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Citation: Chen Hong-Lin, Shen Bao-Jian, Pan Hui-Fang. Physicochemical and Catalytic Properties of ZSM-5/Y Composite Zeolites Dealuminated by the Steaming[J]. Acta Physico-Chimica Sinica, ;2004, 20(08): 854-859. doi: 10.3866/PKU.WHXB20040814 shu

Physicochemical and Catalytic Properties of ZSM-5/Y Composite Zeolites Dealuminated by the Steaming

1.
State Key Laboratory of Heavy Oil Processing, the Key Laboratory of Catalysis of CNPC, and Faculty of Chemical Engineering, University of Petroleum, Beijing　102249

Received Date: 19 January 2004
Available Online: 15 August 2004

ZSM-5/Y composite zeolite, a new composite material synthesized in situ from NaY gel, was dealuminated by hydrothermal treatment to study the effect of dealumination on physicochemical properties (undertook with XRD, IR spectroscopy, N2 adsorption/desorption) and catalytic activity (in n-hexane cracking). Compared to the mechanical mixtures, Y phases of the composites had better retained crystallinity under steaming at 550 ℃ and 700 ℃.Steaming resulted in the loss of microporosity of the crystalline material but the increase of mesoporous structure (5～30 nm at 550 ℃ and 5～40 nm at 700 ℃).The size of the mesopore distribution of dealuminated composites was larger than the dealuminated mechanical mixtures, but their macro- and mesopore volume was smaller. Quantitative IR studies of pyridine sorption showed Brønsted and Lewis acid sites of the composite after dealuminated at 550 ℃ decreased (mainly the medium strength acid sites).Compared to the hydrogen type zeolite, the catalytic activity of the dealuminated zeolite for n-hexane cracking increased greatly after 550 ℃ dealumination, and then decreased by further dealumination. The analysis of the product distribution showed that the enhanced activity was related to the change of reaction mechanism.
- ZSM-5/Y composite zeolite;Mechanical mixture;Hydrothermal dealumination;Mesopore;Acidity;Catalytic cracking
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