Synthesis of a Novel Zeolite through a Pressure‐Induced Reconstructive Phase Transition Process

Abstract

The first pressure-induced solid-phase synthesis of a zeolite has been found through compression of a common zeolite, ITQ-29 (see scheme, Si yellow, O red). The new microporous structure, ITQ-50, has a unique structure and improved performance for propene/propane separation with respect the parent material ITQ-29.

Synthesis of new zeolite structures

“…More recently, an interesting 3D-3D reconstructive transformation of zeolite through the effect of pressure has been shown, and a new zeolite ITQ-50 (IFY) was produced from the pure silica zeolite ITQ-29 (LTA). 102 directions. Fig.…”

Topology reconstruction from FAU to MWW structure

“…The chemical shift of 27 Al was referenced to 1 M aqueous Al(NO 3 ) 3 . 27 Al NMR spectra were recorded by using a pulse length of 0.9 ls and a recycle delay of 2 s. 13 C CP/MAS NMR experiments were performed on a Bruker AVANCE III 600WB spectrometer at a resonance frequency of 150.9 MHz using a 4 mm double-resonance MAS probe at a sample spinning rate of 7.5 kHz. The chemical shift of 13 C was determined using a solid external reference, hexamethylbenzene (HMB).…”

“…The chemical shift of 13 C was determined using a solid external reference, hexamethylbenzene (HMB). 13 C CP/MAS NMR spectra were recorded by using a recycle delay of 5 s and a contact time of 2 ms.…”

“…Corma's group reported that high-pressure (gigapascals) induced reconstructive phase transition process from ITQ-29 to ITQ-50 [13], which was called ''order to order'' transformation. However, the high-pressure device and pressure-transmitting medium limit the potential usage on large scale.…”

“…13 C MAS NMR spectra of as-synthesized samples obtained from the topology reconstruction of FAU structure at various crystallization time.…”