Recent Advances in synthesis and Application of Hierarchical Zeolite

Abstract

Abstract. Constructing hierarchical Zeolite is an important method to enhance accessibility of molecular sieves and the research hotspot in catalytic field. A great number of synthetic methods for adjusting the pore structure of hierarchical molecular sieves were developed. The synthetic researches on hierarchical molecular sieves were reviewed from three different aspects as follows: demetalization, in-situ crystallization and recrystallization. Demetalization mainly included steaming treatment and chemical treatment. In-situ crystallization included hard template and soft template methods. Recrystallization was a method of synthesizing hierarchical molecular sieves，which was obtained by the alkali treatment of zeolite crystal under the existence of surfactants. In addition, the prospect of hierarchical molecular sieves was also outlined.