Pemanfaatan Dead Coral sebagai Prekursor CaO untuk Sorben CO₂ dalam Siklus Karbonasi-Dekarbonasi Suhu Rendah

Anjaya, Shalsabilla Dhea and Bastiansyah, Farrel (2026) Pemanfaatan Dead Coral sebagai Prekursor CaO untuk Sorben CO₂ dalam Siklus Karbonasi-Dekarbonasi Suhu Rendah. Diploma thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pengembangan sorben berbasis CaO menjadi salah satu strategi penting dalam penangkapan CO₂ melalui siklus karbonasi–dekarbonasi, terutama untuk mendukung teknologi produksi hidrogen rendah emisi seperti sorption-enhanced steam methane reforming (SE-SMR). Namun, regenerasi CaCO3 menjadi CaO masih memerlukan temperatur tinggi dan dapat menyebabkan sintering yang menurunkan stabilitas sorben. Penelitian ini bertujuan untuk mengevaluasi material karang mati sebagai sumber CaCO3 biogenik dan prekursor sorben CaO alami. Sampel karang mati jenis Acropora sp., Porites sp., dan Pocillopora sp. dikarakterisasi menggunakan XRF, XRD, FTIR, SEM, dan CO₂-TPD, sedangkan performa karbonasi–dekarbonasi dianalisis menggunakan TGA/DTG. Hasil XRF menunjukkan bahwa Acropora sp. memiliki komposisi CaO ekuivalen tertinggi, yaitu sekitar 97%, diikuti oleh Porites sp. sekitar 89% dan Pocillopora sp. sekitar 80%. Analisis XRD dan FTIR mendukung transformasi CaCO3 menjadi CaO setelah dekarbonasi, sedangkan SEM menunjukkan perbedaan morfologi masing-masing sampel. Hasil CO₂-TPD menunjukkan bahwa Acropora sp. memiliki kapasitas interaksi CO₂ tertinggi sebesar 4,777 mmol/g. Uji TGA/DTG menunjukkan dekomposisi CaCO3 pada Acropora sp. berlangsung sekitar 500 °C dan cenderung lebih rendah dibandingkan sampel lainnya. Selain itu, Acropora sp. menunjukkan stabilitas siklik terbaik dengan penurunan massa paling kecil, yaitu 3,13%. Dengan demikian, Acropora sp. merupakan material paling potensial sebagai prekursor sorben CaO untuk siklus karbonasi-dekarbonasi berulang.
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The development of CaO-based sorbents is an important strategy for CO₂ capture through carbonation-decarbonation cycles, particularly to support low-emission hydrogen production technologies such as sorption-enhanced steam methane reforming (SE-SMR). However, the regeneration of CaCO3 into CaO still requires high temperatures and may induce sintering, which reduces sorbent stability. This study aims to evaluate dead coral reef material as a biogenic CaCO3 source and a natural precursor for CaO-based sorbents. Dead coral reef samples, namely Acropora sp., Porites sp., and Pocillopora sp., were characterized using XRF, XRD, FTIR, SEM, and CO₂-TPD, while their carbonation–decarbonation performance was evaluated using TGA/DTG. The XRF results showed that Acropora sp. had the highest equivalent CaO composition, approximately 97%, followed by Porites sp. at approximately 89% and Pocillopora sp. at approximately 80%. XRD and FTIR analyses confirmed the transformation of CaCO3 into CaO after decarbonation, while SEM revealed differences in morphology among the samples. CO₂-TPD analysis showed that Acropora sp. exhibited the highest CO₂ interaction capacity, reaching 4.777 mmol/g. TGA/DTG results indicated that CaCO3 decomposition in Acropora sp. occurred at around 500 °C and tended to proceed at a lower temperature than the other samples. In addition, Acropora sp. showed the best cyclic stability, with the lowest mass loss of 3.13%. Therefore, Acropora sp. is the most promising material as a CaO sorbent precursor for repeated carbonation–decarbonation cycles.

Item Type:	Thesis (Diploma)
Uncontrolled Keywords:	CaO, Karang Mati, Sorben CaO, Dead Coral, Sorbents
Subjects:	T Technology > TP Chemical technology > TP155.7 Chemical processes. T Technology > TP Chemical technology > TP245.C3 Calcium carbonate.
Divisions:	Faculty of Vocational > 24305-Industrial Chemical Engineering Technology
Depositing User:	Farrel Bastiansyah
Date Deposited:	31 Jul 2026 04:03
Last Modified:	31 Jul 2026 04:03
URI:	http://repository.its.ac.id/id/eprint/140637

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