부산대학교 도서관

Synthetic heat transfer fluids are of immense importance for solar thermal application due to its low vapour pressure, low melting point and high heat capacity. Commonly used synthetic heat transfer fluids are biphenyl and diphenyloxide mixture, imidazolium ionic liquid and terphenyl based chemistry. However these fluids are not found effective above 400 °C operating temperatures as they tend to degrade. As per literature inputs polyaromatic based molecules like 1-phenylnaphthalene (1-PNP) and 2-methy-l-phenylnaphthalene have thermal stability above 400 °C. In the present research work a simple, efficient and environmentally benign procedure of Suzuki coupling is employed for the synthesis of these molecules in the presence of ligand free refinery Pd-spent catalyst in water. The catalyst was found to be recyclable up to 3 times without any loss of efficiency. The synthesized polyaromatic based heat transfer fluid molecules in the presence of radical quencher which indicates their potential for high temperature application. Thermal stability of synthesized polyaromatic based heat transferred fluid was enhanced by free radical quencher. So as to apply the fluid for high temperature usage.Graphical Abstract: