Thermodynamic characteristics of hydrogen adsorbed on partially deactivated skeletal nickel catalyst in aqueous sodium hydroxide solutions

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

“…The more peak is located to the left in the energy density diagram for the adsorbed hydrogen, the higher the catalyst activity in the studied reaction. This is in good agreement with the data obtained by the Bartholomew's method (see Figure 2 on page 20 in) and does not contradict to the previously obtained data . To reduce various classes of organic compounds (for example, from R‐NO 2 to R‐NH 2 ) requires hydrogen with high binding energies.…”

“…The catalyst activities A indicated on the top of the peaks in Figure were derived from plots in Figure S7 by equations (S1)–(S3), see also Table S1 in Supporting Information. As follows from, the shift of a peak to the left in the distribution functions of hydrogen adsorbed on a catalyst surface indicates an increase in the fraction of the loosely bound hydrogen; the latter is active in the carbon‐carbon double bond hydrogenation. For the unmodified catalyst sample, Figure (a), the increase in a concentration of alkali from 0.01 m to 0.1 m causes a shift of the adsorption equilibrium towards the loosely bound forms of adsorbed hydrogen.…”

“…Sulfides are well known poisons of catalytic systems . The authors showed that the poisoning of nickel catalysts by sulfide ions does not change the energy characteristics of adsorbed hydrogen. Bartholomew demonstrated three types of a deactivation (by sulfide as well): selective, antiselective and non‐selective.…”