Study of the Crystal Structure of CaO/SiO₂, MgO/SiO₂, and CaO–MgO/SiO₂ Catalysts
-
Andreas Venans Nahak(1*)
Department of Chemistry Education, Faculty of Teacher Training and Education, Universitas Nusa Cendana
-
Kasimir Sarifudin(2)
Department of Chemistry Education, Faculty of Teacher Training and Education, Universitas Nusa Cendana
-
Lolita A. M Parera(3)
Department of Chemistry Education, Faculty of Teacher Training and Education, Universitas Nusa Cendana
(*) Corresponding Author
Abstract
This study aims to analyze the crystal structure characteristics and phase composition of the CaO/SiO2, MgO/SiO2, and CaO-MgO/SiO2 catalysts, and to synthesize SiO2 from Ende Flores Natural Zeolite using the hydrothermal and sol-gel methods. CaO was synthesized from Kupang NTT hard water lime deposits, refluxed with HCl, and titrated with Na2CO3, then calcined at 1000 ºC to obtain CaO. MgO was synthesized from MgCO3 calcined at 800 °C. The synthesis of each type of catalyst, CaO/SiO2, MgO/SiO2, and CaO-MgO/SiO2, was carried out using the impregnation method. The XRD characterization results show that, in SiO2, the tridymite phase with a triclinic crystal structure is formed. CaO forms the Lime phase with a cubic crystal structure, while the MgO catalyst shows the Periclase phase and also has a cubic crystal structure. The CaO/SiO2 catalyst forms a single phase, namely Larnite (Ca2SiO4), with a monoclinic crystal structure. The MgO/SiO2 catalyst formed three phases, namely the dominant Periclase phase (MgO) with a cubic crystal structure, the Olivine phase (Mg2SiO4) with an orthorhombic crystal structure, and the Tridymite phase (SiO2) with a cubic crystal structure. The CaO-MgO/SiO2 catalyst forms two phases, namely the dominant phase Olivine (Mg2SiO4) with an orthorhombic crystal structure and the Portlandite phase (CaH2O2) with a trigonal crystal structure.
Downloads
References
A. D. Anggita, “Peran katalis dalam reaksi : Dari teori ke aplikasi pada industri kimia,” vol. 2, no. 8, hal. 484–491, 2024.
Yuhelson, Prasetya, M. R. Fauzi1, dan P. Triasih, “Efektifitas Dibandingkan Katalis Homogen Untuk Produksi Biodiesel,” vol. 6, no. 1, hal. 1–4, 2015.
R. Hartono et al., “Sintesis Katalis Asam Heterogen Berbasis Polivinil Alkohol ( PVA ) dan Pemanfaatannya dalam Produksi Metil Ester Asam Lemak,” vol. 17, hal. 179–190, 2023, doi: 10.22146/jrekpros.84514.
Kusmiyati dan A. Sugiharto, “Production of Biodiesel from Oleic Acid and Methanol by Reactive Distillation,” vol. 5, no. 1, hal. 1–6, 2010.
Xianglong, H. Su, R. Song, J. Su, dan J. Bian, “Solvent-Free Aldol Condensation of Cyclopentanone with Natural Clay-Based Catalysts: Origin of Activity & Selectivity,” 2023.
R. Muttaqin, W. Sakti, W. Prayitno, dan U. Nurbaiti, “Pengembangan Buku Panduan Teknik Karakterisasi Material : X -ray Diffractometer ( XRD ) Panalytical Xpert3 Powder,” vol. 6, no. 1, hal. 9–16, 2023.
R. Rasyid, L. Wiyani, A. Q. Ramadhan, dan M. A. Ahmad, “Efektivitas Katalis Mg ( OH ) 2 / γ-Al 2 O 3 Pada Proses Perengkahan Katalitik Effectiveness of Mg ( OH ) 2 / γ-Al 2 O 3 Catalysts on Catalytic Cracking Process,” vol. 9, no. 1, 2024.
Mashudi dan Munasir, “PENGARUH WAKTU TAHAN PADA PROSES HYDROTHERMAL DAN TEMPERATUR KALSINASI TERHADAP KEKRISTALAN SILIKA DARI BAHAN ALAM PASIR KUARSA,” vol. 04, hal. 32–36, 2015.
D. A. Zamiatina, D. A. Zamyatin, G. B. Mikhalevskii, dan N. S. Chebikin, “Silica Polymorphs Formation in the Jänisjärvi Impact Structure : Tridymite, Cristobalite, Quartz, Trace Stishovite and Coesite,” 2023.
W. Patkowski et al., “The Influence of Active Phase Content on Properties and Ammonia Synthesis,” 2023.
D. Grzybek, “Experimental Analysis of Hysteresis in the Motion of a Two-Input Piezoelectric Bimorph Actuator,” 2023.
K. D. Nugrahaningtyas, S. N. Zalfa, F. Rahmawati, I. F. Nurcahyo, dan Y. Hidayat, “Studi awal kestabilan struktur katalis logam transisi periode pertama berbasis HZSM-5,” vol. 17, hal. 83–91, 2023, doi: 10.22146/jrekpros.76449.
D. Saputri dan L. Rohmawati, “Sintesis Magnesium Oksida (MgO) dari Dolomit Bangkalan dengan Metode Leaching,” vol. 09, no. 02, hal. 203–210, 2021.
I. Prasetyo, D. A. K. Nur’aeni, dan P. T. Bhaskara, “Preparasi Katalis MgO/C dari Pirolisis Polimer Berbasis Magnesium Salisilat dan Aplikasinya untuk Reaksi Transesterifikasi,” vol. 15, no. 1, hal. 84–93, 2021, doi: 10.22146/jrekpros.65855.
S. Y. S, A. Falahudin, N. Haida, M. Kaus, dan S. Thongmee, “Preliminary Synthesis of Calcium Silicates using Oil Palm Leaves and Eggshells,” vol. 15, no. 2, hal. 561–567, 2020, doi: 10.9767/bcrec.15.2.7591.561-567.
N. A. Yamnova, N. V Zubkova, N. N. Eremin, A. E. Zadov, dan V. M. Gazeev, “Crystal Structure of Larnite β Ca 2 SiO 4 and Specific Features of Polymorphic Transitions in Dicalcium Orthosilicate,” vol. 56, no. 2, hal. 235–245, 2011, doi: 10.1134/S1063774511020209.
Y. A. Ndak, K. Sarifudin, dan Sudirman, “Pengaruh Komposisi SiO2 Pada Katalis Cao/SiO2 Terhadap Karakter Morfologi Permukaan, Ukuran Partikel dan Rendamen Metil Ester Reaksi Transesterifikasi Minyak Jarak,” vol. 1, no. November, hal. 64–77, 2021.
T. Zhang, J. Zou, B. Wang, Z. Wu, Yuan Jia, dan C. R. Cheeseman, “Characterization of Magnesium Silicate Hydrate (MSH) Gel Formed by Reacting MgO and Silica Fume,” hal. 1–15, doi: 10.3390/ma11060909.
H. K. Jorena dan A. A. Bama, “Uji Fisis dan Mekanik pada Desain Struktur Keramik Forsterite (Mg 2 SiO 4 ) dengan Teknik Sintering (Solid State-Reaction),” vol. 20, 2018.
K. Sarifudin dan S. A. P. Henukh, “Sintesis dan Karakterisasi Komposisi Unsur, Oksida dan Stabilitas Termal Katalis Berbasis CaO, MgO dan SiO2,” vol. 25, 2025.
Copyright (c) 2026 Andreas Venans Nahak, Kasimir Sarifudin, Lolita A. M Parera
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Copyright is retained by the authors, and articles can be freely used and distributed by others.
