NOx storage/reduction over alkali-metal-nitrate impregnated titanate nanobelt catalysts and investigation of alkali metal cation migration using XPS
NOx storage/reduction over alkali-metal-nitrate impregnated titanate nanobelt catalysts and investigation of alkali metal cation migration using XPS
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DOI：
10.1016/j.cattod.2011.10.018
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发表时间：
2012-04
期刊：
影响因子：
5.3
通讯作者：
A. Yoshida;Weihua Shen;T. Eda;R. Watanabe;Tetsu Ito;S. Naito
中科院分区：
文献类型：
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作者：
A. Yoshida;Weihua Shen;T. Eda;R. Watanabe;Tetsu Ito;S. Naito
我们之前报道过，KNO 3-和Pt-浸渍的钛酸钾纳米带（KTN）催化剂表现出高的存储容量和优异的催化循环NOx存储还原（NSR）反应。在本研究中，我们比较了各种碱金属硝酸盐浸渍的KTN催化剂的NSR行为，这表明KNO 3浸渍的催化剂表现出优越的上级性能。XPS和XRD分析表明，K+从KTN本体向表面硝酸盐的迁移比Na+的迁移更为显著。可能由于这个原因，KNO 3浸渍的KTN材料表现出NSR催化循环的最佳性能。
We reported earlier that KNO3- and Pt-impregnated potassium titanate nanobelt (KTN) catalysts exhibit high storage capacity and excellent catalytic cycles for NOxstorage-reduction (NSR) reaction. In the present study, we compared the NSR behavior of various alkali-metal-nitrate impregnated KTN catalysts, which revealed that the KNO3-impregnated catalyst exhibited superior performance. The XPS and XRD analyses of the NaNO3-impregnated KTN catalyst showed that the migration of K+from KTN bulk to the surface nitrate salt took place more predominantly than the migration of Na+. Probably for this reason, KNO3-impregnated KTN materials exhibit the best performance for NSR catalytic cycles.