Department of Petroleum Chemical Engineering, School of Petroleum Chemical Engineering, Liaoning Shihua University, Fushun 113001, PR China.
Ultrason Sonochem. 2011 Jan;18(1):264-8. doi: 10.1016/j.ultsonch.2010.06.006. Epub 2010 Jul 1.
The objective of this work was to probe experimentally the characteristics of the use of Fe(2+) or Cu(2+) ions in the ultrasound-assisted oxidation desulfurization (UAODS) of diesel fuels and to develop a model that appropriately represented the mechanism. The influence of metal ions (Fe(2+) or Cu(2+)) on aqueous phase pH values of the UAODS of diesel fuels was investigated. The UAODS proceeded rapidly only within a limited pH range from 1.9 to 2.1. It was observed that the UAODS of diesel fuels fitted pseudo-first-order kinetics under our experimental conditions. In UAODS of diesel fuels the apparent reaction rate constants can be greatly enhanced by addition of metal ions and/or using ultrasound. The combination of ultrasound and the metal ions can also reduce the apparent activation energy rapidly. The order of the apparent reaction rate constants in UAODS of diesel fuels is US-Fe(2+)-H(2)O(2) system>US-Cu(2+)-H(2)O(2) system>US-H(2)O(2) system>H(2)O(2) system.
本工作旨在通过实验探究 Fe(2+)或 Cu(2+)离子在超声辅助氧化脱硫（UAODS）柴油燃料中的应用特性，并建立合适的反应机制模型。考察了金属离子（Fe(2+)或 Cu(2+)）对柴油燃料超声辅助氧化脱硫水相 pH 值的影响。实验结果表明，UAODS 仅在 1.9 到 2.1 的有限 pH 值范围内快速进行。在实验条件下，柴油燃料的 UAODS 符合准一级动力学。添加金属离子和/或使用超声可以显著提高 UAODS 中柴油燃料的表观反应速率常数。超声和金属离子的结合也可以迅速降低表观活化能。在柴油燃料的 UAODS 中，表观反应速率常数的顺序为 US-Fe(2+)-H(2)O(2)体系>US-Cu(2+)-H(2)O(2)体系>US-H(2)O(2)体系>H(2)O(2)体系。
