In situ visualisation of zeolite anisotropic framework flexibility during catalysis

Author(s)

Rodrigues, Mariana, V ; Vinaches, Paloma ; Polo, Carla C. ; Silva, Marlon M. ; Suzana, Ana F. ; Cha, Wonsuk ; Pergher, Sibele B. ; Rochet, Amelie ; Meneau, Florian

• Document type: Journal article
• Source: CATALYSIS TODAY; v. 446, p. 7-pg., 2024-11-12.

Abstract

Zeolites exhibit framework flexibility driving their chemical and catalytic properties. Since the zeolitic pores are extremely small, a slight strain generated in the crystal induces compelling changes in shape, connectivity, accessibility, and the framework chemical properties. These modifications affected the adsorption and desorption of reactants/products and the diffusion within the channels during reaction. Using in situ 3D Bragg coherent Xray diffraction imaging, we unveil the dynamics of the zeolite structure during catalysis, contraction and/or expansion of its framework also known as zeolite framework flexibility. We imaged three-dimensionally a single faujasite zeolite crystal during the ethanol dehydration reaction revealing anisotropic lattice dynamics simultaneously to guest molecules formation. Understanding zeolite flexibility could permit to tune zeolites properties towards potentially higher adsorption and selectivity. (AU)

• FAPESP's process: 21/06876-1 - Imaging working catalysts/catalytic correlations in nanoporous materials
• Grantee: Florian Edouard Pierre Meneau
• Support Opportunities: Research Grants - Young Investigators Grants - Phase 2
• FAPESP's process: 17/23050-4 - Multi-modal approach probing noble-metal catalysts at work
• Grantee: Amélie Claire Rochet
• Support Opportunities: Research Grants - Young Investigators Grants
• FAPESP's process: 22/13024-4 - Catalytic correlations in nanozeolites investigated by coherent diffraction imaging and x-ray photon correlation spectroscopy
• Grantee: Mariana Veiga Rodrigues
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 19/01474-2 - Multi-User Equipment approved in grant 2017/23050-4: on line gas analyser
• Grantee: Amélie Claire Rochet
• Support Opportunities: Multi-user Equipment Program
• FAPESP's process: 21/11217-7 - Multi-modal approach for active sites visualisation of noble-metal core-shell catalysts
• Grantee: Marlon Muniz da Silva
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)