Low-temperature catalytic oxidation of CO over highly active mesoporous Pd/CeO2–ZrO2–Al2O3 catalyst
Low-temperature catalytic oxidation of CO over highly active mesoporous Pd/CeO2–ZrO2–Al2O3 catalyst
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DOI：
10.1039/c6ra05193f
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发表时间：
2016-04
期刊：
影响因子：
3.9
通讯作者：
Xin Liu;P. Ning;Lisi Xu;Q. Liu;Zhongxian Song;Qiulin Zhang
中科院分区：
文献类型：
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作者：
Xin Liu;P. Ning;Lisi Xu;Q. Liu;Zhongxian Song;Qiulin Zhang
采用软模板辅助水热法制备了介孔纳米Pd/CeO2、Pd/CeO2-ZrO2和Pd/CeO2-ZrO2-Al_2O_3催化剂，并将其用于CO低温催化氧化。在60℃时，Pd/CeO_2-ZrO_2-Al_2O_3催化剂的CO转化率几乎为100%。在Pd/CeO_2中加入Zr和Al后，Pd/CeO_2催化剂的孔体积、中孔平均尺寸、表面Ce~(3+)/Ce4+原子比和O/O晶格均增大，活化能按Pd/CeO_2(50.4kJ·−~(1))>；Pd/CeO_2-ZrO_2(40.7kJ·−~(1))>；Pd/CeO_2-ZrO_3(32.4kJ·mol·−~(1))的顺序减小。低温CO催化转化率随反应活化能的降低而增加。
Mesoporous nano Pd/CeO2, Pd/CeO2–ZrO2 and Pd/CeO2–ZrO2–Al2O3 catalysts were prepared via a soft template-assisted hydrothermal method and employed in low-temperature catalytic CO oxidation. Almost 100% of CO conversion could be obtained by the optimal Pd/CeO2–ZrO2–Al2O3 catalyst at 60 °C. Addition of Zr and Al into Pd/CeO2 lead to an increase of the pore volume, average size of mesopores, the surface Ce3+/Ce4+ atomic ratios and Oadsorbed/Olattice, while the activation energy (Ea) decreased in the order Pd/CeO2 (50.4 kJ mol−1) > Pd/CeO2–ZrO2 (40.7 kJ mol−1) > Pd/CeO2–ZrO2–Al2O3 (32.4 kJ mol−1). The low-temperature CO catalytic conversion increased with the decreased activation energy (Ea).