Defects controlled by acid-modulators and water molecules enabled UiO-67 for exceptional toluene uptakes: An experimental and theoretical study

Mass transfer of toluene in a series of metal–organic frameworks: molecular clusters inside the nanopores cause slow and step-like release

“…35 The determined activation energy for the release is significantly larger than the activation energy for the toluene desorption at low loadings. 54 There, the toluene was adsorbed at a vapor pressure of 1 mbar (instead of 30 mbar, here) and an activation energy for the toluene desorption of 8.8 kJ mol −1 was determined. 54 Thus, we come to the conclusion that the step-like release of toluene from UiO-67 is caused by the break-up of the toluene dimers.…”

“…54 There, the toluene was adsorbed at a vapor pressure of 1 mbar (instead of 30 mbar, here) and an activation energy for the toluene desorption of 8.8 kJ mol −1 was determined. 54 Thus, we come to the conclusion that the step-like release of toluene from UiO-67 is caused by the break-up of the toluene dimers. This means, the release kinetics are controlled by the dimer-dissolution, rather than by molecular (Fickian) transport diffusion.…”

Activated Carbons Obtained from Orange Peels, Coffee Grounds, and Sunflower Husks—Comparison of Physicochemical Properties and Activity in the Alpha-Pinene Isomerization Process

“…Type I isotherms are characteristic for microporous materials [ 85 ]. Zhang et al [ 86 ] and Yang et al [ 87 ] also received similar I type isotherms which were characteristic for microporous materials.…”

Regulation of Active Oxygen Species in Cu-MnOx through MOF Templates for Soot Removal

“…In recent years, metal–organic framework (MOF) materials have been widely used in adsorption, photocatalysis, catalysis, and many other fields due to their unique performance advantages, such as controllable pore size, pore surface modification, low density, and large specific surface area. , Compared with traditional methods such as the co-precipitation method and sol–gel method, the catalysts obtained by heat treatment of MOF precursors can have a large amount of defects at the grain boundary and then high abundance of active oxygen species and larger specific surface area. Wang and his co-workers successfully realized the aliovalent substitution of Cu in the Ce lattice through the CeCuO x catalyst derived from bimetallic MOFs, which generated lattice defects and active oxygen, showing a high oxygen storage capacity.…”

“…Furthermore, the synergistic effect of bimetallic MOFs derivatives resulting from the electron transfer between Mn and Cu (Cu 2+ + Mn 3+ ⇌ Mn 4+ + Cu + ) is profitable to the formation of surface active oxygen and Mn 4+ , 13 showing excellent catalytic activity. 14 In recent years, metal−organic framework (MOF) materials have been widely used in adsorption, 15 photocatalysis, 16 catalysis, 17 and many other fields due to their unique performance advantages, such as controllable pore size, pore surface modification, low density, and large specific surface area. 18,19 Compared with traditional methods such as the coprecipitation method 20 and sol−gel method, 21 obtained by heat treatment of MOF precursors can have a large amount of defects at the grain boundary and then high abundance of active oxygen species 22 and larger specific surface area.…”