Oxidative Desulfurization Of Diesel Catalyzed By Supported Catalysts

As we all know, oil is one of the most important resources in the word. Oil and its products have been widely used in various fields. A substantial proportion of the oil is used as fuel. But as fuel, the oil is usually accompanied with a variety of pollution. The sulfur compounds in the oil will turn into SOx after combustion. The SOx emitted into atmosphere will cause air pollution and do harm to human health. Therefore, deep desulfurization of oil is a very important and urgent work.In oxidative desulfurization, the catalyst is the focus of research. Especially, the catalytic ability and reusability are the important properties of the catalyst. The selenium nuclear peroxotungstate prepared by our group is a catalyst with high selectivity and high catalytic activity. However, it cannot be reused after reaction, which limits its wide application. Therefore, in order to improve the reusability of the catalyst, this paper prepared the supported catalysts used in oxidative desulfurization and investigated its reusability.The molecular sieve with pore structure and more stable, is an ideal catalyst carrier. Therefore, in this article, to prepare supported catalysts, the peroxotungstate was loaded on the MCM-41 materials by the method of wet impregnation. The supported catalysts were characterized with FT-IR, XRD, BET, and TEM. The results show that the catalyst is dispersed well on the MCM-41, indicating the success of loading. As the polycyclic thiophene substances is difficult to remove by HDS, so this paper uses octane solution containing DBT as model oil samples for experiment. A series of catalyst oxidation desulfurization experiments were carried out in model oil samples. The results show that both the supported and the non-supported catalysts have high catalytic performance. Besides, the reaction temperature, the [O]/[S] ratio, the dosage of catalyst etc. were studied in this work. Compared with other catalysts, at similar desulfurization rate, the reaction conditions of the supported catalyst are milder and the dosage of catalyst used are less. Therefore, this catalyst is a more efficient catalyst. Based on the relevant literature, we also proposed a possible catalytic oxidation mechanism for the catalyst. The conversion of DBT was still 90% after 4 rounds of use. It shows that this catalyst have good reusability.In order to study the performance of supported catalyst in FCC diesel. The reaction temperature, the [O]/[S] ratio, the dosage of catalyst and the test of reusability were investigated in the desulfurization of FCC diesel. The results show that the performance of supported catalyst is remarkable in FCC diesel desulfurization. The supported catalyst is a high effective and reusable catalyst and it has a broad application prospect in industry in the future.