Park, Kwangho Lee, Kyung Rok Ahn, Sunghee Van Nguyen, Canh Jung, Kwang- Deog 2024-03-13T07:30:04Z 2024-03-13T07:30:04Z 2024-03-13 2024-06 0926-3373 https://pubs.kist.re.kr/handle/201004/149459 This study explores the fabrication and characterization of mesoporous nitrogen -doped carbon replicas (MNCs) as Ru catalyst supports for CO2 hydrogenation to formate. MNC supports with a cubic Ia3d-like structure were successfully synthesized from a KIT -6 template. The mesoporosity, N content, and N states in the MNCs differed according to the precursor type, which substantially influenced the stability of single -atom Ru catalysts during CO2 conversion. In hydrogenation tests, the Ru/MNC prepared using acrylonitrile precursor (Ru/MNC-A) demonstrated the best stability, whereas the Ru/MNCs prepared using pyrrole and melamine exhibited low activity owing to Ru agglomeration and limited reactant diffusion, respectively. The excellent stability of Ru/ MNC-A resulted from Ru migration and rearrangement, as evidenced by near edge X-ray absorption fine structure analyses. Ru/MNC-A and Ru/MNC-A-400 achieved an outstanding turnover number of 69,000 in CO2 hydrogenation over 72 h. Remarkably, the Ru/MNC-A catalyst demonstrated exceptional stability, attaining a TON of 315,840 over 360 h. English Elsevier BV Effects of the chemical states of N sites and mesoporosity of N-doped carbon supports on single-atom Ru catalysts during CO2-to-formate conversion Article 10.1016/j.apcatb.2024.123751 1 Applied Catalysis B: Environment and Energy, v.346 Applied Catalysis B: Environment and Energy 346 N scie scopus 001171809500001 2-s2.0-85182887727 Chemistry, Physical Engineering, Environmental Engineering, Chemical Chemistry Engineering Article CO2 HYDROGENATION FORMIC-ACID DIOXIDE FORMATE FRAMEWORKS METHANOL CO 2 hydrogenation Hydrogen storage Formic acid Formate Heterogeneous catalysis