Yttria-Stabilized Zirconia Supported Copper Oxide Catalyst

Dow, Wei‐Ping; Wang, Yu-Piao; Huang, Ta-Jen

doi:10.1006/jcat.1996.0135

Cited by 330 publications

(112 citation statements)

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“…The low temperature peaks of TPR due to highly dispersed CuO and/or Cu(II) species have also been observed for supported CuO. 44,45 Van der Grift et al 46 and Robertson et al 47 further supported this observation concluding that the highly dispersed copper oxide species are more easily reduced than bulk CuO. CAPS-CuO seemed to have no bulk copper oxide and was therefore reduced at very low temperatures, while com-CuO comprises both dispersed and bulk-like CuO resulting in a shift in reduction peak to higher temperatures without exhibiting true bulk behavior.…”

Section: Characterization Of Caps- Mes-and Com-cuomentioning

confidence: 78%

Copper oxide as efficient catalyst for oxidative dehydrogenation of alcohols with air

Poreddy

Engelbrekt

Riisager

2015

Catal. Sci. Technol.

136

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Section: Characterization Of Caps- Mes-and Com-cuomentioning

confidence: 78%

Copper oxide as efficient catalyst for oxidative dehydrogenation of alcohols with air

Poreddy

Engelbrekt

Riisager

2015

Catal. Sci. Technol.

136

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“…It is known that nanosize particles have properties different than bulk oxides, and this mixed oxidation state could be the result of the defective structure of the small clusters. It is also possible that oxygen vacancies in Zr(Y)O 2 stabilize the Cu species as was postulated by Dow and Huang [28] and Dow et al [29]. Surface composition analysis shows that copper is mostly at the catalyst surface.…”

Section: Catalyst Characterizationmentioning

confidence: 80%

“…Bulk CuO has been reported to reduce at 200± 3008C [27]. Support effects on the dispersion and reducibility of copper oxide have been documented in the literature [28,29].…”

Section: Introductionmentioning

confidence: 93%

Reduction characteristics of copper oxide in cerium and zirconium oxide systems

Kundakovic

Flytzani‐Stephanopoulos

1998

Applied Catalysis A: General

386

173

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The reduction of CuO dispersed on¯uorite-type oxide catalysts, namely La-doped CeO 2 and Y-doped ZrO 2 was studied in this work. On both supports distinct copper species were identi®ed as a function of copper content by temperatureprogrammed reduction (TPR) by H 2 and CH 4 , X-ray photoelectron spectroscopy (XPS), X-ray powder diffraction (XRD) and scanning transmission electron microscopy/energy dispersive X-ray (STEM/EDX) analyses. At low copper loading (<15 at%), the copper phase is present as small clusters, which are reduced at lower temperature than bulk CuO. At higher Cu loading (>15 at%), in addition to clusters, larger CuO particles are present which are reduced at higher temperature close to the reduction temperature of bulk CuO. At copper loading lower than ca. 5 at%, copper is present as highly dispersed clusters or isolated Cu ions, which interact strongly with the¯uorite-type oxide, thus requiring higher reduction temperature. However, the latter is still below the bulk CuO reduction temperature. Copper is more stabilized when dispersed in Ce(La)O 2 than in Zr(Y)O 2 matrix, so that reduction of copper oxide species requires lower temperatures on the Zr(Y)O 2 -based catalysts. The reducibility of the doped ceria is enhanced by the presence of copper in both H 2 -and CH 4 -TPR. On the other hand no such interaction is present in CuZr(Y)O 2 system. The activity of various copper species for methane oxidation is discussed. # 1998 Elsevier Science B.V. All rights reserved.

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“…In the fresh Cu-ZSM-5 and Cu-IM-5, the Cu is reduced in two stages giving The reason why the first reduction is seen as only one peak and not as two, as would be expected 570 when Cu-dimers are present, is because the limiting step is the dissociation of H 2 and not the 571 reduction itself in the first step [55]. show reduction in this temperature range [56,57]. well [59].…”

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confidence: 99%