Citation: Qing Hu Zeng, Xiang Bai, Jia Jun Zheng, Jia Qi Chen, Rui Feng Li. Growth of ZSM-5 crystals within hollow β-zeolite[J]. Chinese Chemical Letters, ;2011, 22(9): 1103-1106. doi: 10.1016/j.cclet.2011.04.006 shu

Growth of ZSM-5 crystals within hollow β-zeolite

Key Laboratory of Coal Science and Technology MOE, Taiyuan University of Technology, Taiyuan 030024, China

Received Date: 27 December 2010

Fund Project: This work is supported by the "973" project (No.2005CB221204) and SinoPEC (No.107009).

A zeolite composite composed of ZSM-5 and β-zeolites has been synthesized by a procedure of the nucleation and crystallization of ZSM-5 zeolite in the hollow β-zeolite. The property of β-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 of β-zeolite crystals during the second-step synthesis leads to a preferential dissolution of the aluminum-poor center and the formation of hollow β-zeolite crystals. ZSM-5 zeolite crystals are therefore embedded and grown within the hollow β-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.
- ZSM-5,
- β-Zeolite,
- Zeolite composite
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