Petroleum Research Petroleum Research 2019(April-May), Vol. 29, No. 104, 18-20 DOI: 10.22078/pr.2018.3351.2538 Oxidative Desulfurisation of Model Oil and Real Sample Using MoO 3 /g-C 3 N 4 Catalyst and Optimization of Operating Conditions by Box-Benken Method Fatemeh Bibak and Gholamreza Moradi* Catalyst Research Center, Faculty of Petroleum and Petrochemical, Razi University, Kermanshah, Iran Gmoradi@razi.ac.ir DOI: 10.22078/pr.2018.3351.2538 Received: June/08/2018 Accepted: November/14/2018 INTRODUCTION Oil polluon is an undesirable phenomenon with serious and destrucve effects on human health and environment. As sulfur compounds are one of the most important pollutants in the Oil cuts, the removal of these compounds from them is very important due to the producon of SO x gases in the course of combuson, and subsequently, air polluon, acid rain producon, and corrosion of metals [1]. To enhance deep desulfurizaon, the MoO 3 /g- C 3 N 4 was selected as catalyst and H 2 O 2 as an oxidant. The study was carried out on the removal of DBT from model oil. The effects of MoO3 loading, temperature, H 2 O 2 /DBT rao, catalyst weight, and reacon me were invesgated using the Box-Behnken Design (BBD) method in experimental design. Also, the performance of the catalysts was evaluated in the removal of sulfur compounds of gasoline and gas oil at the opmum condions. The MoO 3 /g-C 3 N 4 catalyst was characterized by XRD, EDX, FE-SEM, and BET analyses. EXPERIMENTAL PROCEDURE CATALYST PREPARATION MoO 3 /g-C 3 N 4 was prepared according to the reported procedure [2]. Pure MoO 3 was prepared by directly calcining at 500 °C for 4 h. Pure g-C 3 N 4 powder was prepared by directly calcining melamine powder at 520 °C for 4 h with a heang rate of 10 °C min -1 . Aſter cooling to room temperature, yellow g-C 3 N 4 was obtained in a powder form. The MoO 3 /g-C 3 N 4 composites were prepared by mixing MoO 3 and g-C 3 N 4 and grinding in an agate mortar for 20 min. Then, the mixtures were calcined at 400 °C for 2 h to obtain MoO 3 /g-C 3 N 4 catalysts.