title: Design of Zeolitic Imidazolate Framework Derived Nitrogen-Doped Nanoporous Carbons Containing Metal Species for Carbon Dioxide Fixation Reactions.
abstract: Various N-doped nanoporous carbons containing metal species were prepared by direct thermal conversion of zeolitic imidazolate frameworks (ZIFs; ZIF-7, -8, -9, and -67) at different temperatures (600, 800, and 1000 °C). These materials were utilized as bifunctional acid-base catalysts to promote the reaction of CO2 with epoxides to form cyclic carbonates under 0.6 MPa of CO2 at 80 °C. The catalyst generated by thermal conversion of ZIF-9 at 600 °C (C600-ZIF-9) was found to exhibit a higher catalytic activity than the other ZIFs, other conventional catalysts, and other metal-organic framework catalysts. The results of various characterization techniques including elemental analysis, X-ray diffraction, X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, and transmission electron microscopy show that C600-ZIF-9 contains partly oxidized Co nanoparticles and N species. Temperature-programmed desorption measurements by using CO2 and NH3 as probe molecules revealed that C600-ZIF-9 has both Lewis acid and Lewis base catalytic sites. Finally, the substrate scope was extended to seven other kinds of epoxides.
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1, Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Toyao
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1, Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan.
authors.forename: Mika
authors.initials: M
authors.lastname: Fujiwaki
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1, Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan.
authors.forename: Kenta
authors.initials: K
authors.lastname: Miyahara
authors.affiliation: Division of Mechanics and ICT Convergence Engineering, Sun Moon University, GalSan-Ri, Tangjung-Myon, Asan Chung-nam, 336708, Republic of Korea.
authors.forename: Tae-Ho
authors.initials: TH
authors.lastname: Kim
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1, Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan. horiuchi@chem.osakafu-u.ac.jp.
authors.forename: Yu
authors.initials: Y
authors.lastname: Horiuchi
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1, Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan. matsumac@chem.osakafu-u.ac.jp.
authors.forename: Masaya
authors.initials: M
authors.lastname: Matsuoka
mesh_terms: D002244:Carbon / Q000737:chemistry*; D002245:Carbon Dioxide / Q000737:chemistry*; D002254:Carbonates / Q000138:chemical synthesis / Q000737:chemistry; D002384:Catalysis; D007093:Imidazoles / Q000737:chemistry*; D036103:Nanotechnology; D009584:Nitrogen / Q000737:chemistry*; D016062:Porosity; D017641:Zeolites / Q000737:chemistry*
chemical_list: D002254:Carbonates; D007093:Imidazoles; D017641:Zeolites; D002245:Carbon Dioxide; D002244:Carbon; D009584:Nitrogen
keywords: carbon dioxide fixation; cyclic carbonate synthesis; doping; nanostructures; zeolitic imidazolate framework