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Method for Regenerating Spent Catalyst Used to Produce Sulfuric Acid in the SO2 to SO3 Conversion Step

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Abstract:

Regeneration of industrial catalysts is a better way of increasing the catalytic activity of a catalyst. These catalysts are used in the production of sulfuric acid, in the conversion of sulfur dioxide to sulfur trioxide. They lose their efficiency and activity over time, so it is preferable to regenerate the catalyst instead of discarding it as waste, using a thermal regeneration method followed by chemical treatment by impregnation with different percentages of V2O5, 10%, 20% and 30%. They are then examined using techniques known as XRD and FTIR. The IR spectrum shows that the catalyst doped with 30% V2O5 has the same bands as the fresh catalyst. Finally, the catalytic test carried out by iodometric assay shows that the catalyst regenerated with 20% V2O5 has a conversion rate of 63%, identical to that of fresh catalyst.

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Periodical:

Materials Science Forum (Volume 1173)

Pages:

113-121

DOI:

https://doi.org/10.4028/p-3HWCOc

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Online since:

December 2025

Authors:

Noureddine El Hasbaoui*, Abdelouahab Elhadrami, Rachid Brahmi

Keywords:

Conversion, Imbalance, Impregnation, Regeneration, Spent Catalyst

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© 2025 Trans Tech Publications Ltd. All Rights Reserved

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