The behavior of Cu/ZSM-5 in the oxide and reduced form in the presence of NO and methanol

Carvalho, Marta Cristina Nunes Amorim de; Passos, Fábio B.; Schmal, Martín

doi:10.1016/s0926-860x(99)00444-5

Cited by 86 publications

(37 citation statements)

References 38 publications

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“…Generally, bands were observed in the ranges of 300 -350 nm and 700 -900 nm and were attributed to the Cu 2ϩ -O 2Ϫ electronic transition species and the d-d transitions of Cu 2ϩ in an octahedral environment with O h symmetry, respectively. The formation of Cu species is in agreement with Carvalho et al, 26 who described the reductive effect of NH 3 on Cu-La-Ce ternary metal catalysts. As in the XRD spectra, the 6:1:3 Cu-La-Ce ternary catalyst in the UV-Vis spectrum produced the strongest peaks of the tested catalysts.…”

Section: Resultssupporting

confidence: 90%

Production of Copper-Based Rare Earth Composite Metal Materials by Coprecipitation and Applications for Gaseous Ammonia Removal

Dong

2011

Journal of the Air & Waste Management Association

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This study addresses the oxidation of ammonia (NH 3 ) at temperatures between 423 and 673 K by selective catalytic oxidation (SCO) over a copper-based, rare earth composite metal material that was prepared by coprecipitating copper nitrate, lanthanum nitrate, and cerium nitrate at various molar ratios. The catalysts were characterized using Brunner, Emmett, and Teller spectroscopy, Fourier-transform infrared spectroscopy, Xray diffraction, ultraviolet-visible spectroscopy, cyclic voltammetric spectroscopy, and scanning electron microscopy. At a temperature of 673 K and an oxygen content of 4%, approximately 99.5% of the NH 3 was reduced by catalytic oxidation over the 6:1:3 copperlanthanum-cerium (molar ratio) catalyst. Nitrogen (N 2 ) was the main product of this NH 3 -SCO process. Results from the activity and selectivity tests revealed that the optimal catalyst for catalytic performance had the highest possible cerium content and specific surface area (43 m 2 /g).

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Section: Resultssupporting

confidence: 90%

Production of Copper-Based Rare Earth Composite Metal Materials by Coprecipitation and Applications for Gaseous Ammonia Removal

Dong

2011

Journal of the Air & Waste Management Association

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“…All of the samples exhibited strong absorption peaks at ca. 220 nm and 255 nm, which corresponded to the charge transfer transitions of isolated Cu(II) in coordination with lattice oxygen [31,32]. This result suggested the formation of SiAOACu in the framework of the samples [30,33,34].…”

Section: Characterization Of Catalystsmentioning

confidence: 76%

Enhanced Fenton-like degradation of pharmaceuticals over framework copper species in copper-doped mesoporous silica microspheres

Lyu

Zhang

2015

Chemical Engineering Journal

180

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“…2 B 2 transition and the first band observed in the near-infrared (Fig. 3c) species [42,43]. The effect of Zn on Cu is observed in the extreme UV spectrum of Cu-ZnO catalyst for CZ ratio variation from 1:9, 1:4, 1:3, 2:3 to 1:1.…”

Section: X-ray Diffraction and Edx Analysismentioning

confidence: 85%

Synthesis and spectroscopic characterisation of aurichalcite (Zn,Cu2+)5(CO3)2(OH)6; implications for Cu–ZnO catalyst precursors

Reddy

Frost

Locke

2007

Transition Met Chem

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The Cu-ZnO catalyst precursors with variable Cu:Zn ratio, between Zn-rich and Cu-rich compositions have been investigated by a combination of electronic and vibrational spectroscopy. Synthesized catalyst precursors exhibit two d-d transition bands of Cu 2+ ions in a distorted octahedral symmetry, at 7,600 and 12,900 cm -1 (1,315 and 775 nm). The effect of structural cation substitution (Zn 2+ and Cu 2+ ) on band shifts is observed in the spectra of the synthetic catalyst precursors. The observation of two broad features at *7,600 and 12,900 cm -1 (1,315 and 775 nm) is a strong indication for Zn 2+ substitution by Cu 2+ ions. The result of multiple bands in the symmetric stretching and bending regions confirms the reduction of symmetry from D 3h to C 2v /C s for (CO 3 ) 2-ion in aurichalcite. The synthetic aurichalcite may be used as a standard for identification of spectral properties of naturally occurring anhydrous carbonate minerals.

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The behavior of Cu/ZSM-5 in the oxide and reduced form in the presence of NO and methanol

Cited by 86 publications

References 38 publications

Production of Copper-Based Rare Earth Composite Metal Materials by Coprecipitation and Applications for Gaseous Ammonia Removal

Production of Copper-Based Rare Earth Composite Metal Materials by Coprecipitation and Applications for Gaseous Ammonia Removal

Enhanced Fenton-like degradation of pharmaceuticals over framework copper species in copper-doped mesoporous silica microspheres

Synthesis and spectroscopic characterisation of aurichalcite (Zn,Cu2+)5(CO3)2(OH)6; implications for Cu–ZnO catalyst precursors

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