Role of Zirconium Counter ions Content in the Secondary Structure of Keggin-type Heteropoly Tungstate for the Solvent-free Glycerol Carbonate Synthesis

Zirconium ions incorporated into the secondary structure of the Keggin type heteropoly tungstate by titration method by varying the zirconium content. The FT-IR, Laser Raman, and XRD analysis of the synthesized catalysts revealed that the incorporation of the zirconium does not affect the primary st...

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Bibliographic Details
Published in:Catalysis letters 2024-08, Vol.154 (8), p.4492-4501
Main Authors: Jagadeeswaraiah, K., Kumar, K. Ranjith, Pattanaik, Piyusha Priyadarsan, Kumar, Ch. Ramesh, Lingaiah, N.
Format: Article
Language:English
Subjects:
acidity
carbonates
Catalysis
catalysts
Chemistry
Chemistry and Materials Science
glycerol
Industrial Chemistry/Chemical Engineering
Organometallic Chemistry
Physical Chemistry
pyridines
qualitative analysis
temperature
titration
urea
zirconium
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Summary:Zirconium ions incorporated into the secondary structure of the Keggin type heteropoly tungstate by titration method by varying the zirconium content. The FT-IR, Laser Raman, and XRD analysis of the synthesized catalysts revealed that the incorporation of the zirconium does not affect the primary structure of the Keggin ion. The quantitative acid measurement of the catalysts was done by TPD-NH 3 technique. The type of acid site was identified by adsorbing pyridine on the catalyst and qualitative analysis was carried out by DRIFTS. The activity of the catalysts was tested for the glycerol carbonylation using urea as a CO source. The catalyst with moderate content of Zr 4+ ions in the secondary structure presented high activity. Catalysts acidity and activity depend on the intact primary Keggin heteropoly tungstate together with the counter ions type and its size in the secondary structure and catalyst calcination temperature. Graphical Abstract
ISSN:1011-372X
1572-879X
DOI:10.1007/s10562-024-04682-2