Synergistic effects of the mixing factor on the kinetics and products obtained by co-pyrolysis of Rosa rubiginosa rosehip seed and husk wastes

RODRIGO TORRES SCIANCALEPORE; DANIELA NASSINI; DANIELA ASENSIO; ANA BOHÉ; ROSA RODRÍGUEZ; GASTÓN FOUGA; GERMÁN MAZZA

ENERGY CONSERVATION AND MANAGEMENT

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2024 vol. 302 p. 1 - 16

0196-8904

The aim of this workwas to study the potential synergistic effects of the mixing factor on thekinetics parameters and products obtained through co-pyrolysis of two wastesfrom Rosa rubiginosa rosehip, andfurther co-gasification with CO2 of the remaining biochar. Thermogravimetricanalysis showed that 6 different processes occur by slow pyrolysis (heatingrates of 5, 10, and 20 °C/min), associated with the decomposition ofhemicelluloses, cellulose, lignin, and CaCO3 from the ashes. Isoconversionalmethods determined activation energies of 84.68–223.42, 230.11–270.85,187.58–303.37, and 400.11–421.71 kJ/mol for hemicellulose, cellulose, lignin,and CaCO3 decomposition, respectively. In most cases, the activationenergy from co-pyrolysis was higher for the blends than for the pure wastes,which means that the blends are less reactive to pyrolysis. Gas and taranalyses showed that the blend with 75 % husk waste and 25 % seedwaste produced the most hydrogen (5.639 mmol/g biomass), while the blend with25 % husk waste and 75 % seed waste produced the most carbon monoxide(3.642 mmol/g biomass). The biochar produced by the blends and pure wastes werethermally treated with CO2 to compare reactivity to gasification. Itwas concluded that the addition of husk waste to the blend increases thereactivity of the biochar obtained, mainly due to its higher ash content.