Pyrolysis or partial gasification transforms a portion of the solid coal into gas and liquids

and may possibly generate low sulfur chars for clean combustion. Yanzhou coal was pyrolyzed in a fix-bed reactor from room temperature up to 800℃ with a heating rate of 10℃8226;s-1. The dynamic profile of sulfur emission from coal to gas phase was obtained by TPD-FPD method

and two obvious peaks (at 470℃ and 560℃) were observed. Furthermore

the sulfur compounds in coal and chars were analyzed by XPS and SEM-EDX. It was found that there was a fair amount of thiophenes in Yanzhou raw coal

and under the pyrolysis conditions some thiophenes might come from other sulfur compounds during processing.