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Impact of Pore Connectivity on the Design of Long‐Lived Zeolite Catalysts
Author(s) -
Milina Maria,
Mitchell Sharon,
Cooke David,
Crivelli Paolo,
PérezRamírez Javier
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201410016
Subject(s) - zeolite , catalysis , structuring , porosity , realization (probability) , materials science , positronium , rational design , nanotechnology , methanol , chemical engineering , chemistry , organic chemistry , physics , positron , electron , engineering , composite material , statistics , mathematics , finance , quantum mechanics , economics
Without techniques sensitive to complex pore architectures, synthetic efforts to enhance molecular transport in zeolite and other porous materials through hierarchical structuring lack descriptors for their rational design. The power of positron annihilation lifetime spectroscopy (PALS) to characterize the pore connectivity in hierarchical MFI zeolites is demonstrated, establishing a direct link with the enhanced catalyst lifetime in the conversion of methanol to valuable hydrocarbons. The unique ability to capture subtleties of the hierarchical structure originates from the dynamic nature of the ortho ‐positronium response to the pore network. The findings reveal the strong dependence on the way in which the hierarchical zeolites are manufactured, having direct implications for the practical realization of these advanced catalysts.