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Demonstration of Improved Effectiveness Factor of Catalysts Based on Hollow Single Crystal Zeolites
Author(s) -
Pagis Céline,
Meunier Frédéric,
Schuurman Yves,
Tuel Alain,
Dodin Mathias,
MartinezFranco Raquel,
Farrusseng David
Publication year - 2018
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201801225
Subject(s) - zeolite , catalysis , diffusion , materials science , cyclohexene , crystal (programming language) , volume fraction , single crystal , chemical engineering , shell (structure) , chemistry , crystallography , thermodynamics , organic chemistry , composite material , physics , computer science , engineering , programming language
Pt/NaY zeolites with bulk and hollow morphologies have been used as model catalysts in the hydrogenation of cyclohexene as model reaction. In contrast to most hierarchical zeolites, the presence of a single internal cavity modifies only the mean diffusion length, without changing the external surface area and the crystal size. Differences in catalytic activities have been attributed to a shorter diffusion length in hollow crystals. The volume fraction of zeolite used in bulk crystals (ca. 0.63–0.70) matches well with the shell thickness in hollow crystals, leading to an efficiency factor value for the latter close to 1.