二苯并噻吩及其加氢中间体在体相金属磷化物上的加氢脱硫反应.docx

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Title: Hydrogenation and Desulfurization Reactions of Dibenzothiophene and its Hydrogenation Intermediate on Heterogeneous Metal Phosphides
Introduction:
Dibenzothiophene (DBT) and its hydrogenation derivatives play a significant role in the production of clean fuels and chemicals due to their presence in sulfur-containing crude oil fractions. The desulfurization of DBT is one of the most critical steps in the hydrodesulfurization (HDS) process for the upgrading of petroleum, as sulfur compounds are major contributors to air pollution and catalyst poisoning. The use of metal phosphide catalysts in the hydrogenation and desulfurization of DBT and its intermediates has gained attention for their high catalytic activity and selectivity in sulfur removal. This paper aims to review the recent advancements and mechanisms of hydrogenation and desulfurization reactions of DBT and its hydrogenation intermediates on heterogeneous metal phosphides.
Hydrogenation of dibenzothiophene:
The hydrogenation of DBT involves the addition of hydrogen atoms to its aromatic ring, thereby saturating the molecule. The reaction can proceed via the hydrogenation of the aromatic double bonds or the cleavage of carbon-sulfur bonds followed by hydrogenation. Metal phosphides, such as MoP, Ni2P, and Co2P, have shown promising catalytic activity for this reaction. The synergistic effect between metal and phosphorus in these catalysts enhances hydrogen activation, improving the overall hydrogenation efficiency. Several studies have investigated the effect of different parameters, such as temperature, pressure, reactant concentration, and catalyst morphology, on the hydrogenation performance. These investigations have provided insights into the reaction kinetics and optimal reaction conditions for the selective hydrogenation of DBT.
Desulfurization of dibenzothiophene:
Desulfurization is a challenging process due to the high stability of the carbon-sulfur bond in DBT. Metal phosphides have been reported to effectively catalyze the desulfurization of DBT to produce its corresponding hydrodesulfurized product, biphenyl. The desulfurization mechanism involves the adsorption of DBT on the catalyst surface, followed by the cleavage of carbon-sulfur bonds and subsequent hydrogenation. The identification of active sites and the determination of reaction intermediates are crucial for understanding the underlying desulfurization mechanism. Various characterization techniques, such as X-ray photoelectron spectroscopy (XPS), infrared spectroscopy (IR), and density functional theory (DFT) calculations, have been employed for catalyst characterization and mechanistic studies.
Advantages of metal phosphide catalysts:
Heterogeneous metal phosphide catalysts offer several advantages in the hydrogenation and desulfurization reactions of DBT and its intermediates. These advantages include high activity, selectivity, thermal stability, and resistance to catalyst deactivation. The metal-phosphorus bond in these catalysts enhances the adsorption of reactant molecules, promotes hydrogen activation and promotes the transformation of carbon-sulfur bonds. Furthermore, metal phosphides can be synthesized using different methods, allowing for the control of their surface properties, morphology, and metal-phosphorus ratio, thereby tailoring their catalytic performance.
Conclusion:
The hydrogenation and desulfurization reactions of DBT and its hydrogenation intermediates on heterogeneous metal phosphides have attracted significant attention in recent years. Metal phosphides, such as MoP, Ni2P, and Co2P, have shown promising catalytic activity in the selective hydrogenation and desulfurization, contributing to cleaner fuels and reducing environmental pollution. Further research is required to explore the optimization of reaction conditions, catalyst design, and mechanistic understanding in order to enhance the catalytic performance of metal phosphides in this field.