Abstract
Abstract The yield of tar and syngas has been investigated by catalytic pyrolysis of Pingzhuang lignite (PZL) over Ca(OH) 2 catalyst in temperature range of 600 °C-1000 °C in a tube furnace. The results show that the yield of volatile pyrolysis increases and char decreases with rising temperature for both raw and catalyzed Pingzhuang lignite. The hydrogen fraction (H 2 ) increased from 20% to 40% for the PZL sample; but, for the PZL-Ca(OH) 2 sample, H 2 fraction fluctuated randomly between 35 to 42%, with the maximum H 2 fraction found at 1000 °C. The Gas-chromatography mass-spectroscopic (GC-MS) analysis revealed that the maximum tar yield at 800 °C and 700 °C was obtained for PZL and PZL-Ca(OH) 2 , respectively. The surface morphology of PZL and PZL-Ca(OH) 2 chars underwent different transformation in the presence of catalyst as illustrated by SEM/EDX, FTIR, and BET analysis. Furthermore, char sample was investigated for the carbon conversion and reactivity index using TGA analysis under N 2 and CO atmosphere.
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