| Growth of ZSM-5 crystals within hollow β-zeolite |
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| 作者姓名： | Qing Hu Zeng Xiang Bai Jia Jun Zheng Jia Qi Chen Rui Feng Li |
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| 作者单位： | Key Laboratory of Coal Science and Technology MOE, Taiyuan University of Technology, Taiyuan 030024, China |
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| 基金项目： | supported by the“973”project(No.2005CB221204);SinoPEC(No.107009) |
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| 摘 要： | A zeolite composite composed of ZSM-5 andβ-zeolites has been synthesized by a procedure of the nucleation and crystallization of ZSM-5 zeolite in the hollowβ-zeolite.The property ofβ-zeolite crystals with aluminum-poor interior and aluminum-rich outer rim results in silicon extraction favorably in the aluminum-poor bulk rather than the aluminum-rich external surface.Subsequently,alkaline treatment ofβ-zeolite crystals during the second-step synthesis leads to a preferential dissolution of the aluminum-poor center and the formation of hollowβ-zeolite crystals.ZSM-5 zeolite crystals are therefore embedded and grown within the hollowβ-zeolite.The catalytic activities of Co-Hβ,Co-HZSM-5 and Co-HZSM-5/BEA are investigated during the reaction of methane catalytic reduction NO in the presence of O2.
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| 关 键 词： | ZSM-5 β-Zeolite Zeolite composite |
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