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Didiek Hari Nugroho
Politeknik Negeri Sriwijaya
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Education Electrical & Electronics Engineering Engineering

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Kinetika Reaksi Co2 Dari Gas Buang Motor dengan Menggunakan NaOH pada Reaktor Gelembung Pancaran Kahfi Ramadhan; Indah Purnamasari; Cindi Ramayanti; Didiek Hari Nugroho
TEKNIKA Vol. 19 No. 1 (2025): TEKNIKA
Publisher : Politeknik Negeri Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.13978471

Abstract

Kandungan gas CO2 yang berlebih dalam udara akan menyebabkan efek greenhouse. Efek greenhouse akan meningkatkan suhu atmosfer sehingga menimbulkan efek pemanasan global. Penelitian ini bertujuan untuk mengetahui laju alir cair, laju aliran gas CO2 dan temperatur terhadap kinetika absorbsi CO2  yang dapat menyebabkan terjadinya efek greenhouse dari gas buangan kendaraan bermotor. Proses penyerapan gas CO2  oleh NaOH yang  lebih efektif dan efisien , dilihat dari pengaruh  tingginya konsentrasi NaOH, volume NaOH  dan waktu NaOH dan Gas CO2 mencapai titik jenuh. Metode penelitian dengan menggunakan alat  reaktor kolom gelembung pancaran untuk mengetahui  laju  alir gas, laju alir cairan dan temperatur yang akan  diukur hasil absorbsi nya dengan menngunakan Gas Analyzer. Hasil analisis laju alir cair didapatkan hasil terbaik dengan laju alir di 0,6 dan 0,8. Data analisis temperature didapatkan hasil terbaik dengan laju alir di 0,8 dan temperatur 40 Co dan 50 Co. Hasil analisis laju alir gas terbaik didapatkan nilai 0,5, konsentasi 0,4 dan temperatur 50 Co dengan konversi CO2 0.8446 ppm.
Conversion of CO₂ to methane in the methanation process using Ni/Al₂O₃ catalyst Muhammad Fikri; Erika Dwi Oktaviani; Didiek Hari Nugroho
Konversi Vol 15, No 2 (2026): OCTOBER 2026
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v15i2.27345

Abstract

Carbon dioxide (CO₂) is a major greenhouse gas, with global emissions reaching 37.8 billion tons in 2024. CO₂ methanation via the Sabatier reaction offers a promising route for converting CO₂ into methane (CH₄) as a synthetic fuel. This study investigates the effect of reactor temperature (180–300°C) and operating time (60–180 minutes) on CO₂ conversion using a Ni/Al₂O₃ catalyst with a Zn promoter in a fixed-bed reactor integrated with a NaOH absorption unit. The novelty lies in the dual integration of NaOH, which is fed directly into the reactor and circulated to the post-reactor absorber, combined with a tray system for uniform gas distribution. Catalyst activation was performed using 4 M NaOH at 110°C for 2 hours, followed by calcination at 600°C. The process was conducted at 1 bar with a CO₂ flow rate of 0.05 L/min. Results showed that 260°C provided the best conversion, while 300°C decreased conversion due to equilibrium shifting toward reactants and excessive Zn consumption. An operating time of 120 minutes was optimal, while longer times reduced conversion due to limited Zn reductant. The optimal condition was achieved at 260°C and 120 minutes, yielding the highest CO₂ conversion of 65.59%, with a CH₄ concentration of 63.22% and residual CO₂ of 34.41%.
Co-Authors Erika Dwi Oktaviani Indah Purnamasari Kahfi Ramadhan Muhammad Fikri Ramayanti, Cindi