Abstract
CuY zeolite is a promising catalyst in the field of manufacturing dimethyl carbonate (DMC) through oxidative carbonylation of methanol. Cu+ exchanged with Brønsted acid sites are supposed to be active for this reaction. However, the location of Cu+ in small cages can not interact with reactants because of steric hindrance, which lead to a waste of Cu species. In this work, NH4F solution was used to modify the pore structure of zeolite Y by etching the framework T atoms. Physical and chemical adsorption of probe molecules with different size are used to determine the changes of porosity as well as the accessibility of Cu+ sites. At an optimized etching time, the small cages were opened with maintained zeolitic framework. As a result, more Cu+ species located in small cages become accessible to reactants, which contributes to the enhanced activity in this reaction.
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