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Valorization of cotton stalks by fast pyrolysis and fixed bed air gasification for syngas production as precursor of second generation biofuels and sustainable agriculture

Kantarelis, E., Zabaniotou, A.
Bioresource technology 2009 v.100 no.2 pp. 942-947
renewable energy sources, biomass, biogas, biofuels, hydrogen, carbon monoxide, carbon dioxide, cotton, plant residues, gasification, sustainable agriculture, heat treatment
In the present study, the potential of cotton stalks utilization for H₂ and syngas production with respect to CO₂ mitigation, by means of thermochemical conversion (pyrolysis and gasification) was investigated. Pyrolysis was conducted at temperature range of 400-760°C and the main parametric study concerned the effect of temperature on pyrolysis product distribution. Atmospheric pressure, air gasification at 750-950°C for various λ (0.02-0.07) was also studied. Experimental results showed that high temperature favors gas production in both processes; while low λ gasification gave high gas yield. Syngas (CO and H₂) was increased with temperature, while CO₂ followed an opposite trend. By pyrolysis, higher H₂ concentration in the produced gas (~39% v/v) was achieved and at the same time lower amounts of CO₂ produced, compared to air gasification.