The Impact of Hydrothermal and Dilute Acid Pretreatments and Inorganic Metals on Thermal Decomposition of Agricultural Residues and Agricultural Residue Ash Properties
The impacts of hydrothermal and dilute acid pretreatments and alkali and alkaline earth metals (AAEMs) on the thermal degradation of biomass were studied. Besides, the influence of these pretreatments on the biomass ash properties was investigated. The influence of pretreatments on the biomass thermal degradation was manifested in the removal of potassium out of the biomass. The presence of potassium in the biomass catalyzed cellulose thermal degradation and increased the char percentage at temperatures higher than 380 °C. Pretreatments were effective at removing the potassium from biomass and dramatically reduced the char percentage at temperatures higher than 380 °C. It was found that the best burning temperature for biomass ash production was 500 °C because at this temperature the thermal degradation of biomass was completed under pure combustion. It was shown that when burning biomass in oxygen-limited environments, removing AAEMs, particularly potassium, will improve the quality of ash as a potential candidate for supplementary cementitious materials for concrete application.
KeywordsPyrolysis Thermal degradation Agricultural residues Pretreatments
The authors are grateful to Dr. Donn Beighley for providing the rice straw. Antoine Borden’s assistance with the pretreatment experiments is gratefully appreciated.
This study was funded by the National Science Foundation award #: CMMI-103093.
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