Study of the pyrolysis of ionic liquid [Bmim]Cl-pretreated mango pit at low temperature

In the present work, mango pit was used to study the feasibility of converting ionic liquid-pretreated biomass into biofuel and activated biochar by using pyrolysis temperature as a key variable. Ionic liquid 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) was used as a green solvent to dissolve mango pit. The impact of [Bmim]Cl on the pyrolysis properties at peak DTG temperature was investigated. Pretreatment with [Bmim]Cl was observed to slightly enhance biochar yield, while somewhat decreasing bio-oil and biogas yields. The yield of hydrogen and methane, as well as the generation of phenolic and alcoholic bio-oils, are increased by [Bmim]Cl pretreatment. [Bmim]Cl pretreatment was determined to promote the formation of pore structure, a greater number of pores were opened, and the BET surface areas increased 24 times. The pyrolysis kinetics were calculated using the DAEM model. The results showed that [Bmim]Cl pretreatment resulted in lower activation energy and a high amount of fraction mass conversion at low temperatures. As a result, the results showed that pyrolysis of [Bmim]Cl-pretreated biomass did not require high temperatures, and that it is possible to convert ionic liquid pretreatment biomass into high-quality biofuel and active biochar by controlling the pyrolysis temperature. Graphical abstract