Ustrated in Figure rCO2 and shows the time-dependent variation in the CO2 and CH4 i.e., mol/gIr ); the corresponding H2 /CO molar ratios are depicted in of inset phase, i.e., rates of consumption, rCO2 and rCH4, respectively (normalized per masstheactiveof Figure 5. It was identified corresponding H2/CO molar ratios are depicted inside the inset be discussed mol/gIrs); the that all catalysts exhibited extremely great TOS stability. As will of Figure 5. It beneath, this that all catalysts Ir catalysts might be principally attributed to be discussed beneath, was located good stability of exhibited quite excellent TOS stability. As will their low propensity for great deposition. catalysts beneath the strongly reducing environment of DRM (i.e., thiscarbonstability of IrMoreover,is usually principally attributed to their low propensity for CO H2 reformate), it is anticipated the iridium lowering present in its metal (i.e., Ir0 carbon deposition. Additionally, underthat strongly would beenvironment of DRMstate, CO, which, accordingit isthe literature, isiridium could be presentto sintering [69]. Each which, H2 reformate), to anticipated that pretty steady and resistant in its metal state, Ir0, factors contribute for the outstanding is extremely steady and resistant to sintering [69]. Both things as outlined by the literature,TOS stability exhibited by Ir-based catalysts under DRM. con-tribute for the fantastic TOS stability exhibited by Ir-based catalysts under DRM. As could be observed in the inset of Figure five, the H2/CO molar ratio on the catalysts was in all cases much less than 1.0 and stable versus time-on-stream. At first glance, this shows that the rWGS reaction (R.four) also occurs beneath these situations, resulting in a lower in the H2/CO molar ratio to values decrease than 1 corresponding to the stoichiometry on the DRM reaction (R.1) [23]. However, H2/CO molar ratio decreases within the order Ir/-Al2O3 Ir/ACZ Ir/CZ based on the supporting material utilized. This reflects the increasingdiscrepancy among CO2 and CH4 consumption prices, the former varying in the opposite sense towards the H2/CO molar ratios. The systematic improve within the relative CO2 conversion with 3-Chloro-5-hydroxybenzoic acid custom synthesis rising the OSC of your assistance (OSCAl2O3 = 0 molO2/g OSCACZ = 110 molO2/g OSCCZ = 557 molO2/g), as well as the concomitant increase in CO formation relative to H2, Nanomaterials 2021, 11,indicates the occurrence of support-induced modifications in the Ir surface chemistry. 2880 This concern is discussed under in connection with all the intrinsic activity data.12 ofFigure 5. CH4 and CO2 consumption rates and also the corresponding H2 /CO molar ratios (inset) obtained using the fresh Figure five. CH4 and CO2 consumption DMPO Chemical prices and the corresponding H2/CO molar ratios (inset) obIr/-Al2 O3 , Ir/ACZ and Ir/CZ catalysts as a function of time-on-stream at T = 750 C and equimolar feed composition tained with all the fresh Ir/-Al2O3, Ir/ACZ and Ir/CZ catalysts as a function of time-on-stream at T = ([CH4 ]in = [CO2 ]in = and equimolar stress of 1 bar). Other = [CO2]in = 50 at a total stress of 1 cat ; Other mass 750 50 at a total feed composition ([CH4]in conditions: WGHSV = 120,000 mL/g bar). catalyst wcat = 50 mg. Open symbols and dashed lines indicate CH4 consumption = 50 mg. Open symbols and dashed indicate CO2 conditions: WGHSV = 120,000 mL/gcath; catalyst mass wcat rates; filled symbols and solid lines lines consumption prices for Ir/-Al2 O3 (triangles), Ir/ACZsymbols and strong lines indicate CO2 consumption prices for indicate CH4 consumption prices; filled (sq.