Oh, Eunchae Kim, Jeonga Jang, Jaewon Lee, Nodo Sah, Jaehoon Jeong, Harok Lee, Sang Won Kim, Dong Young Jeon, Seung-Yeol Kim, Byung-Joo Yang, Junghoon Kim, Jungpil 2024-12-06T10:00:17Z 2024-12-06T10:00:17Z 2024-12-06 2024-12 0887-0624 https://pubs.kist.re.kr/handle/201004/151304 Converting carbon dioxide (CO2) to carbon nanotubes (CNTs) is economically advantageous due to the high cost of CNTs. However, the one-step conversion of CO2 to CNTs compromises their quality owing to the oxidizing nature of CO2. We synthesized single-walled CNTs (SWCNTs) from CO2 via a two-step tandem process. CO2 was converted to methane (CH4) using a Ni/SiO2 catalyst with various Ni contents, achieving a CH4 selectivity of >96.0% at 300 degrees C on 30 wt % Ni/SiO2. Subsequently, CNTs were produced from the mixed gas consisting of 12.1% CH4, 4.2% CO2, 5.8% CO, 36.2% H-2, and 41.7% carrier gas using Fe-Mo/MgO catalyst at temperatures of 700-900 degrees C. High-yield CNTs were produced from the mixed gas, as demonstrated by analysis of CH4 conversion rate and CNTs yield at different reaction temperatures. The temperature increase enhanced the CNTs crystallinity, reducing their diameter and the number of walls. Electrochemical diagnostic analysis reveals the synthesis of a higher proportion of SWCNTs at 900 degrees C. The proposed approach demonstrates a promising strategy for high-value CO2 utilization. English American Chemical Society Tandem Thermocatalytic Reaction for CO2 Fixation into Single-Walled Carbon Nanotubes Article 10.1021/acs.energyfuels.4c04096 1 Energy & Fuels, v.38, no.23, pp.22974 - 22985 Energy & Fuels 38 23 22974 22985 N scie scopus 001361072100001 2-s2.0-85209930465 Energy & Fuels Engineering, Chemical Energy & Fuels Engineering Article CHEMICAL-VAPOR-DEPOSITION REDUCTION DIOXIDE METHANE GAS NANOPARTICLES ACTIVATION CONVERSION HYDROGEN NI(111)