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All Journal Jurnal Sains Materi Indonesia Jurnal Neutrino : jurnal fisika dan aplikasinya Jurnal Sumberdaya Alam dan Lingkungan Konversi Jurnal Teknik JURNAL PENDIDIKAN TAMBUSAI Jurnal Inovator Jurnal Daur Lingkungan ASEAN Journal of Chemical Engineering Kinetika Yumary: Jurnal Pengabdian kepada Masyarakat Jurnal Energi Baru dan Terbarukan AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Jurnal Teknologi Chemical Engineering Journal Storage (CEJS) Innovative: Journal Of Social Science Research Journal Serambi Engineering (JSE) Jurnal Pengabdian Kepada Masyarakat
Robert Junaidi
Politeknik Negeri Sriwijaya
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Pemanfaatan Ekstrak Silika Bottom Ash Batubara untuk Reaksi Hidrolisis Aluminium dalam Produksi Gas Hidrogen di Fixed Bed Reactor Wulandari, Wahyu; Junaidi, Robert; Hasan, Abu
Jurnal Sumberdaya Alam dan Lingkungan Vol 12, No 2 (2025)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jsal.2025.012.02.2

Abstract

ABSTRAK Hidrogen merupakan salah satu sumber energi potensial yang berkelanjutan dan bersih dengan kepadatan energi tinggi (140 MJ/kg). Abu berat merupakan limbah padat yang sulit larut dan menguap serta memerlukan pengolahan khusus. Pembakaran batubara di PLTU menghasilkan limbah berupa fly ash dan bottom ash dalam jumlah besar setiap tahunnya, yang berpotensi mencemari lingkungan jika tidak dimanfaatkan dengan tepat. Pada tahun 2021, Indonesia menghasilkan sekitar 9.7 juta ton limbah abu terbang (fly ash dan bottom ash). Tujuan dari penelitian ini adalah memanfaatkan kandungan 53-70 Si pada abu terbang untuk meningkatkan gas hidrogen dengan menambahkan zat pereduksi aluminium dan memvariasikan konsentrasi katalis KOH. Katalis KOH digunakan karena KOH menghasilkan lebih banyak gas hidrogen dibandingkan NaOH. Penelitian ini dilakukan dengan mereaksikan 3 sampai 6 gram aluminium: silikon dengan air suling dan katalis KOH 4,5 M - 5M dan ini dilakukan pada temperatur 50°C selama 15 menit. Dengan berat auminium:silicon 6 gran dan konsentrasi KOH 5.5 M menghasilkan produksi gas hydrogen sebesar 68%. Semakin banyak penggunaan aliminium:silikon dan semakin tinggi konsentrasi KOH yang digunakan maka gas hidrogen yang dihasilkan akan semakin banyak. Kata kunci: Aluminium, bottom ash batubara, hidrogen, silikon ABSTRACT Hydrogen is a potential sustainable and clean energy source with a high energy density (140 MJ/kg). Heavy ash is a solid waste that is difficult to dissolve and evaporate, requiring special treatment. In 2021, Indonesia produced approximately 9.7 million tons of fly ash and bottom ash. This study aims to utilize the 53–70% Si content in fly ash to enhance hydrogen gas production by adding aluminum as a reducing agent and varying the concentration of KOH catalyst. KOH was selected as the catalyst because it generates more hydrogen gas compared to NaOH. The experiment was carried out by reacting 3 to 6 grams of aluminum:silicon with distilled water and KOH catalyst at concentrations ranging from 4.5 M to 5 M, maintained at 50°C for 15 minutes. The highest hydrogen gas production of 68% was obtained with 6 grams of aluminum:silicon and a KOH concentration of 5.5 M. The results showed that increasing the amount of aluminum:silicon and the concentration of KOH led to greater hydrogen gas generation. Keywords:  Aluminum, coal bottom ash, hydrogen, silicon
Pengaruh Variasi Temperatur dan Promotor Zn terhadap Konversi Karbon Dioksida (CO2) Menggunakan Katalis Ni/Al2O3 Novariana, Mayra; Junaidi, Robert; Mujiyanti, Apri
Jurnal Teknologi Vol 25, No 3 (2025): Desember 2025
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v25i3.7923

Abstract

The ever-increasing need for fossil fuels, including natural gas, petroleum, and coal, to drive economic growth, has triggered a significant increase in carbon dioxide emissions. Methane is the most basic hydrocarbon compound, under standard temperature and pressure conditions, methane is a colorless and odorless gas. Nickel-based catalysts are the most widely used catalysts in the CO₂ methanation process because they have high activity and selectivity towards methane (CH₄) formation. This study aims to optimize the conversion of carbon dioxide into methane gas using a Catalytic Batch Reactor with the help of a Ni/Al₂O₃ catalyst with variations in temperature and NaOH flow rate. In this study, CO₂ is used as a raw material with a Ni/Al₂O₃ catalyst and a Zn promoter. The Zn Promoter Mass and temperature will be regulated with variations. For methane gas analysis, a Multi Gas Detector Analyzer will be used. From this study, the results showed that the highest methane gas (CH₄) was obtained at a temperature of 200°C with the addition of 15 grams of Zn promoter, which is 56.44%.
The effect of Ni/Al2O3 catalyst mass variation and operation time on the CO2 methanation process Pratama, Yongki; Junaidi, Robert; Nugroho, Didiek Hari
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%.
PEMBUATAN GAS HIDROGEN DARI LIMBAH ALUMINIUM KALENG SOFT DRINK MENGGUNAKAN KATALIS KALIUM HIDROKSIDA (KOH) Selviana, Selviana; Purnamasari, Indah; Junaidi, Robert
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.v9i1.317

Abstract

Cans of soft drinks are a source of waste in Indonesia, as this inorganic waste cannot be decomposed rapidly and naturally. Aluminum takes about 400 years to decompose in the soil. A large amount of aluminum contained in the cans can be reused as goods or raw materials to produce hydrogen gas. Hydrogen is considered an environmentally friendly fuel regarding its very low emissions and high energy value. The hydrogen gas production process involves a reaction between aluminum metal and a catalyst. In this case, the use of a strong base catalyst such as KOH has been shown to produce more hydrogen. This experiment aims to utilize the cans as a material to produce hydrogen gas. This experimental process was carried out by reacting aluminum metal powder sourced from used drinking cans with varying aluminum masses of 3, 4, 5 and 6 g with water and KOH catalysts of 2, 3 and 4 M in a fixed bed reactor, with a process for 20 minutes at a temperature of 50 °C. The results of the reactions were analyzed using a Gas Detector Analyzer. This study shows that 6 g of aluminum catalyzed with 4 M KOH results in 66% Hydrogen gas, and 3 g of aluminum catalyzed with 2 M KOH results in 20% Hydrogen gas. This proves that increasing the amount of mass and concentration in the process increases the resulting volume of hydrogen gas.
Pemanfaatan Zeolit Alam Malang Sebagai Adsorben Pada Pemurnian Crude Glycerol Dalam Kolom Adsorpsi Utami, Oktaviani Tri; Zamhari, Mustain; Junaidi, Robert
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.
Pengaruh Variasi Jumlah Katalis Ni/Al2O3 dan Konsentrasi KOH Terhadap Efisiensi Metanasi CO2 Gilang Ramahdan; Junaidi, Robert; Ekawati, Linda
Chemical Engineering Journal Storage (CEJS) Vol. 6 No. 01 (2026): Chemical Engineering Journal Storage (CEJS)-Febuari 2026
Publisher : LPPM Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/cejs.v6i01.24201

Abstract

Pencemaran karbon dioksida (CO2) adalah salah satu permasalahan lingkungan global yang saat ini menjadi isu yang sangat penting. Menurut data dari Badan Pusat Statistik (BPS) Indonesia, emisi karbon dioksida di Indonesia meningkat sebesar 4,54% dari tahun 2015 hingga 2019. Pada tahun 2015, emisi karbon dioksida di Indonesia mencapai sekitar 505,3 juta ton CO2. Namun pada tahun 2019, emisi karbon dioksida meningkat menjadi sekitar 527,3 juta ton CO2 . dari batu bara naik 1,6% sedangkan emisi bahan bakar minyak meningkat 2,5%. Salah satu cara untuk mengurangi karbon dioksida di atmosfer adalah dengan mengubah karbon dioksida dan menggunakannya dalam bahan kimia, misalnya dengan menghidrogenasi CO2 menjadi metana. Tujuan dari penelitian ini adalah menghasilkan gas metana dari karbon dioksida menggunakan variasi jumlah katalis Ni/Al2O3 dan variasi konsentrasi KOH. Dalam penelitian ini, digunakan CO2 sebagai bahan baku dengan katalis Ni/Al2O3 dan logam Zn. Jumlah Katalis Ni/Al2O3 diatur dengan variasi (51,52, 53 dan 54 gram), konsentrasi KOH diatur dengan variasi (3,5M; 4M; dan 4,5M) dan waktu operasi 20 menit. Untuk analisa gas metana (CH4) yang dihasilkan akan dianalisa menggunakan Multi Gas Detector Analyzer. Berdasarkan hasil penelitian ini gas metana hasil konversi paling tinggi diangka 47,58% dengan variasi pada jumlah katalis 54 gram dan konsentrasi KOH 4,5M
Co-Authors ., Anerasari Abu Hasan Ahmad Muhajir, Ahmad Amanah, Tria Rizki Amin, Jaksen M Anerasari Meidinariasty Arisqi, Muhamad Muammar Arizal Aswan Aulia, Risa Azizah, Roro Rizqi Ramadhani Darmawan, Azzahrah Putri Didiek Hari Nugroho Ekawati, Linda Erwana Dewi Fadarina Fatahul Arifin, Fatahul Gilang Ramahdan Gilbert, Amudi Jhon Harwanda, Muhammad Sabdian HC, Fadarina Heru Santoso Hilwatullisan Indah Purnamasari Kalsum, Leila Khairunnisa, Annisa Septia Manggala, Agus Martha Aznury Miftahul Jannah Muhammad Yerizam Mujiyanti, Apri Mustain Zamhari Niawanti, Helda Ningrum, Galuh Martiyah Novariana, Mayra Oktarina, Ayu Pahlevi, Muhammad Agmerio Parega, Sultan Pramudya, Nabila Salwa Pratama, Yongki Rachmatika, Nisa Rahmaniar Rahmaniar, Rahmaniar Ramadhani, Dea Rizki Riansyah, Epan Riki Wahyudi, Riki Rima Melati Rusdianasari Rusdianasari Saputra, Mailanda Sardewi, Tri Sari, Della Yusfita Sari, Rahmaida Selastia Yuliati Selviana Selviana Setiawan, Farah Kania Sofiah Sofiah Sulistyawati, Novia Ayu Tamara, Ade Toluna, Yona Utami, Oktaviani Tri Utami, Winda Andea Wahyu Wulandari Wijaya, Satria Agung Yerizam, M. Yuliani, Tasya Dwi Zaman, Muhammad Zulkarnain S.T.,M.T.