✍ Scribed by A Demirbaş
No coin nor oath required. For personal study only.
Future energy technology will utilize hydrogen with an increasing trend in steady, as well as unsteady, combustion processes. Hydrogen is produced from fossil fuels, hydrocarbon polymers, biomass, and water by electrolysis and from biological process by photoliticaly or thermolysis. Hydrogen is produced from solid waste by pyrolysis. In this study, three different biomass samples were subjected to directand catalytic pyrolysis in order to obtain hydrogen-rich gaseous products at desired temperatures. The samples, both untreated and impregnated with catalyst, were pyrolysed at 770, 925, 975 and 1025 K temperatures. The total volume and the yield of gas from both pyrolysis were found to increase with increasing temperature. The largest hydrogen-rich gas yield were obtained from olive husk, cotton cocoon shell, and tea waste using about 13% ZnCl 2 as catalyst at about 1025 K temperature were 70.3, 59.9, and 60.3%, respectively. In general, in the pyrolysis of biomass, the yield of hydrogen-rich gaseous product increases with ZnCl 2 catalyst, but the yield of pyrolytic gas decreased in spite of increasing the yield of charcoal and liquid products. The effect of K 2 CO 3 and Na 2 CO 3 as catalysts on pyrolysis depends on the biomass species. The catalytic effect of Na 2 CO 3 was greater than that of K 2 CO 3 for the cotton cocoon shell and tea waste, but the catalytic effect of K 2 CO 3 was greater for the olive husk.
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The catalytic pyrolysis of plant biomass was investigated in a dual-particle powder fluidized-bed (PPFB), where the primary decompositions and secondary reactions occurred simultaneously under ambient pressure. The yields and distributions of the pyrolysis products were studied under various operati