Publication Type Journal Article
Title From powder to extrudate zeolite-based bifunctional hydroisomerization catalysts: on preserving zeolite integrity and optimizing Pt location
Authors Pedro S. F. Mendes J M Silva Filipa Ribeiro Antoine Daudin Christophe Bouchy
Groups FM Chem4Env
Journal JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
Year 2018
Month June
Volume 62
Number
Pages 72-83
Abstract The development of zeolite-based hydroisomerization catalysts in the powder form is widely spread in scientific literature but shaped bodies are the ones being employed in industry. This work aims at bridging that gap. The shaping procedure for HUSY zeolite in presence of an alumina binder disclosed herein achieved a full conservation of zeolite properties, e.g. porosity and Brensted acidity. When Pt was located inside the zeolite and an homogeneous Pt distribution along the extrudate was ensured, shaped Pt-containing catalysts had similar hydroisomerization performances to those of powder Pt/zeolite in terms of turnover frequency per Brensted acid site and maximal feed isomers yield. Conversely, non-uniform distribution of Pt along the extrudates diameter (millimetric scale) was observed to reduce the feed isomers yield. This was tentatively explained by the lower local metal to acid sites ratio in the core of the extrudates. Optimal performance of shaped bifunctional catalysts requires, hence, an adequate metal to acid sites ratio throughout the whole catalyst (i.e. at millimetric and nanometric scale), even if full intimacy between catalytic functions is ensured at the nanoscale by the selective deposition of Pt inside the zeolite. (C) 2017 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
DOI http://dx.doi.org/10.1016/j.jiec.2017.12.046
ISBN
Publisher
Book Title
ISSN 1226-086X
EISSN 1876-794X
Conference Name
Bibtex ID ISI:000431939700008
Observations
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