ZIF‐8 Membrane Permselectivity Modification by Manganese(II) Acetylacetonate Vapor Treatment

Abstract

Vapor‐phase treatment of ZIF‐8 membranes with manganese(II) acetylacetonate (Mn(acac)2) allows permselectivity tuning. Propylene/propane selectivity increases from 31 to 210 after the Mn(acac)2 treatment at 165 °C for 30 min, while selectivities increase from 14.6 to 242 for H2/CH4, from 2.9 to 38 for CO2/CH4, from 2.4 to 29 for CO2/N2, and from 2.9 to 7.5 for O2/N2, after Mn(acac)2 treatment at 175 °C for 30 min. Stable equimolar propylene/propane mixture selectivity of 165 at ambient temperature and 4 bar equimolar feed with a propylene flux of 8.3×10−4 mol m−2 s−1 is established. A control experiment excludes thermal treatment alone causing these changes. XPS analysis reveals the presence of Mn(acac)2 on the outer surface of the vapor‐treated ZIF‐8 membranes while no other changes are detectable by X‐ray diffraction and infrared spectroscopy.

Tuning the Interaction between Ruthenium Single Atoms and the Second Coordination Sphere for Efficient Nitrogen Photofixation

“…Meanwhile, the peak located at 288.7 eV was assigned to the CO species of the residual cobalt acetylacetonate precursor. [ 30 ] The Ru 3d 5/2 peak of Ru O /CoO was located at 280.8 eV, indicating the characteristic oxidation state for Ru single atoms. [ 31 ] Furthermore, the binding energy of the Ru 3d 5/2 peak in Ru O+Co /CoO displayed a negative shift of 0.3 eV compared with Ru O /CoO, suggesting the lower valence of Ru species in Ru O+Co /CoO.…”