Ultrasonic-pretreated hydrothermal synthesis of less dense zeolite CHA from the transformation of zeolite T.

ABSTRACT: Because of containing the same double 6-ring (D6R) building unit, the pure zeolite CHA with lower framework density (FD_Si = 15.1 T/1000 Å³) has been transformed from zeolite T with higher framework density (FD_Si = 16.1 T/1000 Å³) through ultrasonic-pretreated hydrothermal synthesis in MOH (KOH and NaOH) solution without adding organic template or seed crystals. Ultrasonic pretreatment facilitates the transformation rate and generates high-quality zeolite CHA. The ultrasound condition should be precisely controlled because that CHA phase is metastable, which is inclined to transform to other more stable phase. The ultrasonic conditions at 313 K and 333 K have been investigated in detail. In KOH solution, the ultrasonic treatment at 313 K can effec

SUBMITTER: Yin X 

PROVIDER: S-EPMC10511489 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature