Hollow STW-Type Zeolite Single Crystals with Aluminum Gradient for Highly-Selective Production of p-Xylene from Methanol-Toluene Alkylation - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Angewandte Chemie Année : 2023

Hollow STW-Type Zeolite Single Crystals with Aluminum Gradient for Highly-Selective Production of p-Xylene from Methanol-Toluene Alkylation

Feng Jiao
  • Fonction : Auteur
Hao Li
  • Fonction : Auteur
Qing Hu
  • Fonction : Auteur
Yanan Xu
  • Fonction : Auteur
Svetlana Mintova
Hailing Guo
Hongbin Du

Résumé

Zeolites with uniform micropores are important shape-selective catalysts. However, the external acid sites of zeolites have a negative impact on shape-selective catalysis, and the microporosity may lead to serious diffusion limitation. Herein, we report on the direct synthesis of hierarchical hollow STW-type zeolite single crystals with a siliceous exterior. In an alkalinous fluoride medium, the nucleation of highly siliceous STW zeolites takes place first, and the nanocrystals are preferentially aligned on the outer surface of the gel agglomerates to grow into single crystalline shells upon crystallization. The lagged crystallization of the internal Al-rich amorphous gels onto the inner surface of nanocrystalline zeolite shells leads to the formation of hollow cavities in the core of the zeolite crystals. The hollow zeolite single crystals possess a low-to-high aluminum gradient from the surface to the core, resulting in an intrinsic inert external surface, and exhibit superior catalytic performance in toluene methylation reactions
Fichier principal
Vignette du fichier
357.pdf (774.85 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-04285819 , version 1 (14-11-2023)

Identifiants

Citer

Feng Jiao, Pengyao Yu, Yuchen Cui, Hao Li, Qing Hu, et al.. Hollow STW-Type Zeolite Single Crystals with Aluminum Gradient for Highly-Selective Production of p-Xylene from Methanol-Toluene Alkylation. Angewandte Chemie, 2023, 135 (41), pp.e202310419. ⟨10.1002/ange.202310419⟩. ⟨hal-04285819⟩
6 Consultations
3 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More