期刊
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
卷 62, 期 -, 页码 72-83出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jiec.2017.12.046
关键词
Hydrolsomerization; Zeolite shaping; HUSY; Metal-acid balance; Metal-acid intimacy
资金
- Fundacao pars a Ciencia e Tecnologia through CQE [UID/QUI/00100/2013]
- Fundacao pars a Ciencia e Tecnologia [SFRH/BD/87927/2012]
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.
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