Influence of supports on the activities of copper oxide species in the low-temperature NO+CO reaction

Hu, Yingfei; Dong, Lin; Shen, Mouquan; Dong, Lixin; Wang, Jun; Ding, Weiping; Chen, Yi

doi:10.1016/s0926-3373(00)00269-1

Cited by 112 publications

(56 citation statements)

References 29 publications

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“…The authors claimed that incorporation of Cu 2+ in the lattice position of Zr 4+ ions could be the main reason for this. Hu et al [55] also observed that addition of CuO delayed the phase transformation of ZrO 2 from tetragonal to monoclinic at 700˝C. These authors observed a decrease in lattice parameter of ZrO 2 with an increase of CuO content to 30 mol%.…”

Section: Resultsmentioning

confidence: 92%

“…It is most probable that the Cu ions are bonded to the oxygen anions on the surface of ZrO 2 forming Zr-O-Cu groups. It was also reported that the formation of the Cu-O-Zr bonds in CuAlZr containing catalysts brings a synergistic interaction between Cu and Zr and this facilitates the reduction of Cu 2+ species [55]. An enhanced reducibility of Cu 2+ in both of the.…”

Section: Resultsmentioning

confidence: 94%

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Physico-Chemical and Catalytic Properties of Mesoporous CuO-ZrO2 Catalysts

et al. 2016

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Mesoporous CuO-ZrO 2 catalysts were prepared and calcined at 500˝C. The performance of the synthesized catalysts for benzylation of benzene using benzyl chloride was studied. The bare support (macroporous ZrO 2 ) offered 45% benzyl chloride conversion after reaction time of 10 h at 75˝C. Significant increase in benzyl chloride conversion (98%) was observed after CuO loading (10 wt. %) on porous ZrO 2 support. The conversion was decreased to 80% with increase of CuO loading to 20 wt. %. Different characterization techniques (XRD, Raman, diffuse reflectance UV-vis, N 2 -physisorption, H 2 -TPR, XPS and acidity measurements) were used to evaluate physico-chemical properties of CuO-ZrO 2 catalysts; the results showed that the surface and structural characteristics of the ZrO 2 phase as well as the interaction between CuO-ZrO 2 species depend strongly on the CuO content. The results also indicated that ZrO 2 support was comprised of monoclinic and tetragonal phases with macropores. An increase of the volume of monoclinic ZrO 2 phase was observed after impregnation of 10 wt. % of CuO; however, stabilization of tetragonal ZrO 2 phase was noticed after loading of 20 wt. % CuO. The presence of low-angle XRD peaks indicates that mesoscopic order is preserved in the calcined CuO-ZrO 2 catalysts. XRD reflections due to CuO phase were not observed in case of 10 wt. % CuO supported ZrO 2 sample; in contrast, the presence of crystalline CuO phase was observed in 20 wt. % CuO supported ZrO 2 sample. The mesoporous 10 wt. % CuO supported ZrO 2 catalyst showed stable catalytic activity for several reaction cycles. The observed high catalytic activity of this catalyst could be attributed to the presence of a higher number of dispersed interactive CuO (Cu 2+ -O-Zr 4+ ) species, easy reducibility, and greater degree of accessible surface Lewis acid sites.

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Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 94%

Physico-Chemical and Catalytic Properties of Mesoporous CuO-ZrO2 Catalysts

et al. 2016

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“…In the literature [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24], copper oxide supported on different oxides (e.g., SiO 2 , TiO 2 , Al 2 O 3 , CeO 2 ) has been tested in the reaction of NO + CO. Among these supports, CeO 2 has received special attention due to the role of the oxygen buffering center through the facile Ce 4+ /Ce 3+ redox cycle [1,25].…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, the weak sintering resistance ability of CeO 2 can be compensated by the incorporation of Zr; in addition, CeO 2 redox capacity also can be enhanced. Dong and his group have reported the use of copper-based catalysts for the reaction of NO + CO [12,13,[15][16][17][18][19][20][21][22][23][24]. They suggested that the excellent performance of NO reduction and CO oxidation was attributed to the strong interaction between copper and the unique redox behavior of CeO 2 .…”

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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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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“…A adição da céria pode estar provocando uma maior dispersão da titânia e com isso, um aumento na área superficial. HU et al, 2001e ZIMMER et al, 2002. A adição da fase ativa CuO não diminuiu a intensidade dos picos referentes aos suportes.…”

Section: áRea Superficial Específica (Método Bet)unclassified

Utilização de catalisadores de cobre e cobalto suportados em CeO2, TiO2 e matrizes de CeO2-TiO2, para redução de NO com CO na ausência ou presença de O2

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Influence of supports on the activities of copper oxide species in the low-temperature NO+CO reaction

Cited by 112 publications

References 29 publications

Physico-Chemical and Catalytic Properties of Mesoporous CuO-ZrO2 Catalysts

Physico-Chemical and Catalytic Properties of Mesoporous CuO-ZrO2 Catalysts

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

Utilização de catalisadores de cobre e cobalto suportados em CeO2, TiO2 e matrizes de CeO2-TiO2, para redução de NO com CO na ausência ou presença de O2

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