NO_x storage/reduction over alkali-metal-nitrate impregnated titanate nanobelt catalysts and investigation of alkali metal cation migration using XPS

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• 作者：Akihiro Yoshida ; Weihua Shen ; Tomonori Eda ; Ryo Watanabe ; Tetsu Ito ; Shuichi Naito ; ^{naitos01@kanagawa-u.ac.jp}
• 关键词：NOx storage/reduction (NSR) ; Titanate ; X-ray photoelectron spectroscopy
• 刊名：Catalysis Today
• 出版年：2012
• 期刊代码：13_09205861
• 类别：ce
• 出版时间：30 April, 2012
• 卷：184
• 期：1
• 页码：78-82
• 文件大小：612 K

摘要

We reported earlier that KNO₃- and Pt-impregnated potassium titanate nanobelt (KTN) catalysts exhibit high storage capacity and excellent catalytic cycles for NO_x storage-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.