Thermodynamics of Proton Binding at the Alumina/Aqueous Solution Interface. A Phenomenological Approach

Review on nanoperovskites: materials, synthesis, and applications for proton and oxide ion conductivity

“…The physisorption reaction dominantly takes place at lower temperatures (<100°C), and the chemisorption reaction dominantly takes place at higher temperatures (>100°C). This behavior has been reported in many metal oxides, including Al 2 O 3 , TiO 2 , SiO 2 , and Fe 2 O 3 , by forming single or multiobserved water layers [108][109][110].…”

On derivatives of surface charge curves of minerals

“…A recent paper [12] dealt with a procedure similar to that of Schwarz and co-workers [13,14]. The present author has some reservations about the tentative derivation of pK values of surface functional groups based on potentiometric titration curves.…”

“…In similar derivative analyses, when applied to humic substances, electrostatic effects were a priori filtered out by generating an ionic strength-independent master curve. The previous attempts with mineral surfaces were done on raw charging curves [13,14] and it was argued that the titration curves did not show significant ionic strength effects and thus electrostatics could be neglected. This, however, strongly contradicts the bulk of oxide titration curves at different background electrolyte concentrations.…”

The Phenomena of Proton Transfer from Catalytic Oxides

“…Although the picture of a heterogeneous distribution of proton-binding sites at the oxide/water interface pre-existed in the literature (28) and methods for an a priori prediction of the point of zero charge (39) and proton-binding constants (40) have been previously proposed, this was the first time that the pK spectrum of an oxide surface was measured and the result confirmed and complemented earlier theoretical predictions. Since then proton transfer at the surface of various solid samples, including catalyst supports (41,42), doped supports (43), supported oxides (44), mixed oxide xerogels (45), and aerogels (46) was explored. Two levels of analysis have been applied.…”