Zeolite ceramics with ordered microporous structure and high crystallinity prepared by cold sintering process

Abstract

Abstract4A [Na96(Al96Si96O384)⋅216H2O] and 13X [Na2(Al2Si3.3O10.6)⋅7H2O] zeolite ceramics were prepared by cold sintering processes, and the physical properties were investigated together with the structure characterization. There were four primary parameters controlling the preparation process: content of NaOH, pressure, temperature, and holding time. Zeolite ceramics with the idea ordered microporous structure and high crystallinity were obtained at 393 K under 450~550 MPa with a holding time of 5 min from the solution with 20 wt% NaOH. A high compressive strength up to 60 MPa and low Young's modulus down to 76 MPa were achieved in 13X zeolite ceramics, and the present ceramics might provide potential applications in damping materials and thermal insulating materials.