Adsorption of isopropanol and cyclohexane on zinc oxide

Effect of the plasma-chemical treatment of ZnO and NiO on their activity in the dehydrogenation of isopropanol

“…The total acidity of oxides determined in [9,10] from the amount of pyridine adsorbed from octane was used to compare catalytic activities. Since the samples were treated at T = 350°C for 3 h, the acid sites were assumed to be mainly Lewis sites.…”

“…The acidity of nickel oxide was shown in [10] to decrease after plasma-chemical treatment, so the change in the catalytic activity of NiO was not due to a change in the number of acid sites. In this case, the Table 3.…”

“…The treatment of zinc oxide with oxygen and argon plasmas was found in [10] to increase the surface acidity of ZnO, determined from the adsorption of pyridine from octane. Figure 3 shows the dependence of the yield of acetone (at T = 593 K) on the number of adsorbed pyridine molecules, i.e., the number of acid sites per 1 cm 2 of ZnO surface.…”

“…The adsorption of CO, CO 2 , and isopropanol on semiconductor Ta 2 O 5 , NiO, and ZnO oxides was studied in [7][8][9][10] along with the influence of plasmachemical treatment on their adsorption characteristics. A change in the total acidity of ZnO and NiO, induced via treatment with glow discharge oxygen plasma and high-frequency (HF) argon plasma, was observed in [9,10].…”

“…A change in the total acidity of ZnO and NiO, induced via treatment with glow discharge oxygen plasma and high-frequency (HF) argon plasma, was observed in [9,10]. The changes in the isosteric heat and entropy of adsorption induced by plasma and the changes in the characteristics of isotherms of adsorption suggest that plasma-chemical treatment might also affect the catalytic activity of oxides.…”