关键词: HY /MCM - 4 1,    ,  , 复合分子筛,    ,  , 吸附脱硫,   ,  , 硫容量

Abstract: HY/MCM41 mesomicroporous composite materials composed of a core of HY zeolite and a thin layer of MCM41 have been synthesized by the overgrown crystallization. The samples were characterized by means of Xray diffraction (XRD), N2 adsorptiondesorption, scanning electron microscope (SEM), transmission electron microscope (TEM), Pyridine in situ infrared (PyIR) and Intelligent Gravimetric Analyzer (IGA) instruments. It was found that the composite material exhibited both properties of mesoporous MCM41 and microporous HYzeolite sieves. Adsorptive desulfurization performances of Ce ion supported over the synthesized composites as a sulfur adsorbent were evaluated. It was found that when the adsorbent was prepared by a solidstate grinding method with sulfur capacity of 1.81 mg/g can be obtained. While for the liquid ion exchange method, only 1.32 mg/g sulfur capacity can be reached. Through the batch methods it is found that for the former modified adsorbents the desulfurization degree can be reached to 90.6% while the latter only 81.2%. It also can be found that the Brnsted (B) acid of the adsorbent inhibited the adsorption desulfurization whereas the Lewis (L) acid, especially weak L acid, had a positive effecton adsorption desulfurization.

Key words: HY/MCM41,    ,  Composite molecular sieve,    , Adsorptive desulfurization,    ,  Sulfur capacity