Abstract
Effect of KOH, reaction temperature and time, and introduced carbonization step on the amount and composition of syngas as well as porous properties of the carbon products for CO2gasification of coconut shell at low temperatures (300–700°C) was investigated. Results showed that the presence of potassium hydroxide and gasification temperature had a significant effect on the amount and composition of syngas product and facilitated the rate of hydrogen and carbon monoxide formation. It was also found that carbonization step could promote the generation of hydrogen gas as well as increasing the gas heating value per kg of gas. Furthermore, the porosity development of carbon product was found to be influenced by the chemical ratio and gasification temperature. The optimal conditions for achieving high hydrogen composition and specific surface area were to gasify coconut shell under CO2at 600°C for 60 min with carbonization step and with chemical weight ratio of 3.0. This condition gave the hydrogen composition as high as 29.70 %weight of produced syngas with heating value of 41.4 MJ/kg of gas and specific surface area of 2650 m2/g of the carbon product.
Highlights
The instability of price and supply of fossil fuels has necessitated the need for increasing utilization and development of alternative energy
Obtained by using only potassium hydroxide at the chemical ratio of 0.75 in the atmosphere of argon at the temperature of 600∘C for 180 min is just 8% lower than the activated carbon from the combined use of potassium hydroxide and carbon dioxide at the same chemical ratio. These results indicate that the development of porosity in activated carbon from the coconut shell at this low gasification temperature is mainly caused by the action of the chemical agent
When incorporating the carbonization step by heating the biomass in argon prior to gasification, the results showed a significant increase in the solid yield and a slight decrease in the porous properties of the activated carbon from the gasification process by using potassium hydroxide and carbon dioxide at a gasification
Summary
The instability of price and supply of fossil fuels has necessitated the need for increasing utilization and development of alternative energy. International Journal of Chemical Engineering process can be achieved in a variety of gasifiers: fixed bed gasifiers [5], fluidized bed gasifiers [6], and spouted bed gasifiers [7] These technologies are always operable at a high temperature and pressure with the purpose to enhance the gasification performance [8]. Potassium hydroxide and carbon dioxide gas were employed as a catalyst and gasification oxidizing agent, respectively. The use of combined potassium hydroxide and carbon dioxide for the gasification of coconut shell to produce a high heat content gas fuel and a high porosity carbon adsorbent was the main objective of this work
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