Abstract
In order to investigate the effect of ion-exchanged metals on the yield and composition of coal tar, we have pyrolyzed raw and calcium-exchanged Yallourn brown coal in a fluidized bed reactor at temperatures of 600 to 1000°C and have analyzed the product tars by Fourier transform infrared (FTIR) spectroscopy. At the lower temperatures (600-800°C), tar yields are lower for the calcium form coal than for the raw coal, indicating that the calcium either promotes tar conversion to char or tightens the coal structure and makes it difficult for larger tar molecules to escape
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