Assessment on the Viability of Iron on Carbon Dioxide Capture and Storage Technologies

Author : Maliwat, Ranny Esktrom
Major Adviser : Eusebio, Ramon Christian P.
Committee Members : Gatdula, Kristel M.; Carpio, Rowena B.
Year : 2020
Month : July
Type : Thesis
Degree: (select one) MS/BS/PhD
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Progress in iron carbon capture storage (Fe-CCS) was assessed by enumerating and comparing each study with quantitative product results to infer the viability of iron in CCS and if its comparable to Ca-CCS. The parameters compared were siderite purity, carbonation efficiency (CE) and operating conditions: pressure (operating or pCO2) and temperature. From the listed studies, siderite (SD) purity improved with recent developments in direct carbonation from 83.23 % to 97 %. More potential feeds for Fe-CCS were also tested with red gypsum (RG) providing the highest SD purity of 97 %. For operating conditions, the results of Rahmani (2018) shown promising results wherein SD was synthesized at 1 bar and 150°C which is an improvement as compared to other studies (>10 bar, >150°C). Furthermore, the reaction time of Rahmani (2018) at 1 bar was able to synthesize SD in 3 hours as compared to the study of Romanek et al. (2009) at 3 months. In iron reduction, there was no considerable progress in terms of using sulfur as reductant wherein H2S/SO2 mixed with CO2 was used but interestingly, Mora Mendoza et al. (2018) made a novel methodology wherein the size reduction, iron reduction, and carbonation was compressed into one step. Comparing the most effective methodology in Fe-CCS using RG as utilized by Rahmani (2018) to the recent methodology in Ca-CCS proposed by Rahmani (2020), Fe-CCS is slowly approaching Ca-CCS in terms of carbonate purity, with optimized CE of 98.87 % and 97 % for Ca-CCS and Fe-CCS respectively but in optimized conditions at 1 bar, Fe-CCS produced 1.987 g siderite per 10 g RG (12% CE) while Ca-CCS produced 5.44 g calcite per 10 g of RG (98.97% CE). This shows that Fe-CCS is slowly becoming competitive with Ca-CCS.

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