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All Journal Konversi Jurnal Daur Lingkungan
Robert Junaidi
Sriwijaya State Polytechnic
Control & Systems Engineering Education

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Pemanfaatan Zeolit Alam Malang Sebagai Adsorben Pada Pemurnian Crude Glycerol Dalam Kolom Adsorpsi Oktaviani Tri Utami; Mustain Zamhari; Robert Junaidi
Jurnal Daur Lingkungan Vol 9, No 1 (2026): February
Publisher : Universitas Batanghari Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33087/daurling.v9i1.316

Abstract

Glycerol is a byproduct of the biodiesel transesterification reaction that has a low purity level, also known as crude glycerol. Approximately 10-20% by weight of glycerol is produced as a byproduct of each biodiesel transesterification reaction. Crude glycerol contains many impurities, which has led to its suboptimal management. To reduce waste generated from the biodiesel transesterification reaction, further purification is necessary to produce high-purity glycerol with significant market value that can be used in various industries. Therefore, researchers aim to utilize natural zeolite from Malang as an adsorbent in the purification of crude glycerol. This study is conducted to understand the impact of chemical and physical activation on Malang natural zeolite in enhancing its characteristics as an adsorbent and to determine the optimal conditions (residence time and adsorbent weight) for achieving the highest purity glycerol through the adsorption process. The natural zeolite from Malang was prepared by activation with H2SO4 and calcined with 3 hours at 500°C. This was followed by an adsorption method using an adsorption column with varying residence times (30, 45, 60, 75, and 90 minutes) and adsorbent weights (20g, 40g, and 60g). The chemical and physical activation of Malang natural zeolite successfully enhanced its adsorption capacity by increasing the active pore size (0.97 μm – 4.42 μm) and reducing impurity ions, as well as raising the Si/Al ratio to 4.503. The optimal glycerol purity achieved was 86.33% with adsorbent weight of 60 grams and a residence time of 60 minutes.
The effect of Ni/Al2O3 catalyst mass variation and operation time on the CO2 methanation process Yongki Pratama; Robert Junaidi; Didiek Hari Nugroho
Konversi Vol 14, No 2 (2025): OCTOBER 2025
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v14i2.23597

Abstract

Carbon dioxide (CO2) is one of the biggest contributors to the greenhouse effect. Based on data from the International Energy Agency (IEA), greenhouse gas (GHG) emissions continue to increase, reaching 37.8 billion tons in 2024. One way to reduce carbon dioxide (CO2) is to convert carbon dioxide (CO2) into methane (CH4) through a methanation process using a Fixed Bed Reactor. This study was conducted by varying the mass of Ni/Al2O3 catalyst between 55 grams and 60 grams and the operating time between 90, 100, 110, 120, and 130 minutes, as well as adding 20 grams of Zn promoter to improve catalyst stability performance. A Multi Gas Detector Analyzer was used to analyze the methane (CH4) gas produced. The results of this study showed that the highest percentage of methane gas (CH4) produced was obtained in sample 10 with a Ni/Al2O3 catalyst mass of 60 grams and an operating time of 130 minutes, which was 58.35%.
Regeneration of Ni/Al2O3 catalyst in CO2 methanation Rima Melati; Robert Junaidi; Mustain Zamhari
Konversi Vol 13, No 2 (2024): OKTOBER 2024
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v13i2.19951

Abstract

CO₂ emissions are one form of greenhouse gas (GHG) emissions that contribute to global warming. CO₂ contributed 175.62 million tons in 2021, impacting greenhouse gas levels. One strategy to reduce the concentration of CO₂ in the atmosphere is to convert CO₂ gas into useful chemicals. One example of this is the hydrogenation of CO₂ to produce methane, which can serve as an alternative to LPG. The aim of this research is to produce methane gas by developing a fixed bed reactor in a simple manner. The catalyst Ni/Al2O3 with 20 grams and five regenerations could produce CH₄ up to 49.73% compared to 39.06% for those with 10 grams. However, the H2 gas remaining is higher for those with 10 grams (1.454 ppm compared to 1.042 ppm). Also, The CO2 gas remaining is higher for those with 10 grams (58.18% compared to 47.92%). The results of this study can be the basis for developing energy policies, encouraging investment in clean energy technologies, and supporting the reduction of greenhouse gas emissions for energy sustainability and resilience.
Co-Authors Didiek Hari Nugroho Mustain Zamhari Oktaviani Tri Utami Rima Melati Yongki Pratama