With the issues of increasingly stringent legislations on sulfur level in transportation fuels, clean fuels research including desulfurization has become a more important subject of environmental catalysis Studies. Oxidative desulfurization (ODS) combined with extraction is one of the most promising desulfurization processes. With the loading of Cs2.5H0.5PW12O40, a new multi-walled carbon nanotube (MWNT) supported catalyst (Cs2.5H0.5PW12O40/MWNT) has been developed in this study. Through experimental evaluations, Cs2.5H0.5PW12O40/MWNT was found to be very effective for the oxidative removal of DBT, with a desulfurization efficiency of up to 100%. Factors affecting the process, including reaction temperature, O/S molar ratio, initial sulfur content, catalyst dosage, and pre-immersion time of the catalyst in H2O2 solution, were evaluated, and the favourable operating conditions were determined. Sulfone species was confirmed by GC-MS analysis to be the only product from DBT oxidation by H2O2 in the presence Of Cs2.5H0.5PW12O40/MWNT after 160 min. Moreover, the new catalyst developed is recoverable. The recovered Cs2.5H0.5PW12O40/MWNT demonstrates quite close catalytic activity to that of the fresh. As a whole, Cs2.5H0.5PW12O40/MWNT has a high potential for using as an effective catalyst for deep desulfurization of diesel. (C) 2009 Elsevier B.V. All rights reserved.