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All Journal JURNAL KIMIA SAINS DAN APLIKASI PROSIDING SEMINAR KIMIA Jurnal Kimia Mulawarman E-Dimas: Jurnal Pengabdian kepada Masyarakat ALCHEMY Jurnal Penelitian Kimia Akta Kimia Indonesia Chemistry Indonesian Journal of Chemical Research Molluca Journal of Chemistry Education (MJoCE) AKM: Aksi Kepada Masyarakat
Allo, Veliyana Londong
Jurusan Kimia, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Mulawarman
Religion Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Education Energy Engineering Environmental Science Materials Science & Nanotechnology Social Sciences Other

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Synthesis and Characterization of Aluminated Santa Barbara Amorphous-15 via Ultrasonic-Enhanced Hydrothermal Method: Effects of Sonication, Solvent Acidity, and Si/Al Ratio Putri, Dini Hariyanto; Subagyono, RR Dirgarini Julia Nurlianti; Allo, Veliyana Londong; Manawan, Maykel
Jurnal Kimia Sains dan Aplikasi Vol 28, No 6 (2025): Volume 28 Issue 6 Year 2025
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.28.6.292-298

Abstract

Aluminated Santa Barbara Amorphous-15 (Al-SBA-15) materials were successfully synthesized using an ultrasonic-enhanced hydrothermal method. The synthesis was conducted by varying the mole ratio of Si precursor and Al precursor (10 and 20), sonication time (3 and 5 hours), and solvent type (2 M hydrochloric acid (HCl) and distilled water). The resulting materials were characterized using N2 sorption analyzer, Fourier Transform Infrared Spectroscopy (FTIR), Small-Angle X-ray Diffraction (SAXRD), Scanning Electron Microscopy (SEM), and Ammonia-Temperature Programmed Desorption (NH3-TPD). FTIR spectra confirmed the presence of siloxane, silanol, and hydroxyl functional groups in all Al-SBA-15 samples. SAXRD analysis showed three characteristic peaks of SBA-15, indicating a two-dimensional hexagonal structure (p6mm). Increasing the sonication time enhanced the surface area from 718 to 767 m2/g, while reducing the pore diameter from 5.96 to 4.81 nm and the pore volume from 1.07 to 0.92 cm3/g. Raising the Si:Al molar ratio slightly increased the surface area (718 to 722 m2/g) and decreased the pore diameter and volume. Additionally, using distilled water instead of 2 M HCl as the solvent raised the surface area from 722 to 785 m2/g, while decreasing the pore diameter from 5.61 to 5.05 nm and slightly lowering the pore volume. The acidity of the Al-SBA-15 material varied according to the sonication time and the amount of Al precursor used, suggesting the potential of regulating the acidic properties through optimization of the synthesis parameters.
Pirolisis Kilat Spirulina platensis dengan Katalis Ni/Al-SBA-15 Ade Putri Wahyuni; RR Dirgarini Julia Nurlianti Subagyono; Rahmat Gunawan; Veliyana Londong Allo; Maykel Manawan
ALCHEMY Jurnal Penelitian Kimia Vol 21, No 2 (2025): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.21.2.93245.251-263

Abstract

Studi ini mempelajari aktivitas katalis Ni/Al-SBA-15 dalam pirolisis kilat mikroalga Spirulina platensis dan perannya pada komposisi kimia produk yang dihasilkan. Katalis Ni/Al-SBA-15 yang disintesis dengan metode ultrasonic-assisted sol-gel memiliki luas permukaan 522,54 m²/g, diameter pori 6,6 nm, dan volume pori 0,86 cm³/g. Analisis Fourier transform infrared (FTIR) katalis mengidentifikasi gugus siloksan, silanol, dan hidroksil, sementara analisis low-angle dan wide-angle X-ray diffraction (XRD) menunjukkan puncak difraksi khas Al-SBA-15 dan NiO. Pirolisis tanpa katalis Ni/Al-SBA-15 menghasilkan produk turunan karbohidrat (10,7%), lipid (53,8%), protein (6,3%), dan klorofil (6,2%). Setelah inkorporasi katalis Ni/Al-SBA-15, produk turunan karbohidrat meningkat menjadi 35,2%, protein menjadi 10,9%, klorofil menjadi 10,7%, namun produk turunan lipid menurun menjadi 15,5%. Hasil ini menunjukan aktivitas katalis dalam meningkatkan konversi senyawa penyusun utama mikroalga, khususnya memecah lipid menjadi senyawa dengan berat molekul lebih kecil. Hal ini mengindikasikan bahwa metode sintesis katalis yang digunakan dapat menghasilkan material yang memiliki distribusi situs aktif yang relatif homogen dan aktivitas katalitik pada pirolisis mikroalga Spirulina platensis.Flash Pyrolysis of Spirulina platensis with Ni/Al-SBA-15 Catalyst. This study investigates the activity of Ni/Al-SBA-15 catalyst in flash pyrolysis of microalgae Spirulina platensis and its role in the chemical composition of the resulting products. The Ni/Al-SBA-15 catalyst synthesized by the ultrasonic-assisted sol-gel method had a surface area of 522.54 m²/g, pore diameter of 6.6 nm, and pore volume of 0.86 cm³/g. Fourier transform infrared (FTIR) analysis of the catalyst identified siloxane, silanol, and hydroxyl groups; meanwhile, low and wide-angle X-ray diffraction (XRD) analysis showed typical diffraction peaks of Al-SBA-15 and NiO. Pyrolysis without Ni/Al-SBA-15 catalyst produced carbohydrate-derived products (10.7%), lipids (53.8%), proteins (6.3%), and chlorophyll (6.2%). After incorporating Ni/Al-SBA-15 catalyst, carbohydrate-derived products increased to 35.2%, protein to 10.9%, and chlorophyll to 10.7%, but lipid-derived products decreased to 15.5%. These results showed the activity of the catalyst in increasing the conversion of the main constituent compounds of microalgae, especially breaking down lipids into smaller molecular weight compounds. This finding indicated that the catalyst synthesis method produced materials with a relatively homogeneous distribution of active sites and catalytic activity in the pyrolysis of microalgae Spirulina platensis.
ANALISIS KOMPOSISI KIMIA PRODUK PIROLISIS LAMBAT OFF-GRADE RUBBER PADA SUHU 300 °C Agustina Tri Putri Sitinjak; RR Dirgarini Julia Nurlianti Subagyono; Veliyana Londong Allo; Ari Susandy Sanjaya
PROSIDING SEMINAR KIMIA Vol 4 No 1 (2025): Prosiding SNK 2025
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

This study was conducted to determine the yield and chemical composition of slow pyrolysis products of off-grade rubber at 300 °C. From the pyrolysis experiments, the yield of bio-oil was 28.25%. Analysis with Gas Chromatography-Mass Spectrometry showed that the bio-oil from off-grade rubber was mainly composed of γ-Elemene, 1H-Benzocycloheptene, octahydro-3,5,5-trimethyl-9-methylene-, (4aS-cis)-, 1,5-Cycloundecadiene, 8,8-dimethyl-9-methylene-, Geranyllinalool Isomer B, and Geranylgeraniol.   Keywords: Slow Pyrolysis, Off-grade Rubber, bio-oil, GC-MS
Studi Komposisi Kimia Produk Pirolisis Kilat Off-grade Rubber dengan Katalis Ni/Ga-SBA-15 Three Uli Sevilla Sitohang; RR Dirgarini Julia Nurlianti Subagyono; Veliyana Londong Allo
Akta Kimia Indonesia Vol. 10 No. 2 (2025): Desember 2025
Publisher : Chemistry Department

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/aki.v10i2.8912

Abstract

This study investigated the chemical composition of flash pyrolysis products from off-grade rubber, a low-quality byproduct of natural rubber processing, with and without Ni/Ga-SBA-15 catalyst. The flash pyrolysis was conducted under helium using pyrolysis–Gas Chromatography/Mass Spectrometry (Py-GC/MS) at 200 °C and 300 °C. The off-grade rubber contained 23.62 ± 2.26 wt. % moisture and 11.24 ± 1.09 wt. % ash. FTIR analysis revealed the functional groups in the rubber sample, including =C–H, -CH₂, C=O, C=C, -CH₃, C–O–C, and C–O. Py-GC/MS identified major pyrolysis products at both temperatures, before and after catalyst addition, as terpenoid derivatives, fatty acid derivatives, and aromatic and non-aromatic hydrocarbons. At 200 °C, the catalyst reduced the percent area of n-hexadecanoic acid while increasing the percent area of squalene, indicating enhanced deoxygenation activity. At 300 °C, the catalyst increased the percent areas of d-limonene, cyclohexane derivatives, and azulene. Overall, Ni/Ga-SBA-15 promoted the formation of terpenoid derivatives, while reducing the production of less desirable fatty acid derivatives. These results demonstrate that catalytic flash pyrolysis can modify product distribution from off-grade rubber.
Co-Authors Ade Putri Wahyuni Agustina Tri Putri Sitinjak Anisa, Nia Nur Ari Susandy Sanjaya, Ari Susandy D J N Subagyono Digva Willyan Djihan Ryn Pratiwi, Djihan Ryn Evi Mardiani, Evi Fitriah, Nur Azizah Gunawan, Rahmat Halimatus Sa'diyah Harvina, Harvina Husna Syaima Irfan Ashari Hiyahara Irfan Ashari Hiyahara Maahury, Mirella Fonda Manawan, Maykel Maykel Manawan Moh Syaiful Arif Muhammad Abdulkadir Martoprawiro Muhammad Irvan Mulya Pratama Nana Lestari Nanang Tri Widodo Noor Afdaliah Noor Hindryawati Praskianto, Ahmed Iqbal Putri, Dini Hariyanto R R Dirgarini Julia Nurlianti Subagyono Rachmawanti, Octaviana Rahmah, Siti RAHMAT GUNAWAN Rahmat GUnawan Rahmat Gunawan Rahmat Gunawan Rahmat Gunawan RR Dirgarini Julia Nurlianti Subagyono RR Dirgarini Julia Nurlianti Subagyono RR Dirgarini Julia Nurlianti Subagyono Rudy Agung Nugroho Siti Sarah Subagyono, R. R Dirgarini J.N. Subagyono, R.R. Dirgarini Subagyono, R.R. Dirgarini Julia Nurlianti Subagyono, RR Dirgarini Julia Nurlianti Three Uli Sevilla Sitohang Wardina Masdalifa