A Molecular Beam Study of the NO + CO Reaction on Pd(111) Surfaces

Thirunavukkarasu, Kandasamy; Thirumoorthy, Krishnan; Libuda, Jörg; Gopinath, Chinnakonda S.

doi:10.1021/jp050478v

Cited by 62 publications

(72 citation statements)

References 43 publications

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“…At the same time, the NO can also adsorb on the cerium or copper species forming the diazo compounds N2O2 2− (1346 cm −1 ) (Equations (4) and (5)) [16,43]. The CO can also adsorb on the highly dispersed Cu + species (2109 cm −1 ) (Equation (6)) that can react with diazo compounds N2O2 2− to produce CO2 and N2O (Equations (7) and (8)) above 100 °C, as shown in Figure 6b. The N2O is further reduced to N2 by the Cu + -CO along with the formation of CO2 (Equation (9)).…”

Section: Drifts Studiesmentioning

confidence: 99%

“…For the currently-reported technologies of NO x abatement, the reduction of NO by CO occurring over three-way catalysts (TWCs) has attracted tremendous attention due to the simultaneous conversion of CO and NO. Noble metal catalysts (Rh, Pt and Pd) have been used in the reaction of NO + CO [2][3][4][5][6][7][8][9], due to their high activity and selectivity for NO reduction. Because of the scarcity and high price of Rh, Pt has been considered to be a better catalytic candidate for the catalytic reduction of NO.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Surface Copper Species on NO + CO Reaction over xCuO-Ce0.9Zr0.1O2 Catalysts: In Situ DRIFTS Studies

Yuan

et al. 2016

Catalysts

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Abstract:In this work, the activity of xCuO-Ce 0.9 Zr 0.1 O 2 catalysts for the reaction of NO + CO was investigated. Especially, in situ DRIFTS was applied to investigate the surface species under the adsorption of NO and/or CO and the reaction of NO and CO to understand the key intermediates species and reaction process of NO + CO. The results suggest that the copper oxide species are well dispersed on the surface of the catalysts, which can be easily reduced to form Cu + species. The Cu + species are proposed to be important activity species. The results of this work also suggest that N 2 O 2 2− is likely an intermediate species that plays an important role in NO reduction by CO. Thus, more Cu + and highly dispersed copper oxide species are expected to be beneficial for the reaction of CO + NO over the xCuO-Ce 0.9 Zr 0.1 O 2 catalysts.

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Section: Drifts Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Surface Copper Species on NO + CO Reaction over xCuO-Ce0.9Zr0.1O2 Catalysts: In Situ DRIFTS Studies

Yuan

et al. 2016

Catalysts

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“…Nitric oxide reduction with CO on the Pd(111) surface has been studied in [12]. Subsequent temperature programed desorption (TPD) measurements are performed in order to determine the nitrogen coverage under steadystate conditions.…”

Section: Introductionmentioning

confidence: 99%

Sol-gel Ag + Pd/SiO2 as a catalyst for reduction of NO with CO

et al. 2006

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Mono -(Ag/SiO 2 , Pd/SiO 2 ) and bimetallic (Ag+Pd/SiO 2 ) catalysts have been obtained via sol-gel method from tetra-ethoxysilane (TEOS) and their activity in reduction of Nitric oxide (NO) with carbon monoxide (CO) has been investigated. The highest activity in the process of reduction of NO with CO possesses the sample Ag+Pd/SiO 2 . It has been found that the sol-gel method for preparation of bimetallic catalysts allows the formation of various catalytic active centers (CAC) which leads to high activity in reaction of NO reduction. The presence of Ag 2 O and PdO in these CAC allows the elimination of NO. The process of this elimination includes reduction of NO with CO at temperatures up to 200°C as well as direct decomposition of NO at higher temperatures.

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“…Only minor CO-displacement was observed for 1:15 NO:CO beam. CO displacement effect by NO on Pd(111) was observed up to 475 K [32]. At temperatures ‡525 K the displacement effect was very poor or not observed due to the very small steady state coverage of the reactants, particularly CO.…”

Section: Transient Kinetics-displacement Of Co Ads By Nomentioning

confidence: 97%

Fabrication of an Effusive Molecular Beam Instrument for Surface Reaction Kinetics—CO Oxidation and NO Reduction on Pd(111) Surfaces

Thirunavukkarasu

Gopinath

2007

Catal Lett

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A simple molecular beam instrument (MBI) was fabricated for measuring the fundamental parameters in catalysis such as, sticking coefficient, transient and steady state kinetics and reaction mechanism of gas/vapor phase reactions on metal surfaces. Important aspects of MBI fabrication are given in detail. Nitric oxide (NO) decomposition and NO reduction with carbon monoxide (CO) on Pd(111) surfaces were studied. Interesting results were observed for the above reactions and they support the efficiency of the MBI to derive the fundamental parameters of adsorption and catalysis. Sustenance of CO oxidation at 400 K is dependent mostly on the absence of CO-poisoning; apparently, CO + O recombination is the rate determining step £400 K. NO adsorption measurements on Pd(111) surface clearly indicating a typical precursor kinetics. Displacement of the chemisorbed CO by NO on Pd(111) surfaces was observed directly with NO + CO beams in the transient kinetics. It is also relatively easy to identify the rate-determining step directly from the MBI data and the same was demonstrated for the above reactions.

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A Molecular Beam Study of the NO + CO Reaction on Pd(111) Surfaces

Cited by 62 publications

References 43 publications

Effect of Surface Copper Species on NO + CO Reaction over xCuO-Ce0.9Zr0.1O2 Catalysts: In Situ DRIFTS Studies

Effect of Surface Copper Species on NO + CO Reaction over xCuO-Ce0.9Zr0.1O2 Catalysts: In Situ DRIFTS Studies

Sol-gel Ag + Pd/SiO2 as a catalyst for reduction of NO with CO

Fabrication of an Effusive Molecular Beam Instrument for Surface Reaction Kinetics—CO Oxidation and NO Reduction on Pd(111) Surfaces

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