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This is to certify that your paper entitled «The conceptual framework for the Investigation of Catalyst Performance on Desulfurization in a Minirefinery» was indexed with 11 pages, in the CIVILICA citation database, code COI:OGPC04_135, after evaluation and approval of the referees of the "4th Biennial Oil, Gas, and Petrochemical Conference|OGPC| held in Bushehr 2022.

While offering our congratulations on the indexation of your paper, please be informed that this certificate is prepared based on the information submitted by the secretariat of the above conference and the information contained in the CIVILICA database, and the accuracy of its content can be inquired at any time through link provided at the bottom of the page or scanning the code image.