Nanoparticles carbon monoxide oxidation

Now possibilities of the MC simulation allow to consider complex surface processes that include various stages with adsorption and desorption, surface reaction and diffusion, surface reconstruction, and new phase formation, etc. Such investigations become today as natural analysis of the experimental studying. The following papers [282-285] can be referred to as corresponding examples. Authors consider the application of the lattice models to the analysis of oscillatory and autowave processes in the reaction of carbon monoxide oxidation over platinum and palladium surfaces, the turbulent and stripes wave patterns caused by limited COads diffusion during CO oxidation over Pd(110) surface, catalytic processes over supported nanoparticles as well as crystallization during catalytic processes. 

Frozandeh-Mehr, E., Malekzadeh, A., Ghiasi, M., Gholizadeh, A.. Mortazavi, Y., and Khodadadi, A. (2012) Effect of partial substitution of lanthanum by strontium or bismuth on structural features of the lanthanum manganite nanoparticles as a catalyst for carbon monoxide oxidation. Catal Commun., 28, il- Sl. 

Joo SH et al (2010) Size effect of ruthenium nanoparticles in catalytic carbon monoxide oxidation. Nano Lett 10 2709-2713. doi 10.1021/nll01700j... 

Kuhn JN, Tsung C-K, Huang W, Somorjai GA (2009) Effect of organic capping layers over monodisperse platinum nanoparticles upon activity for ethylene hydrogenation and carbon monoxide oxidation. J Catal 265 209-215... 

Size Effect Under Catalytic Carbon Monoxide Oxidation for Ru Nanoparticles... 

Fig. 9.36 A full oscillation period in CO oxidation at high conversion, the platinum is oxidized (bright spots), while In low conversion, the sample Is reduced (dark spots). (From R. Jensen, T. Andersen, A. Nierhoff, T. Pedersen, O. Hansen, S. Dahl, I. Chorkendorff, Self-sustained carbon monoxide oxidation oscillations on size-selected platinum nanoparticles at atmospheric pressure, Phys. Chem. Chem. Phys. 15 (2013) 2698. From Royal Society of Chemistry).

Dendrimer-protected colloids are capable of adsorbing carbon monoxide while suspended in solution, but upon removal from solution and support on a high surface area metal oxide, CO adsorption was nil presumably due to the collapse of the dendrimer [25]. It is proposed that a similar phenomena occurs on PVP-protected Pt colloids because removal of solvent molecules from the void space in between polymer chains most likely causes them to collapse on each other. Titration of the exposed surface area of colloid solution PVP-protected platinum nanoparticles demonstrated 50% of the total metal surface area was available for reaction, and this exposed area was present as... 

Hayden BE, Pletcher D, Suchsland J-P. 2007. Enhanced activity for electrocatal)4ic oxidation of carbon monoxide on titania-supported gold nanoparticles. Angew Chem Int Ed 46 3530-3532. 

Previous studies in conventional reactor setups at Philip Morris USA have demonstrated the significant effectiveness of nanoparticle iron oxide on the oxidation of carbon monoxide when compared to the conventional, micron-sized iron oxide, " as well as its effect on the combustion and pyrolysis of biomass and biomass model compounds.These effects are derived from a higher reactivity of nanoparticles that are attributed to a higher BET surface area as well as the coordination of unsaturated sites on the surfaces. The chemical and electronic properties of nanoparticle iron oxide could also contribute to its higher reactivity. In this work, we present the possibility of using nanoparticle iron oxide as a catalyst for the decomposition of phenolic compounds. 

P Li, E. J. Shin, D. Miser, M. R. Hajaligol, and F. Rasouli, The catalytic/oxidative effects of iron oxide nanoparticles on carbon monoxide and the pyrolytic products of biomass model compounds, In Nanotechnology in Catalysis, edited by B. Zhou, S. Hermans, and G. A. Somorjai (Kluwer Academic/Plenum Publishers, New York 2004) pp. 515-542. 

Figure 4.1 (a) STM image of gold nanoparticles on a titania crystal surface (b) plot of the catalytic activity of gold nanoparticles versus size in the selective oxidation of carbon monoxide with oxygen to carbon dioxide (c) an artist s rendition of the raft-like shapes of the nanoparticles. 

Alayoglu S, Nilekar AU, Mavrikakis M et al (2008) Ru-Pt core-shell nanoparticles for preferential oxidation of carbon monoxide in hydrogen. Nat Mater 7 333-338... 

Nanoparticles containing Fc203 were prepared by Li [3] and incorporated into cigarette filters as a method of lowering the amount of carbon monoxide and/or nitric oxide in inhaled tobacco smoke. 

An(acac)(Me)2 was nsed by Clans and coworkers to produce silica-supported gold nanoparticles by MOCVD , as a catalyst with Au content of 2.4 wt% and average Au particle size of 1.4 nm, which fits well to other supported gold catalysts prepared from alternative precnrsors by different rontes . The supported nanoparticles were applied as catalyst for low-temperatnre oxidation of carbon monoxide. 

Transition metal catalysts, specifically those composed of iron nanoparticles, are widely employed in industrial chemical production and pollution abatement applications [67], Iron also plays a cracial role in many important biological processes. Iron oxides are economical alternatives to more costly catalysts and show activity for the oxidation of methane [68], conversion of carbon monoxide to carbon dioxide [58], and the transformation of various hydrocarbons [69,70]. In addition, iron oxides have good catalytic lifetimes and are resistant to high concentrations of moisture and CO which often poison other catalysts [71]. Li et al. have observed that nanosized iron oxides are highly active for CO oxidation at low tanperatures [58]. Iron is unique and more active than other catalyst and support materials because it is easily reduced and provides a large number of potential active sites because of its highly disordered and defect rich structure [72, 73]. Previous gas-phase smdies of cationic iron clusters have included determination of the thermochemistry and bond energies of iron cluster oxides and iron carbonyl complexes by Armentrout and co-workers [74, 75], and a classification of the dissociation patterns of small iron oxide cluster cations by Schwarz et al. [76]. 

Li P, Miser DE, Rabiei S, Yadav RT, Hajaligol MR (2003) The removal of carbon monoxide by iron oxide nanoparticles. Appl Catal B Environ 43 151... 

Different electron-conducting polymers (polyaniline, polypyrrole, polythiophene) are considered as convenient substrates for the electrodeposition of highly dispersed metal electrocatalysts. The preparation and the characterization of electronconducting polymers modified by noble metal nanoparticles are first discussed. Then, their catalytic activities are presented for many important electrochemical reactions related to fuel cells oxygen reduction, hydrogen oxidation, oxidation of Cl molecules (formic acid, formaldehyde, methanol, carbon monoxide), and electrooxidation of alcohols and polyols. 

The Pauson-Khand reaction has also been carried out under different conditions, such as the use of chiral ligands, including PuPHOS, CamPHOS, and camphorsultam the use of aldehydes as the carbon monoxide source > the use of solid-supported cobalt catalyst to enhance purification, such as the dry-state adsorption the use of colloidal cobalt nanoparticle and the use of metallic cobalt supported on mesoporous silica prepared by decomposing Co2(CO)8 on mesoporous silica supports (SBA-15 and MCM-41) in the refluxing toluene solution.Other modifications include different promoting methods, such as photo-irradiation, microwave irradiation, molecular sieves, TEMPO,A-oxides, and supercritical fluids. Furthermore, the cycloaddition between allene and carbon monoxide under similar conditions is known as the allenic Pauson-Khand reaction,27,41 jjjg reaction among alkyne, carbodiimide, and CO is referred to as the aza-Pauson-Khand reaction. ... 

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