Synergetic role of copper-modified phosphotungstic acid supported on titania catalysts for the conversion of bio-glycerol to glycerol carbonate

Copper-modified phosphotungstic acid (CuPW) supported on titania materials with various CuPW contents were successfully synthesized by ion exchange followed by an impregnation method. The prepared materials were characterized using XRD, Raman, ammonia TPD, pyridine FT-IR spectroscopy, and BET-surfac...

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Bibliographic Details
Published in:New journal of chemistry 2023-09, Vol.47 (36), p.16897-1696
Main Authors: Viswanadham, Balaga, Dasireddy, Venkata D. B. C, Putrakumar, Balla
Format: Article
Language:English
Subjects:
Ammonia
Anatase
Carbonyls
Catalysts
Chemical synthesis
Copper
Copper converters
Fourier transforms
Glycerol
Infrared spectroscopy
Ion exchange
Pyridines
Raman spectroscopy
Spectrum analysis
Titanium dioxide
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Summary:Copper-modified phosphotungstic acid (CuPW) supported on titania materials with various CuPW contents were successfully synthesized by ion exchange followed by an impregnation method. The prepared materials were characterized using XRD, Raman, ammonia TPD, pyridine FT-IR spectroscopy, and BET-surface area measurements. The XRD results revealed that the crystalites of Keggin ions of heteropolyacid were merged with the anatase support. The Raman spectroscopy results of the fresh and regenerated 30 wt% CuPW/TiO 2 clearly showed the characteristic peak of Keggin ions being intact with the support. The results from the temperature-programmed desorption (TPD) of ammonia tests revealed that a 30 wt% catalyst possessed a greater number of acidic sites than the other loadings. Pyridine-adsorbed FT-IR spectroscopy suggested that the 30 wt% catalyst calcined at 300 °C had high amount of Lewis and Brønsted acidity. The copper-modified phosphotungstic acid on the titania support significantly altered the Brønsted and Lewis acidity of the catalysts and promoted a remarkable catalytic performance during glycerol carbonylation as well as provided related structural and acidity functionalities to the CuPW/TiO 2 catalyst. An efficent heterogeneous bi-functional Cu-tuned phostotunstic acid reusable catalyst is developed for the selctive carbonylation of biomass-derived glycerol for boosted stable activity and higher selectivity of glycerol carbonate.
ISSN:1144-0546
1369-9261
DOI:10.1039/d3nj02844e