Therefore, a deeper understanding of the correlations between structure, activity, and selectivity will serve as the foundation for a knowledge-based development of new and enhanced catalysts.
The relationship between catalytic activity and selectivity of cationic sites and their coordination and electronic state, regulated by either thermal treatment or introduction of different anionic ligands, is analyzed.
It was shown that the best compromise between catalyst activity and selectivity requires a low amount of oxygenated groups on the support surface of the final catalyst, typically less than 700 μmol/g CO + CO2 evolved during TPD experiments, together with an optimized platinum particle size ranging between 10 and 20 nm.
Subsequently, the thus obtained model catalyst is used to reveal correlations between lattice oxygen availability, electrical properties, and catalytic activity and selectivity in selective propene oxidation.
To elucidate the relationship between helicity and antifungal activity and selectivity, we replaced ACHC with β-hVal (peptides 17– 21, Figure 1f) or β-hIle (peptides 22– 25, Figure 1g) in the first residue of the repeating trimer.
In this study, analogs of HβD-3 devoid of N and C terminal regions are investigated to determine the influence of specific structural motif on antimicrobial activity and selectivity between Gram-positive and Gram-negative bacteria.
Although both Pd Cu/Al2O3 and Pd Zn/Al2O3 exhibited improved selectivity to styrene compared to monometallic Pd/Al2O3, there is a difference in the activity and selectivity between the two types of bimetallic catalysts at the same Cu/Pd and Zn/Pd molar ratio, which is mainly caused by the different modification degrees of Cu and Zn on Pd.
In particular, strong interactions between the metal active phase and the support ensures stability, activity and selectivity of the catalyst in glycerol steam reforming reactions.
To explore the relationship between β-peptide hydrophobicity and antifungal activity and selectivity in compounds with similar helicity, we varied (i) the N-terminal residue, (ii) the composition of the hydrophobic side groups in the repeating unit, and (iii) the composition of the cationic residue in the repeating unit.
Hydrogen chemisorpThen mainurements indicate that the amount ofeatures adsofbed hydrogen depends on the nature of the base employed in the precatalystsn step.
