Unique crystallization behavior in zeolite synthesis under external high pressures.

The function of pressure has long been overlooked in the hydrothermal synthesis of zeolites, which is typically carried out under an autogenous pressure (below 2 MPa). We herein report, the first of its kind, a detailed investigation on the hydrothermal synthesis of zeolites under external high pressures, where crystallization behaviors contradicting the common observations were generated.