原性并没有像Ce-Ti催化剂那样明显降低，但经过硫酸化后，其还原性略有降低，足以进行SCR反应。磺化作用增强了Ce-Ti和Ce-Cu-Ti的表面酸性。硫酸化后氧化还原能力的保持和表面酸度的增加使得Ce-Cu-Ti成为SCR反应的高抗so2催化剂。本文还对Cu添加量对铈钛氧化物催化剂抗so2性能的影响进行了图解描述。(C) 2011 Elsevier Ltd.版权所有。
A series of characterizations including TEM-EDS, XRD, FTIR, SO2 + O-2 TPD, XPS, H-2-TPR and NH3-TPD has been carried out to explore the mechanism of the promoting effect of Cu addition on the SO2-resistance of the Ce-Ti oxide catalyst. SO2 had been found to strongly interact with surface cerium oxygen and result in the reduction of Ce4+ to Ce3+ on the Ce-Ti oxide catalyst. The Cu atoms in the Ce-Cu-Ti oxide catalyst will preferentially interact with SO2 and preserve the adjacent Ce4+. The redox ability of the Ce-Ti catalyst was found to significantly decrease due to the sulfation by SO2. Due to the formation of CuSO4 and the preserved Ce4+, the reducibility of the Ce-Cu-Ti catalyst has not significantly decreased like the Ce-Ti catalyst but slightly decreased to an adequate level for SCR reaction after sulfation. The surface acidities of Ce-Ti and Ce-Cu-Ti were both enhanced by sulfation. The preservation of the redox ability and the increase of surface acidity after sulfation had caused Ce-Cu-Ti to be a high SO2-resistance catalyst for SCR reaction. A graphical description of the effect of the Cu addition on the SO2-resistance of a Ce-Ti oxide catalyst has also been proposed. (C) 2011 Elsevier Ltd. All rights reserved.