Reaction intermediates in the selective reduction of NO with propene over Ga2O3-Al2O3 and In2O3-Al2O3 catalysts

Haneda, Masaaki; Joubert, Emmanuel; Menezo, J. C.; Duprez, Daniel; Barbier, J.; Bion, Nicolas; Daturi, Marco; Saussey, J.; Lavalley, Jean‐Claude; Hamada, Hideaki

doi:10.1016/s1381-1169(01)00215-1

Cited by 37 publications

(20 citation statements)

References 40 publications

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“…at 1350 cm −1 are typical of δ(CH) and ν s ((CO 2 − ) modes, respectively, of formate species [26][27][28][29][30]49,50]. The ν as (CO 2 − ) stretching vibration usually falls in the 1600-1550 cm −1 region and probably is covered by the band at 1580 cm −1 (Fig.…”

Section: Interaction Of the Nomentioning

confidence: 89%

“…Here again, the absorption at 1718 cm −1 is typical of a carboxylic acid coordinated to surface hydroxyl groups, whereas, the band at 1667 cm −1 is assigned to a carboxylic acid coordinately bonded through the carbonyl oxygen to a Lewis acid site. The band at 1424 cm −1 is characteristic of acetate moiety and corresponds to the ν s (CO 2 − ) mode [26][27][28][29][30]. These facts show that the nitrate species oxidize the adsorbed decane, which results in formation of acetic acid and CO.…”

Section: Catalyst Cuzsmentioning

confidence: 91%

“…The latter is partially masked by the negative absorption at 1385 cm −1 due to sulfate groups perturbed by the water molecules produced (absorption at approximately 1640 cm −1 ). The bands at 1578 and 1420 cm −1 are typical of acetate species [26][27][28][29][30]. However, formation of HCOO − ions, which usually display their ν as (CO 2 − ) modes between 1600 and 1550 cm −1 [26][27][28][29][30]49,50], cannot be excluded.…”

Section: Interaction Of the Adsorbed Decane With The Surfaces Of Cuz mentioning

confidence: 99%

“…The results of TPD of adsorbed NO x species [22,23] and the IR data on the mechanism of SCR of NO by hydrocarbons on various oxide catalysts [24][25][26][27][28][29][30][31] reveal a reaction scheme that involves interaction of strongly adsorbed NO x − species (x is 2 or 3) with the hydrocarbon. However, only a few studies using in situ FT-IR spectroscopy have appeared on the identification of surface NO x species produced during the adsorption of NO on copper(II)-zirconia catalysts, whereas, many reports have been published dealing, for example, with copper-supported on zeolites and alumina [31].…”

Section: Introductionmentioning

confidence: 96%

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FT-IR spectroscopic investigation of the reactivity of NOx species adsorbed on Cu2+/ZrO2 and CuSO4/ZrO2 catalysts toward decane

Kantcheva

2003

Applied Catalysis B: Environmental

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The nature of the NO x species produced on NO adsorption and its co-adsorption with O 2 at room temperature on zirconia-supported copper(II) catalysts has been studied by means of in situ FT-IR spectroscopy. The samples were prepared by impregnation of zirconia with aqueous solutions of copper(II) nitrate and sulfate. The structural identification of the surface NO x complexes exhibiting absorptions in the fundamental nitro-nitrato region was performed by analyzing the combination bands of the nitrate species. In order to understand which factors control the selectivity of the catalysts in the catalytic reduction of NO by longer chain hydrocarbons, the stability of surface nitro-nitrato species and their reactivity toward adsorbed decane at various temperatures was investigated. The nitrates on the CuSO 4 /ZrO 2 catalyst are characterized by significantly lower thermal stability than the nitro-nitrato species on the Cu 2+ /ZrO 2 sample. The difference in the thermal stability of the NO x − species (x is 2 and 3) parallels their reactivity toward the adsorbed decane. The sulfate-free catalyst contains bidentate nitro species that are inert toward the hydrocarbon. The bidentate nitro species start to decompose to NO at temperatures higher than 523 K. In contrast, the nitrate species formed on the CuSO 4 /ZrO 2 catalyst are able to oxidize the adsorbed decane completely at 523 K producing acetates, formates, adsorbed CO and isocyanate species. It is proposed that the presence of stable nitro species on the sulfate-free copper(II)-zirconia catalyst is associated with its non-selective behavior above 573 K in the reduction of NO with decane in an excess of oxygen reported in the literature.

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Section: Interaction Of the Nomentioning

confidence: 89%

Section: Catalyst Cuzsmentioning

confidence: 91%

Section: Interaction Of the Adsorbed Decane With The Surfaces Of Cuz mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

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FT-IR spectroscopic investigation of the reactivity of NOx species adsorbed on Cu2+/ZrO2 and CuSO4/ZrO2 catalysts toward decane

Kantcheva

2003

Applied Catalysis B: Environmental

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“…The more important applications include dehydrogenation and aromatization of light hydrocarbons [1,2], methanol synthesis [3], the selective removal of nitrogen oxides [4,5], and cracking and hydrocracking of cumene [6]. Nakagawa et al [1] found that Ga 2 O 3 was an effective catalyst for the dehydrogenation of ethane to ethene in the presence of carbon dioxide at 650°C.…”

Section: Introductionmentioning

confidence: 99%

Ethylene Hydrogenation over Pt/Ga2O3/Al2O3 Catalysts

et al. 2008

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The effects of gallia addition on the Pt dispersion and the activity for ethylene hydrogenation at 0°C were studied for Pt-supported catalysts as a function of the reduction temperature (350, 450, and 550°C). The catalysts contained 0.5 wt.% Pt and were prepared by successive incipient wetness impregnations with Ga(NO 3 ) 3 and H 2 PtCl 6 aqueous solutions. CO and H 2 chemisorption data indicated that, the addition of small amount of Ga 2 O 3 caused an increase of the Pt dispersion and a decrease of ethylene conversion. Both of them decreased appreciably when Ga 2 O 3 addition was increased, particularly, for the case where bGa 2 O 3 was used as a support. The increase in reduction temperature magnified the negative effects of the gallia addition on dispersion and activity, although the addition of small amount of gallia improved the resistance to metal sintering. Results were interpreted in terms of the presence of reduced Ga species, which can encapsulate Pt particles.

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