Hydrogen-rich gaseous products from tea waste by pyrolysis

Hydrogen from solid wastes is produced by pyrolysis. In this study, tea factory waste samples were subjected to direct and catalytic pyrolysis to obtain hydrogen-rich gaseous products at desired temperatures. The samples, both untreated and impregnated with the catalyst, were pyrolyzed at temperatures of 775, 850, 925, 975, and 1025 K. The total volume and the yield of gas from both forms of pyrolysis increase with increasing temperature. The largest hydrogen-rich gas yield obtained from tea waste, using about 13% ZnCl2 as a catalyst at about 1025 K temperature, is 60.3%, respectively. In general, in the pyrolysis of tea waste, the yield of hydrogen-rich gaseous product increases with ZnCl2 catalyst, but the yield of pyrolytic gas decreases in spite of increasing the yield of charcoal and liquid products. The catalytic effect of Na2CO3 was greater than that of K2CO3 for pyrolysis of the tea waste.