Effects of the nature and composition of the solvent on the thermodynamic characteristics of the individual forms of hydrogen adsorbed on the surface of porous nickel

Using solvents to control hydrogen adsorption on skeletal nickel

“…A model surface with discrete heterogeneity to the approximation of an ideal adsorption layer was used to treat the results from adsorption-calorimetric experi ments in [13,14]. The thermodynamic characteristics of the adsorption of individual forms of hydrogen were calculated using this model, i.e., limiting adsorption and adsorption coefficients b i, j .…”

“…The thermodynamic characteristics of the adsorption of individual forms of hydrogen were calculated using this model, i.e., limiting adsorption and adsorption coefficients b i, j . It was found that, , i j m a The relationships between adsorption values and adsorption coefficients b i, j of individual hydro gen forms adsorbed in liquid (s) and gas phase (g) [13,14] are given in Table 5 Table 6.…”

Correlation of Distribution Functions of Hydrogen Adsorption and Disodium Maleate Hydrogenation Activity for the Nickel Catalyst in Aqueous Solution

“…To study hydrogen adsorption, it was proposed to use calorimetry . Ulitin et al . suggested significantly improving the method of taking calorimetric data in order to pay closer attention to the dependence of the hydrogen adsorption heat from a liquid to a metal on various parameters: the effect of the composition of the solvent, the influence of the metal surface state, the hydrogen quantity in the system, etc.…”

“…It is known that the real catalytic active surfaces always have a number of different sites, and different type of energy adsorption bond. Studies of hydrogen adsorption on a transition metal surface from the gas phase showed that the nickel, as well as palladium or platinum metallic catalysts (supported or unsupported ones), has several different forms of adsorbed hydrogen (see Table ). Basically, the methods of TPD, adsorption calorimetry, potentiometry, spectroscopy, quantum chemistry calculations and XPS proved existence of different forms of adsorbed hydrogen over Ni surface …”

“…It was found that over a porous nickel surface (at 273.15÷353.15 K, 1 bar) the hydrogen is adsorbed in three forms: two‐centred molecular α 1 ‐form, single‐centred atomic γ‐ and multi‐centred β 2 − ‐form . The quantity of certain forms depends on the media and the conditions in which the catalyst is located.…”