Monolayer oxides

Andreaus B, Maillard F, Kocylo J, Savinova ER, Eikerling M. 2006. Kinetic modeling of COad monolayer oxidation on carbon-supported platinum nanoparticles. J Phys Chem B 110 21028-21040. 

Friedrich KA, Henglein F, Stimming U, Urrkauf W. 2000. Size dependence of the CO monolayer oxidation on nanosized Pt particles supported on gold. Electrochim Acta 45 3283-3293. 

Maillard F, Fikerling M, Cherstiouk OV, Schreier S, Savinova FR, Stimnting U. 2004a. Size effects on reactivity of Pt nanoparticles in CO monolayer oxidation The role of surface mobility. Faraday Discuss 125 357-377. 

Maillard F, Schreier S, Hanzhk M, Savinova FR, Weinkauf S, Stimnting U. 2005. Influence of particle agglomeration on the catalytic activity of carbon-supported Pt nanoparticles in CO monolayer oxidation. Phys Chem Chem Phys 7 385-393. 

Cherstiouk OV, Simonov PA, Zaikovskii VI, Savinova ER. 2003b. CO monolayer oxidation at Pt nanoparticles supported on glassy carbon electrodes. J Electroanal Chem 554 241-251. 

Maillard F, Savinova ER, Stimming U. 2007b. CO monolayer oxidation on Pt nanoparticles Further insights into the particle size effects. J Electroanal Chem 599 221-232. 

Solla-Gullon J, Vidal-Iglesias FJ, Rodriguez P, Herrero E, Feliu JM, Aldaz A. 2005. Shape-dependent electrocatalysis CO monolayer oxidation at platinum nanoparticles. Paper presented at Meeting ECS, May 15-20, 2005, Quebec City. 

Type 3. In this category dissociation of the water molecule is only partial and surface OH species dominate. Cobalt is an example (67). Iron appears (6S) to form a mixed oxyhydroxide adlayer analogous to FeO OH. This renders the surface unreactive to further attack by 02(g), even though it is estimated to be no more than a single monolayer. Oxidation of iron by 02(g) is well known to be multilayer at 295 K. Similar data have also been reported by Gimzewski et al. 69) with iron. 

Another difference between bulk and monolayer oxidations was observed in the amounts of alkanes and alkenes produced. In bulk, the alkanes in ethyl palmitate heated for 1 hr at 180°C were greater than the 1-alkenes, indicating that hydrogen abstraction is the preferred route for termination of the alkyl radicals which are formed by hydroperoxide scission. The reverse was true in the ordered state. Restriction of the alkyl radicals limits abstraction of hydrogen from other substrate molecules to form alkanes thus favoring the production of 1-alkenes (Hau, L. B. Nawar, W. W. University of Massachusetts, Amherst, unpublished data). 

For most of the oxide-supported monolayer oxides (e.g. vanadia, molybdena and tungsta supported on alumina), titania, zirconia and silica surface species are... 

Figure 15 Current transients of potentiostatic CO monolayer oxidation in 0.1moldm HCIO4 for Ru/Pt(lll) (rRu = 0.25) and Pt(lll) at oxidation potentials of 0.45 V < iiox 0.6 V. For the two faster transients, data from different electrodes with the same preparation are superimposed in order to indicate the reproducibility. (From Ref. 110.)...

In this work, a concept of the modification of platinum catalysts is presented. According to our proposal, the monolayer oxide systems should be the appropriate carriers that can influence the noble metal properties. The monolayer carrier effect depends on its acid-base or electro-nucleophilic properties and the number and capacity of monolayers. This is of great importance in the selective hydrogenation of unsaturated carbonyl compounds. The... 

The results of unsaturated carbonyl compounds hydrogenation in the presence of metal oxide - monolayer oxide - platinum (Pt loading 2 %) catalysts are collected in Table 3 (Pt from H2PtCl6) and Table 4 (Pt from Pt(acac)2). In all the cases, the selectivity of the platinum catalysts deposited on supports modified with transition metal oxide monolayers... 

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