The Synthesis of Different Series of Cobalt BEA Zeolite Catalysts by Post-Synthesis Methods and Their Characterization

Three series of zeolite catalysts Co all-silica and Co Al-containing zeolites beta were prepared for use in the selective oxidative dehydrogenation of propane to propylene. Two series of zeolite catalysts Co all-silica were prepared by a two-step postsynthesis method at pH = 2.5 and pH = 3.0–9.0, re...

Full description

Saved in:
Bibliographic Details
Published in:Catalysts 2022-12, Vol.12 (12), p.1644
Main Authors: Sadek, Renata, Chalupka-Spiewak, Karolina, Krafft, Jean-Marc, Millot, Yannick, Valentin, Laetitia, Casale, Sandra, Gurgul, Jacek, Dzwigaj, Stanislaw
Format: Article
Language:English
Subjects:
Agreements
Aluminum
Analysis
BEA
Catalysis
Catalysts
Chemical reactions
Chemical Sciences
Chemical synthesis
Cobalt
Dehydrogenation
Lewis acid
Material chemistry
Methods
NMR
Nuclear magnetic resonance
ODH
propane
Propylene
Silicon dioxide
zeolite
Zeolites
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Three series of zeolite catalysts Co all-silica and Co Al-containing zeolites beta were prepared for use in the selective oxidative dehydrogenation of propane to propylene. Two series of zeolite catalysts Co all-silica were prepared by a two-step postsynthesis method at pH = 2.5 and pH = 3.0–9.0, respectively, which allows the incorporation of cobalt into SiBEA zeolite in the form of isolated framework pseudo-tetrahedral Co(II) species. The incorporation of Co ions into vacant T-atom sites and their reaction with silanol groups were demonstrated by NMR and FTIR methods. The generation of Lewis acid sites without the formation of Brønsted sites was proved by FTIR using pyridine and CO as probe molecules. The state of cobalt in three series of prepared and calcined zeolite catalysts was characterized by DR UV-vis. This technique allowed to show that for low Co content (2 wt.%), both framework pseudo-tetrahedral and extra-framework octahedral Co(II) species are present. The Co Al-containing zeolite beta series prepared on non-dealuminated support shows the presence of extra-framework octahedral Co(II) only.
ISSN:2073-4344
2073-4344
DOI:10.3390/catal12121644