The Conversion of CO2 to Methanol With Electrochemical Reduction Methods Dedi Rohendi1,2*, Nirwan Syarif 1,2, Addy Rachmat1,2 , Dewi Mersitarini3, Dimas Ardiyanta3, RR. Whiny H. Erliana3, Isya Mahendra3, Dwi Hawa Yulianti2, Nyimas Febrika S2, Icha Amelia2, M. Ilyas Izzudin1, Balqis Hayati1
1 Universitas Sriwijaya, Faculty of Mathematic and Natural Sciences, Department of Chemistry, Jl. Palembang-Prabumulih Km 32, Indralaya, Ogan Ilir, Indonesia
2 Univesitas Sriwijaya, Center of Research Excellent in Fuel Cell and Hydrogen, Jl. Srijaya Negara, Palembang, Indonesia
3 CCUS Research, Upstream Research & Technology Innovation - PT Pertamina (Persero)
Abstract
The Conversion of CO2 to Methanol With Electrochemical Reduction Methods is carried out as an effort to reduce CO2 emissions. The method of converting CO2 to methanol that is currently being developed is an electrochemical reduction method using a membrane electrode assembly (MEA) as the reaction center. MEA consists of a Nafion-117 electrolyte membrane and two electrodes in the form of a cathode and anode. The metal catalyst Cu2O-ZnO/C was used as the active site of the cathode and the metal catalyst Pt/C as the active site of the anode. Specific parameters that are considered in this study are the applied voltage conditions of 0.6- 0.8- 1.0- 1,2- 1.4- 1.6- 1.8- 2.0(V), CO2 flow rate 60- 80- 100- 120- 140- 160 (mL/min) on single stack and 120- 160- 200- 240 (mL/min) on dual-stack and operating times of 2, 4, 6, 8 (hours). The maximum methanol percentage was obtained at a voltage condition of 1.8 V (17.72 % w/v). A voltage of 1.8 V is used in the conversion process with varying flow rates to produce methanol with the highest percentage at a flow rate of 120 mL/minute (34.34% w/v) in a single stack and 160 mL/minute (39.30 %w/v). ) on the double stack. In addition, the operating time with a duration of 8 hours showed the percentage of methanol in a double stack (42.62% w/v) and multi-stack (45.36 % w/v). Conversion of CO2 with increasing operating time results in a decrease in Faraday efficiency due to the heat generated in the electrolyzer. Faraday efficiency for double stack and multi-stack (1.8 V- 160 mL/min- 8 hours) has a value of 33.47 % and 15.84 %, respectively.
Keywords: CO2, Methanol, Cu2O-ZnO/C, Electrochemical Reduction, MEA
