Pd/Hβ-zeolite catalysts for catalytic combustion of toluene: Effect of SiO2/Al2O3 ratio |
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作者单位: | Zekai Zhang,Zhanlong Wan,Yujuan Xu,Yinfei Chen(College of Chemical Engineering and Materials Science,Zhejiang University of Technology,Hangzhou 310014,Zhejiang,China);Longya Xu(Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China,) |
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摘 要: | The effect of pure and high silica Hβ zeolites on the catalytic performance of toluene combustion over Pd/H/3 catalyst was evaluated.Pure and high silica β zeolites were prepared by direct synthesis procedures,then 0.1 wt% of palladium was impregnated on different Hβ zeolites via incipient wetness technique using palladium nitrate as the Pd source.The Pd/Hβ catalysts were characterized by XRD,N2 adsorption/desorption,H2O adsorption,NH3-TPD,H2-TPR and XPS techniques.With increasing the SIO2/Al2O3 ratio of β zeolite,the activity of the Pd/Hβ catalysts for toluene combustion increased clearly and the pure silica β zeolite supported Pd catalyst showed the best catalytic activity.The superior catalytic performance of Pd/β catalyst prepared from pure silica β zeolite was attributed to its high hydrophobicity and the preserving ability for PdO active species.
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关 键 词: | 沸石催化剂 催化燃烧 硝酸钯 硅铝比 甲苯 程序升温脱附 Pd催化剂 分子筛负载 |
收稿时间: | 2009-05-20 |
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