Perpustakaan Digital ITB

In recent years, a rise in the global average temperature has been observed, primarily attributed to the escalating release of greenhouse gases. Notably, carbon dioxide (CO2) constitutes a significant portion, accounting for approximately 65% of greenhouse gas emissions. The adoption of Carbon Capture, Utilisation, and Storage (CCUS) technology emerges as a promising method for mitigating CO2 emissions. While applying chemical solvents, such as amines, for CO2 capture represents a well-established and industrially employed approach, its drawback lies in the high energy requirements for solvent regeneration and environmental concerns associated with amines. Hence, there is a compelling need to explore alternative methods to curtail CO2 emissions effectively. Numerous studies have indicated that NH4OH and KOH represent viable alternatives to amine solutions, offering superior CO2 absorption capabilities without posing toxicity concerns. This research assesses the potential of these two absorbents through CO2 absorption experiments. The absorbent is introduced into a reactor, where CO2 is subsequently introduced for absorption. Following saturation, a fixation or mineral carbonation process is conducted to precipitate the captured CO2 into solid carbonate minerals. Analysis of the precipitate using X-ray diffractogram (XRD) confirms the successful formation of CaCO3 in both fixation processes involving the absorbent. Quadrupole mass spectrometer (QMS) measurements for KOH indicate a removal efficiency of approximately 40% and a CO2 loading of 0.44. The regenerated KOH solution demonstrates an impressive 86.6% efficiency in the regeneration process, noteworthy for its achievement without the need for additional heat energy. These findings emphasize the considerable potential of both KOH and NH4OH as substitutes for amine-based solvents in CO2 absorption, leading to the production of CaCO3 as a valuable product.