Supported Ir–Pd nanoalloys: Size–composition correlation and consequences on tetralin hydroconversion properties

Computational study of the adsorption of benzene and hydrogen on palladium–iridium nanoalloys

“…The FCEM/CBEV lowest energy TO homotops for Pd 4 Ir 34 , Pd 8 Ir 30 and Pd 20 Ir 18 , are studied alongside monometallic Pd 38 and Ir 38 . Although for 38atoms the TO is almost certainly not the global minimum, it is representative of the TO structures seen for larger PdeIr particles [14].…”

“…This is reflected in the structural characteristics of the corresponding nanoalloys [8,9]. PdeIr nanoalloys have been investigated previously for application in a number of catalytic processes [10e16], including tetralin hydroconversion through selective ring opening [14], a process which is key to understanding how to reduce particulate emissions from diesel fuel. Here it was hoped the catalytic properties of each metal would be combined in the nanoalloy catalyst.…”

“…Ir has been shown to be active in CeC bond hydrogenolysis and Pd shows improved hydrogen activation and thioresistance over other noble metal catalysts. [17] Through alloying, depending on the relative proportions of the metals, increased activity and selectivity can be obtained [14].…”

Fabrication of supported Pd–Ir/Al2O3 bimetallic catalysts for 2‐ethylanthraquinone hydrogenation

“…Rocha et al and Ziaei‐azad et al reported that the combination of Pd and Ir increased the activity relative to the corresponding monometallic Pd and Ir catalysts in the hydrogenation of tetralin and indan, respectively. Moreover, a size‐composition correlation has been observed in the formation of Pd–Ir bimetallic catalysts, with the particle size decreasing with the addition of larger amounts of Ir . Very recently, Nakagawa et al reported a remarkable synergistic effect between Pd and Ir in the total hydrogenation of furfural.…”

IrPd nanoalloys: simulations, from surface segregation to local electronic properties

“…Although the bulk immiscible iridium-palladium has been only scarcely studied till now (Tripathi 1991;Turchi 2006;Kolb 2006), a few experimental reports on this system show its actual interest for catalysis (López-De Jésus et al 2010;Shen et al 2010;Piccolo et al 2012). In particular, it has been shown that supported IrPd nanoalloys are more selective than their pure counterparts in the preferential oxidation of CO in hydrogen excess, a reaction used for the elimination of CO impurities in the H 2 production process (Morfin et al 2012;Zlotea et al 2014).…”