Analisis Pengaruh Variasi Penambahan MgO Dan Lama Waktu Sintering Terhadap Pembentukan Fasa Dan Mikrostruktur Pada Castable Refractory Alumina Untuk Aplikasi Carbon Capture

Zahroni, Moch. Iqbal (2026) Analisis Pengaruh Variasi Penambahan MgO Dan Lama Waktu Sintering Terhadap Pembentukan Fasa Dan Mikrostruktur Pada Castable Refractory Alumina Untuk Aplikasi Carbon Capture. Other thesis, Institut Teknologi Sepuluh Nopember.

Text 5011221118-Undergraduate_Thesis.pdf - Accepted Version Restricted to Repository staff only Download (4MB)

Abstract

Emisi karbon dioksida (CO₂) dari sektor industri merupakan salah satu penyebab utama pemanasan global sehingga diperlukan pengembangan material yang mampu mendukung teknologi carbon capture. Salah satu material yang berpotensi digunakan adalah castable refractory berbasis alumina dengan penambahan magnesium oksida (MgO), karena MgO mampu bereaksi dengan CO₂ membentuk magnesium karbonat (MgCO₃). Penelitian ini bertujuan untuk menganalisis pengaruh variasi penambahan MgO dan waktu sintering terhadap pembentukan fasa, mikrostruktur, serta potensi castable refractory alumina sebagai material carbon capture. Penelitian menggunakan castable refractory high alumina low cement dengan variasi penambahan MgO sebesar 5%, 7%, dan 9%, kemudian disinter pada suhu 1200°C dengan holding time selama 2 jam dan 4 jam. Seluruh sampel selanjutnya dikarbonasi menggunakan gas CO₂ selama 2 jam dengan laju alir 70 mL/menit. Karakterisasi dilakukan menggunakan X-Ray Fluorescence (XRF), X-Ray Diffraction (XRD), Scanning Electron Microscopy–Energy Dispersive Spectroscopy (SEM-EDS), dan Thermogravimetric Analysis (TGA). Hasil XRF menunjukkan bahwa material didominasi oleh Al₂O₃ sebesar 61,84% dengan sistem Al₂O₃–MgO–SiO₂. Analisis XRD mengidentifikasi korundum (α-Al₂O₃) sebagai fasa dominan, disertai pembentukan spinel (MgAl₂O₄), periklase (MgO), dan magnesit (MgCO₃) setelah proses karbonasi. Hasil SEM-EDS menunjukkan bahwa peningkatan waktu sintering menghasilkan distribusi unsur Mg dan Al yang lebih homogen sehingga mendukung pembentukan spinel dan memperbaiki kontak antarpartikel. Hasil TGA mengonfirmasi keberadaan MgCO₃ melalui dekomposisi pada rentang temperatur 336–500°C dengan nilai Degree of Carbonation sebesar 1,54%, yang menunjukkan bahwa sebagian MgO bebas berhasil bereaksi dengan CO₂. Berdasarkan hasil tersebut dapat disimpulkan bahwa penambahan MgO berpengaruh terhadap pembentukan fasa, sedangkan waktu sintering memengaruhi homogenitas mikrostruktur. Kombinasi kedua parameter tersebut menunjukkan bahwa castable refractory alumina berpotensi dikembangkan sebagai material pendukung aplikasi carbon capture, meskipun optimasi komposisi dan kondisi proses masih diperlukan untuk meningkatkan efisiensi penyerapan CO₂.
===============================================================================================================================
Carbon dioxide (CO₂) emissions from the industrial sector are one of the major contributors to global warming, highlighting the need for the development of materials that support carbon capture technology. One potential material is alumina-based castable refractory with the addition of magnesium oxide (MgO), as MgO can react with CO₂ to form magnesium carbonate (MgCO₃). This study aimed to investigate the effect of MgO content and sintering time on phase formation, microstructure, and the potential of alumina castable refractory as a carbon capture material. High-alumina low-cement castable refractory specimens were prepared with MgO additions of 5%, 7%, and 9%, followed by sintering at 1200°C with holding times of 2 and 4 hours. All specimens were subsequently carbonated using CO₂ gas for 2 hours at a flow rate of 70 mL/min. Material characterization was performed using X-Ray Fluorescence (XRF), X-Ray Diffraction (XRD), Scanning Electron Microscopy–Energy Dispersive Spectroscopy (SEM-EDS), and Thermogravimetric Analysis (TGA). XRF analysis revealed that the material was predominantly composed of Al₂O₃ (61.84%), forming an Al₂O₃–MgO–SiO₂ system. XRD analysis identified corundum (α-Al₂O₃) as the dominant phase, accompanied by the formation of spinel (MgAl₂O₄), periclase (MgO), and magnesite (MgCO₃) after the carbonation process. SEM-EDS observations indicated that prolonged sintering promoted a more homogeneous distribution of Mg and Al, thereby facilitating spinel formation and improving interparticle bonding. TGA analysis confirmed the presence of MgCO₃ through its thermal decomposition within the temperature range of 336–500°C, yielding a Degree of Carbonation of 1.54%, which indicates that a portion of the free MgO successfully reacted with CO₂. The results demonstrate that MgO addition significantly influences phase formation, while sintering time affects microstructural homogeneity. The combination of these parameters suggests that alumina castable refractory has promising potential as a supporting material for carbon capture applications, although further optimization of composition and processing conditions is required to enhance CO₂ capture efficiency.

Item Type:	Thesis (Other)
Subjects:	Q Science > QC Physics > QC162 Adsorption and absorption Q Science > QD Chemistry > QD117 Absorption Q Science > QD Chemistry > QD481 Chemical structure. Q Science > QD Chemistry > QD79.T38 Thermal analysis
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Industrial Engineering > 26201-(S1) Undergraduate Thesis
Depositing User:	Moch. Iqbal Zahroni
Date Deposited:	24 Jul 2026 08:05
Last Modified:	24 Jul 2026 08:05
URI:	http://repository.its.ac.id/id/eprint/137164

Actions (login required)

View Item