Single-crystal hierarchical pore hzsm-5 molecular sieve and environment-friendly preparation method thereof

Abstract

The present invention relates to the technical field of molecular sieves, in particular to a single-crystal hierarchical pore HZSM-5 molecular sieve and an environment-friendly preparation method thereof. The environment-friendly preparation method of the single-crystal hierarchical pore HZSM-5 molecular sieve includes the following steps: preparing a sample by a hydrothermal method with nitrogen-free polyketal as a template agent; and conducting acid treatment on the obtained sample to remove the template agent and to obtain the single-crystal hierarchical pore HZSM-5 molecular sieve. A mesopore diameter of the single-crystal hierarchical pore HZSM-5 molecular sieve is concentrated at 10 to 40 nm, a crystal grain size thereof is 30 to 500 nm, a specific surface area thereof is 360 to 450 m/g, and a pore volume thereof is 0.32 to 0.42 cm/g. The present application can not only solve the problems such as collapse of a molecular sieve structure caused by high-temperature roasting, emission of harmful gases and non-recyclability of the template agent, but also can shorten a preparation process of the HZSM-5 molecular sieve and reduce energy consumption and material consumption of the process; and the synthesized HZSM-5 molecular sieve has single-crystal hierarchical pores, and has the advantages of hydrothermal stability, high specific surface area, high pore volume and the like.