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Examining the molecular entanglement between VO complexes and their matrices in atmospheric residues by ESR

机译：用ESR研究VO络合物及其基质在大气残留物中的分子缠结。

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摘要

The VO complexes in atmospheric residues (ARs) and their maltene, resin and asphaltene fractions have been investigated using ESR to examine the effects of the surrounding matrices, measurement temperature, pre-heat-treatment of AR as well as addition of toluene on the electron structure and mobility of the VO ion. The B parameter calculated on the basis of the ESR spectrum has been found to be a good index to reflect the molecular entanglement between the VO complexes and their matrixes in ARs and their fractions, and to indicate the effects of the measurement temperature, pre-heat-treatment as well as the solvent on such interactions. The B parameter value for the VO complexes decreases in the order of asphaltenes > AR ≈ resins > maltenes, implying that the constraint on the mobility of the VO complexes in the samples decreases in the same trend. Increasing temperature, pre-heat-treatment and the addition of toluene reduce the B parameter value, thus, favoring the mobility of the VO complexes in the ARs and their fractions. It can be ascribed to the change in the peripheral environment of the VO complexes surrounded by the matrix molecules. A comprehensive understanding of such molecular entanglement between the VO complexes and their matrixes in ARs may give some important hints to improve the hydrodemetallization performance of AR.
机译：使用ESR研究了大气残留物（ARs）中的VO配合物及其麦芽，树脂和沥青质馏分，以检查周围基质，测量温度，AR的预处理以及在电子上添加甲苯的影响。 VO离子的结构和迁移率。已经发现基于ESR谱计算的 B 参数是反映VO配合物及其在ARs中的组分及其级分之间的分子缠结并表明其影响的良好指标。测量温度，预热处理以及溶剂之间的这种相互作用。 VO配合物的 B 参数值按沥青质> AR≈树脂>马尔滕的顺序降低，这意味着样品中VO配合物迁移率的限制以相同的趋势降低。升高温度，进行预处理和添加甲苯会降低 B 参数值，从而有利于VO复合物在AR及其级分中的迁移。这可以归因于被基质分子包围的VO配合物的周围环境的变化。全面了解AR中VO配合物及其基质之间的这种分子缠结可能会为提高AR的加氢脱金属性能提供一些重要提示。

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