DRIFTS studies on CO and NO adsorption and NO+CO reaction over Pd2+-substituted CeO2 and Ce0.75Sn0.25O2 catalysts

Baidya, Tinku; Bera, Parthasarathi; Mukri, Bhaskar Devu; Parida, Sanjit Kumar; Kröcher, Oliver; Elsener, Martin; Hegde, M. S.

doi:10.1016/j.jcat.2013.03.020

Cited by 68 publications

(45 citation statements)

References 55 publications

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“…6a). In addition to that a small shoulder at around 2152 cm −1 can be observed after this first reduction step which can be explained by linearly adsorbed CO on some little amounts of residual, not yet reduced PdO that appears at 2150-2160 cm −1 according to literature [29,[31][32][33][34][35][36][37]. After 473 K reduction, the signal for adsorbed CO decreased to less than 10% (Fig.…”

Section: Drifts Surface Investigationmentioning

confidence: 65%

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CO oxidation as a test reaction for strong metal–support interaction in nanostructured Pd/FeO powder catalysts

Kast

Friedrich

Teschner

et al. 2015

Applied Catalysis A: General

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a b s t r a c tA series of differently loaded palladium-iron catalysts was prepared by a controlled co-precipitation method of the nitrate precursors, in order to ensure homogeneous Pd particle size-distribution. After characterization of the pre-catalysts by various techniques, different controlled reduction conditions were applied to investigate the interactions within the Pd-iron system, containing reversible and irreversible processes like phase transformations, SMSI, sintering and alloying. Strong indications for the reversible surface decoration of the Pd nanoparticles with iron oxide species via strong metal-support interaction were found by the combined results of DRIFTS, CO-chemisorption, TEM and XPS measurements. This SMSI state was found to be unstable. It was observed independent of bulk phase or palladium particle size. Catalytic CO-oxidation was found to be a suitable test reaction for the study of the phenomenon: higher activity as well as oxidative deactivation of the SMSI state was observed by investigating the lightoff behavior in repeated, temperature-programmed cycles as well as by isothermal measurements. The instability was found to be higher in case of higher Pd dispersion. In addition, bulk properties of the Pd-Fe system, like alloying, were investigated by detailed XRD measurements.

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Section: Drifts Surface Investigationmentioning

confidence: 65%

“…5). Besides some gas phase CO present in this measurement design and physisorbed CO on palladium (at around 2150 cm −1 ) [25], the adsorption of CO on Pd 2+ is very likely to contribute to the spectrum [29][30][31][32]. Nevertheless, CO on metallic Pd (1979, 1945 cm −1 ) is present as well.…”

Section: Drifts Surface Investigationmentioning

confidence: 99%

CO oxidation as a test reaction for strong metal–support interaction in nanostructured Pd/FeO powder catalysts

Kast

Friedrich

Teschner

et al. 2015

Applied Catalysis A: General

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show abstract

“…The bands at 1650, 1533 and 1410 cm −1 can be assigned to nitrate and nitrite species, monodentate nitrate species and nitro species, respectively [41][42][43][44][45][46][47][48]. The band at 1871 cm −1 can be attributed to the Ru-ON species [49]. Figures 9c and 9d show the DRIFTS of adsorbed N2O over Ru/Al2O3-H2 and Ru/Al2O3-air.…”

Section: Drifts Studiesmentioning

confidence: 96%

Effect of Ru Species on N2O Decomposition over Ru/Al2O3 Catalysts

et al. 2016

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Abstract:Ru is considered as an effective active species for N 2 O decomposition; however, there is disagreement about which ruthenium species is key for catalytic activity. In order to understand the role of Ru species in N 2 O decomposition, Ru/Al 2 O 3 (Ru/Al 2 O 3 -H 2 , Ru/Al 2 O 3 -NaBH 4 , Ru/Al 2 O 3 -air) catalysts with different ratios of metallic Ru were prepared and evaluated for their catalytic activities. Various characterizations, especially in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), were applied to investigate the relationship between activity and different Ru species. The results indicate that the N 2 O conversion displayed a linear relationship with the amount of metallic Ru. The DRIFTS results of adsorption for N 2 O show that metallic Ru was the active site. The catalytic processes are put forward based on metallic Ru species. The deactivation with increasing times used is due to the decrease in the amount of metallic Ru and agglomerates of Ru particles on the surface of catalysts.

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“…11d (cis) and the hyponitrite ion N 2 O 2 2− (trans), respectively [47]. In addition, the peaks at 1941 and 2002 cm −1 assigned to the (NOx − )-Ti 4+ -NO, the peak at 1809 cm −1 assigned to the Pt 2+ -NO, and the peak at 1775 cm −1 assigned to the Pt 0 -NO [48] can be also observed in the region of 1750-2350 cm −1 (curve C in Fig. 11d To further describe the behavior of UV light on the reaction of NO + CO over Pt/TiO 2 and Pt/CeO 2 -TiO 2 , the in-situ FT-IR spectra of two samples co-adsorbing NO and CO were recorded.…”

Section: Catalytic Performancesmentioning

confidence: 99%

“…11a), the increased peak at 1645 cm −1 and the decreased peaks at 1443 and 1413 cm −1 mean that UV light can promote the carboxylate-like species at TiO 2 sites to react with the surface hydroxyls over Pt/TiO 2 (resulting in the formation of H 2 O[35]). For Pt/CeO 2 -TiO 2 adsorbing CO in dark (curve C inFig.11), two observed broad peaks at 1500 and 1414 cm −1 can be assigned to the carboxylate-like species at CeO 2 or TiO 2 sites[37]. Moreover, the two peak areas greatly increase with the introduction of UV light (curve D inFig.…”

mentioning

confidence: 98%

Promotion effect of ultraviolet light on NO + CO reaction over Pt/TiO2 and Pt/CeO2–TiO2 catalysts

Huang

Lin

Yang

et al. 2015

Applied Catalysis B: Environmental

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DRIFTS studies on CO and NO adsorption and NO+CO reaction over Pd2+-substituted CeO2 and Ce0.75Sn0.25O2 catalysts

Cited by 68 publications

References 55 publications

CO oxidation as a test reaction for strong metal–support interaction in nanostructured Pd/FeO powder catalysts

CO oxidation as a test reaction for strong metal–support interaction in nanostructured Pd/FeO powder catalysts

Effect of Ru Species on N2O Decomposition over Ru/Al2O3 Catalysts

Promotion effect of ultraviolet light on NO + CO reaction over Pt/TiO2 and Pt/CeO2–TiO2 catalysts

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