Login / Signup

Preparation of Well-Defined Double-Metal Cyanide Catalysts for Propylene Oxide Polymerization and CO 2 Copolymerization.

Yeong Hyun SeoMi Ryu LeeDa-Young LeeJun Hyeong ParkHyeon Jeong SeoSang Uk ParkHyunjin KimSeung-Joo KimBun Yeoul Lee
Published in: Inorganic chemistry (2024)
Reevaluating the composition of the double metal cyanide catalyst (DMC) as a salt of (NC) 6 Co 3- anions with 1:1 Zn 2+ /(X)Zn + cations (X = Cl, RO, AcO), we prepared a series of well-defined DMCs, [ClZn + ][Zn 2+ ][(NC) 6 Co 3- ][ROH], [(RO)Zn + ][Zn 2+ ][(NC) 6 Co 3- ], [(AcO)Zn + ][Zn 2+ ][(NC) 6 Co 3- ], [(RO)Zn + ] p [ClZn + ] (1- p ) [Zn 2+ ][(NC) 6 Co 3- ], [(AcO)Zn + ] p [(tBuO)Zn + ] q [Zn 2+ ][(NC) 6 Co 3- ], and [(AcO)Zn + ] p [(tBuO)Zn + ] q [ClZn + ] r [Zn 2+ ][(NC) 6 Co 3- ]. The structure of [(MeOC 3 H 6 O)Zn + ][Zn 2+ ][(NC) 6 Co 3- ] was precisely determined at the atomic level through Rietveld refinement of the synchrotron X-ray powder diffraction data. By evaluating the catalyst's performance in both propylene oxide (PO) polymerization and PO/CO 2 copolymerization, a correlation between structure and performance was established on various aspects including activity, dispersity, unsaturation level, and carbonate fraction in the resulting polyols. Ultimately, our study identified highly efficient catalysts that outperformed the state-of-the-art benchmark DMC not only in PO polymerization [DMC-(OAc/OtBu/Cl)(0.59/0.38/0.15)] but also in PO/CO 2 copolymerization [DMC-(OAc/OtBu)(0.95/0.08)].
Keyphrases
  • heavy metals
  • highly efficient
  • ionic liquid
  • high resolution
  • magnetic resonance imaging
  • magnetic resonance
  • computed tomography
  • machine learning
  • mass spectrometry
  • reduced graphene oxide
  • carbon dioxide
  • dual energy