Abstract Hydrogen energy is a familiar form of green energy, which is gaining significance in automotive applications due to its unique properties and eco-friendliness compared to fossil fuels. Hydrogen energy is extracted from waste biomass, including algae, textile, and sewage wastewater, through a gasification process, which is effective and suitable for large-scale applications. However, this technique is limited due to a lack of carbon capture, variation in syngas production, and a lack of hydrogen selectivity. This research aims to resolve disputes and enhance hydrogen syngas production, increase hydrogen selectivity, and mitigate carbon capture behaviour during the extraction of hydrogen from sewage wastewater through a catalytic gasification process. During the gasification process, the gasification temperature of the gasifier is varied from 600 to 900 °C, with a 30-min residence time, using a 5 % potassium hydroxide (KOH) catalyst to enhance hydrogen selectivity and carbon capture. The effect of gasification temperature on the molar fraction of hydrogen, hydrogen yield, lower heating value (LHV), gasification efficiency, and hydrogen selectivity in the gasification system is evaluated. Gasifier configured with 5 % KOH operated at 900 °C for 30 min was found to have an optimum hydrogen molar fraction (4.2 % CO, 16 % CO 2 , 51 % H 2 , and 17 % CH 4 ), higher hydrogen yield of 21 mol/kg, reduced LHV of 9 MJ/Nm 3 , superior hydrogen selectivity of 21.2 %, and enhanced gasification efficiency of 64 %. Finally, the extracted hydrogen energy is utilized in automotive applications.
Kaliyaperumal et al. (Thu,) studied this question.