Deep Oxidative Desulfurization of Real Diesel Catalyzed by Na₂WO₄ in Ionic Liquid

An effective deep oxidative desulfurization process, catalyzed by Na₂WO₄ and ionic liquid, was developed for real diesel prehydrotreated. A lower amount of ionic liquid was used, while good catalytic oxidation activity could be obtained under mild conditions. The sulfur content in the real diesel can decrease from the initial 200 to 23.2 ppm after the oxidative desulfurization process, and the sulfur removal rate can reach 88.4%. The catalytic system can be recycled directly after vacuum drying, and there is no obvious change on catalytic activity after recycling five times.