Adsorption of electron acceptors on rare earth oxide catalysts

Detection and Measurement of Surface Electron Transfer on Reduced Molybdenum Oxides (MoOx) and Catalytic Activities of Au/MoOx

“…[7,8] Both the fresh TCNE acetonitrile solution (Figure 1 a) and the suspension solution with the fully oxidized MoO 3 (Figure 1 b) did not show the absorption peak. The molecule has four cyano groups conjugated to the central C = C double bond with low-energy p* orbitals.…”

Palladium nanoparticles supported on CNT functionalized by rare-earth oxides for solvent-free aerobic oxidation of benzyl alcohol

“…4, the background of CV signals are observed with an evident decrease in the area enclosed in the sequence of: 1Pd/5La-CNT > 1Pd/5Ce-CNT > 1Pd/5Sm-CNT ≈ 1Pd/5Gd-CNT > 1Pd/5Er-CNT > 1Pd/5Yb-CNT>1Pd/ CNT. Rare-earth oxides are well known for their surface electron donor properties [54][55][56][57], which favors the enlargement of areas enclosed by CV curves, since the more redox active sites or electron donors on CNT, the larger capacitance and CV background are [58]. The sequence mentioned above is in tune with lanthanide contraction: basicity of rare-earth oxides, which is related to electron donor properties, declines with the contraction of rare-earth cation radius [59].…”

Acid-base, electron donating and catalytic properties of sulfated zirconia

“…The strength distribution of electron donor sites on the oxide surface was determined by the adsorption of the following electron acceptors (EA) in acetonitrile as solvent (the electron affinity values are given in parentheses): 7,7,8,8-tetracyanoquinodimethane (TCNQ, 2.84 eV), 2,3,5,6-tetrachloro-l,4-benzoquinone (chloranil, 2.40 eV), p-dinitrobenzene (PDNB, 1.77 eV) and mdinitrobenzene (MDNB, 1.26 eV). The method for adsorption studies is described elsewhere [7]. The amount of EA adsorbed was determined by UV-visible spectrophotometry and the adsorbed state of EA was studied by EPR spectroscopy (Varian E-112 X/Q band) and reflectance spectra (Shimadzu UV-160A UV-visible spectrophotometer with a 200-053 reflectance attachment).…”