2021
DOI: 10.1016/j.cej.2020.127999
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Supported iridium catalysts for the total oxidation of short chain alkanes and their mixtures: Influence of the support

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Cited by 15 publications
(7 citation statements)
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“…Oxidation is known to bring Ir from the core to the surface of bimetallic Pt–Ir nanoparticles to form an IrO x shell, as oxygen adsorbs more strongly and dissociates more readily on Ir than on Pt . IrO x is also known to be highly active for oxidation of short chain alkanes, which would facilitate CO formation and reduce IrO x sites to form metallic Ir bound to CO . The relative intensity of the peak at 2068 cm –1 compared to that at 1989 cm –1 indicates that butane oxidation to CO is the primary surface reaction that occurs during butane + Ar exposure, resulting in a reduced nanoparticle surface that consists of primarily metallic Ir bound to CO. CO is a known poison of metal catalysts, and its desorption from Ir nanoparticles occurs at temperatures >673 K. , Therefore, the formation of a high surface coverage of CO on a predominantly Ir surface is likely responsible for the decreased catalytic activity following butane + Ar regeneration, which was slowly recovered as CO eventually desorbed under butane hydrogenolysis reaction conditions (Figure c).…”
Section: Resultsmentioning
confidence: 99%
“…Oxidation is known to bring Ir from the core to the surface of bimetallic Pt–Ir nanoparticles to form an IrO x shell, as oxygen adsorbs more strongly and dissociates more readily on Ir than on Pt . IrO x is also known to be highly active for oxidation of short chain alkanes, which would facilitate CO formation and reduce IrO x sites to form metallic Ir bound to CO . The relative intensity of the peak at 2068 cm –1 compared to that at 1989 cm –1 indicates that butane oxidation to CO is the primary surface reaction that occurs during butane + Ar exposure, resulting in a reduced nanoparticle surface that consists of primarily metallic Ir bound to CO. CO is a known poison of metal catalysts, and its desorption from Ir nanoparticles occurs at temperatures >673 K. , Therefore, the formation of a high surface coverage of CO on a predominantly Ir surface is likely responsible for the decreased catalytic activity following butane + Ar regeneration, which was slowly recovered as CO eventually desorbed under butane hydrogenolysis reaction conditions (Figure c).…”
Section: Resultsmentioning
confidence: 99%
“…The binding energies obtained for Pd 3d 5/2 were characteristic of Pd 0 (335.2 eV) and Pd 2+ (336.9 eV) in fresh Pd7Ir2/AC-B, and Ir 4+ species (Ir 4+ 4f 7/2 62.1 eV) and Ir metal (Ir 0 4f 7/2 60.8 eV) were both detected over fresh Pd7Ir2/AC-B. [50][51][52][53] Nevertheless, the Pd 0 signal was higher than the Pd 2+ signal on the surface of the fresh sample, and the Ir 0 signal was much weaker than that of Ir 4+ species. In addition, the Pd 3d and Ir 4f signals on spent Pd7Ir2/AC-B were greatly weakened or even vanished, which was induced by severe carbon deposition on the sample surface and is discussed later. )…”
Section: Catalysis Science and Technology Papermentioning
confidence: 91%
“…In this study, we employed a synergistic combination of first-principles calculations within the framework of the DFT and low voltage operated fifth-order-aberration-corrected STEM ( C 5 -corrected STEM) to systematically predict and investigate the dynamics of Co, Ni, Ir, and Ta decorated monolayer h-BN. The selected TMs have been theoretically explored with a few experimental works confirming their potential application in engineering h-BN electronic properties such as band gap reduction and induction of magnetic moment. A few studies have also shown that Ta single atoms can be used instead of the expensive precious TMs like Pt and Au to decorate 2D materials for various catalytic applications. , Notably, the TMs in this study have a high Z-number compared with the substrate host elements (N and B), making them feasibly identifiable with low-angle annular dark-field (LAADF-STEM) imaging technique. In addition, previous theoretical investigations have shown that TMs exhibit strong hybridization with h-BN, further corroborating our selected TM candidates for decorating h-BN …”
mentioning
confidence: 87%