Characterization of Concentrated Leachate-Activated Char Prepared from Spent Coffee Ground in Slow Pyrolysis DOI Open Access
Ronei de Almeida,

Marcelo Mendes Vianna,

Francesco Lanero

et al.

Published: June 6, 2024

The pyrolysis process has emerged as an attractive option for waste treatment. In this technology, inorganic compounds play catalytic effects in the pyrolytic reaction of organic materials, increa-sing char's yield, porosity, and physicochemical properties. present research investigates compares slow spent coffee grounds (SCG) using potassium hydroxide (KOH) (weight ratio 1:1) landfill leachate membrane concentrate (LLMC) residue pyrolitic additives. We hypothesized that high content alkali alkaline earth metals LLMC could enhance yield or improve quality carbon-based material produced pyrolysis. This strategy be a sustainable alternative valorizing SCG wastes, replacing catalyzing agents such steam, CO2, chemical additives used on industrial scale. char yields ranged from 18 to 24%. had low specific surface area (4.5 m2 g-1), contrasting with notable areas observed both ac-tivated chars. particular, KOH-activated displayed higher than LLMC-activated (1960 vs. 1130 g-1). On other hand, combustion enthalpy was estimated at 22 MJ kg-1. value 22% energy comparison. Our findings confirm KOH produces microporous area. contrast, resulting demonstrates calorific value. contribute establishing potential applications residues produce high-value materials.

Language: Английский

Characterization of Concentrated Leachate-Activated Char Prepared from Spent Coffee Ground in Slow Pyrolysis DOI Open Access
Ronei de Almeida,

Marcelo Mendes Vianna,

Francesco Lanero

et al.

Published: June 6, 2024

The pyrolysis process has emerged as an attractive option for waste treatment. In this technology, inorganic compounds play catalytic effects in the pyrolytic reaction of organic materials, increa-sing char's yield, porosity, and physicochemical properties. present research investigates compares slow spent coffee grounds (SCG) using potassium hydroxide (KOH) (weight ratio 1:1) landfill leachate membrane concentrate (LLMC) residue pyrolitic additives. We hypothesized that high content alkali alkaline earth metals LLMC could enhance yield or improve quality carbon-based material produced pyrolysis. This strategy be a sustainable alternative valorizing SCG wastes, replacing catalyzing agents such steam, CO2, chemical additives used on industrial scale. char yields ranged from 18 to 24%. had low specific surface area (4.5 m2 g-1), contrasting with notable areas observed both ac-tivated chars. particular, KOH-activated displayed higher than LLMC-activated (1960 vs. 1130 g-1). On other hand, combustion enthalpy was estimated at 22 MJ kg-1. value 22% energy comparison. Our findings confirm KOH produces microporous area. contrast, resulting demonstrates calorific value. contribute establishing potential applications residues produce high-value materials.

Language: Английский

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