Platelike MFI Crystals with Controlled Crystal Faces Aspect Ratio - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of the American Chemical Society Année : 2021

Platelike MFI Crystals with Controlled Crystal Faces Aspect Ratio

Weijiong Dai
  • Fonction : Auteur
Cassandre Kouvatas
Wenshu Tai
  • Fonction : Auteur
Guangjun Wu
  • Fonction : Auteur
Naijia Guan
  • Fonction : Auteur
Landong Li

Résumé

Zeolite crystals offering a short diffusion pathway through the pore network are highly desired for a number of catalytic and molecule separation applications. Herein, we develop a simple synthetic strategy toward reducing the thickness along b-axis of MFI-type crystals, thus providing a short diffusion path along the straight channel. Our approach combines preliminary aging and a fluoride-assisted low-temperature crystallization. The synthesized MFI crystals are in the micron-size range along a-and c-axis, while the thickness along the b-axis is a few tens of nanometers. The synthesis parameters controlling the formation of plate-like zeolite are studied, and the factors controlling the zeolite growth identified. The synthesis strategy works equally well with all-silica MFI (silicalite-1) and its Al-and Ga-containing derivatives. The catalytic activity of plate-like ZSM-5 in the methanol-to-hydrocarbons (MTH) reaction is compared with a commercial nano-sized ZSM-5 sample, as the plate-like ZSM-5 exhibits a substantially extended lifetime. The synthesis of plate-like MFI crystals is successfully scaled up to a kilogram scale.

Domaines

Chimie
Fichier principal
Vignette du fichier
237-receive comments.pdf (1.94 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03418575 , version 1 (07-11-2021)

Identifiants

Citer

Weijiong Dai, Cassandre Kouvatas, Wenshu Tai, Guangjun Wu, Naijia Guan, et al.. Platelike MFI Crystals with Controlled Crystal Faces Aspect Ratio. Journal of the American Chemical Society, 2021, 143 (4), pp.1993-2004. ⟨10.1021/jacs.0c11784⟩. ⟨hal-03418575⟩
40 Consultations
311 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More