Controlled reduction of aromaticity of alkylated polyaromatic compounds by selective oxidation using H<sub>2</sub>WO<sub>4</sub>, H<sub>3</sub>PO<sub>4</sub> and H<sub>2</sub>O<sub>2</sub>: a route for upgrading heavy oil fractions
作者:Ewa Nowicka、Meenakshisundaram Sankar、Robert L. Jenkins、David W. Knight、David J. Willock、Graham J. Hutchings、Manuel Francisco、Stuart H. Taylor
DOI:10.1039/d1nj01986d
日期:——
H2O2 oxidant is applied to the selective oxidation of PAHs containing different lengths of substituent alkylated chain, and different numbers of rings in the fused aromatic core. For a model substrate of 2-ethylnaphthalene, using traditional organic solvents, aliphatic carbon was oxidized more readily compared to aromatic carbon. However, it was found that the oxidation to desired products can be specifically
形成分馏残余物的重质原油馏分占当前烃储量的很大一部分。然而,用作化学品或燃料的加工残留物受到该材料高多芳烃含量的阻碍。通过有针对性的开环和保留烷基化链侧基来选择性降低芳香性是将烷基化多环芳烃 (PAH) 升级为更容易加工和更高价值的分子的关键要求。在本研究中,H 2 WO 4催化剂与 H 3 PO 4和 H 2 O 2 结合氧化剂用于选择性氧化含有不同长度取代基烷基化链和稠合芳核中不同环数的多环芳烃。对于 2-乙基萘的模型底物,使用传统有机溶剂,与芳族碳相比,脂肪族碳更容易被氧化。然而,发现氧化成所需产物可以特别控制,因为选择性受溶剂选择的指导,在乙腈中进行的反应仅在分子的芳族区域进行氧化。对于较大的聚芳烃分子,双相溶剂系统与 Aliquat 336 一起用作相转移剂。即使对于这种更复杂的反应体系,也获得了向相应烷基化开环化合物的高转化率。