Ispersion of Ir Mouse custom synthesis crystallites on the supports caused a rise within the

Ispersion of Ir Mouse custom synthesis crystallites on the supports caused a rise within the H2 consumption Dispersion of Ir crystallites on the supportsO , Ir/ACZ and Ir/CZ catalysts, which take (Figure 2b) and also the t-OSC of your Ir/-Al2 caused an increase within the H2 consumption 3 (Figure 2b) plus the t-OSC 601 ol O /g 3, Ir/ACZ and Ir/CZ catalysts, which take values values of 38, 176 and of the Ir/-Al2Ocat , respectively. The observed increase in the t-OSC two of 38, 176 and 601 mol the/gcat, respectively. The observedthat corresponding for the IrO values obtained for O2 metallized samples is close to raise within the t-OSC values Ir0 reduction with the Ir content material of the catalysts (52 ol O2 /gcat for 1 wt of Ir). Moreover, by comparing the H2 -TPR profiles of supports and counterpart catalysts, it is apparentNanomaterials 2021, 11, x FOR PEER REVIEWNanomaterials 2021, 11,ten of10 ofobtained for the metallized samples is close to that corresponding towards the IrO2 Ir0 reduction with the Ir content material from the catalysts (52 mol O2/gcat for 1 wt of Ir). Additionally, by comparing the H2-TPR profiles ceria was substantially favored in the presence of Ir sincethe that the reducibility in the of supports and counterpart catalysts, it is Olesoxime Autophagy actually apparent that all reducibility of the ceria was substantially favored in the presence of Ir have all hydrogen hydrogen consumption peaks attributed to Ce4 Ce3 reduction because been shifted consumption peaks attributed to Ce4 Ce3 10050 C; Figure 2b). This phenomenon is toward significantly lower temperatures (ca. reduction have already been shifted toward significantly lowerin the literature(ca. 10050 ; Figure 2b).the strong promotion of hydrogen well known temperatures and has been attributed to This phenomenon is well-known in the literature and hasparticles, within the to the strongwhich the method is restricted by H2 spillover by the metal been attributed absence of promotion of hydrogen spillover by the metal particles, within the absence of which the course of action is limited by H2 dissociation [81]. dissociation [81]. The metal dispersions and corresponding nanoparticle sizes of the Ir/-Al2 O33,Ir/ACZ dispersions and corresponding nanoparticle sizes in the Ir/-Al2O , Ir/ACZ and Ir/CZ catalysts estimated by means in the H2-chemisorption measurements are inIr/CZ catalysts estimated by means of 2 -chemisorption measurements are integrated in Table 1. As could be noticed, the impregnation process employed for iridium disperbe seen, the impregnation approach employed for iridium dispersion on the supports accomplished quite superior dispersions (ca. 400 , Table 1) and modest Ir 400 , Table crystallite sizes (ca. 1.0.7 nm) irrespective on the kind and surface area with the help. crystallite sizes 1.0.7 nm) irrespective on the kind and surface area of support. The uniform distribution of Ir particles on the support surface and their compact sizes were corroborated by HR-TEM measurements as shown in the representative HR-TEM pictures of Figure 3.Figure 3. HR-TEM pictures and corresponding particle size distributions of the freshfresh (a) Ir/-Al2 O3 , (b) Ir/ACZ and HR-TEM images and corresponding particle size distributions of the (a) Ir/-Al2O3, (b) Ir/ACZ and (c) Ir/CZ catalysts. (c) Ir/CZ catalysts.Figure four shows representative PXRD data for the 3 fresh catalysts. Reflections the 3 fresh catalysts. Reflections corresponding to Ir particles, usually expected at 2 = 40.7, 47.3 and 69.1 C [74], were expected corresponding not detected on account of the fairly little size of those nanopartic.