Reactions of Metal Salts and Alkali Metal Nitrates. Role of the Metal Precursors and Alkali Metal Ions in the Resulting Phase of Zirconia

Marote, Pedro; Durand, Bernard; Deloume, J.P.

doi:10.1006/jssc.2001.9393

Cited by 7 publications

(5 citation statements)

References 14 publications

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“…Copper addition to the hydrated zirconia led to stabilization of the metastable tetragonal crystalline phase. This stabilization was observed by other authors , when they added di- or trivalent cations to zirconium oxide. The crystalline phase of the copper oxide (2-theta = 38.5, 35.3, 48.6, 61.4, 67.9) was only observed in the Cu(10)ZrO 2 catalyst.…”

Section: Resultssupporting

confidence: 76%

“…Figure 3 shows a reduction diagram of Cu(5)ZrO 2 catalyst with reduction signals between 170 and 300 °C, characteristic of CuO. 23,26,27 All copper catalysts, Cu(n)ZrO 2 , present a similar reduction profile, and there exists a lineal correlation between the H 2 consumption and the copper content in Cu(n)ZrO 2 catalysts.…”

Section: Characterization Of Catalysts 311 X-ray Diffraction Xrdmentioning

confidence: 99%

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Zirconia-Supported Cu-KNO₃ Catalyst: Characterization and Catalytic Behavior in the Catalytic Combustion of Soot with a NO/O₂ Mixture

Lick

Carrascull

Ponzi

et al. 2008

Ind. Eng. Chem. Res.

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The catalytic combustion of diesel soot was studied in the presence of catalysts: CuZrO 2 , KNO 3 ZrO 2 , and CuKNO 3 ZrO 2 . The catalysts were prepared by impregnation of ZrO 2 • nH 2 O into an aqueous solution of Cu(NO 3 ) 2 , KNO 3 , or both salts simultaneously. The catalysts were characterized by X-ray diffraction (XRD), differential scanning calorimetry (DSC), and temperature-programmed reduction (TPR). Cu(n)KNO 3 ZrO 2 catalysts present high activity, and the value of the combustion temperature decreases 200 °C with respect to the temperature of the process without catalyzing, with T max values between 370 and 380 °C. The activity is associated with KNO 3 presence, and the role of KNO 3 can be attributed to (i) an increase of contact between soot and the surface of the catalyst and (ii) a redox reaction in which the nitrate is reduced to nitrite by reaction with carbon and again reoxidized to nitrate. The copper contribution is associated with the reaction selectivity toward CO 2 formation.

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Section: Resultssupporting

confidence: 76%

Section: Characterization Of Catalysts 311 X-ray Diffraction Xrdmentioning

confidence: 99%

Zirconia-Supported Cu-KNO₃ Catalyst: Characterization and Catalytic Behavior in the Catalytic Combustion of Soot with a NO/O₂ Mixture

Lick

Carrascull

Ponzi

et al. 2008

Ind. Eng. Chem. Res.

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“…The presence of alkaline ions, in this case lithium, promotes the formation of the metastable tetragonal crystalline phase as it has been reported in previous works. 6,7 This interaction metalÀsupport can be originated with the lithium incorporation to the network and the consequent generation of oxygen vacancies. On the other hand, the AuZt catalyst preferably presents monoclinic structure.…”

Section: Resultsmentioning

confidence: 99%

NO Influence on Catalytic Soot Combustion: Lithium Nitrate and Gold Catalysts

Ruiz

Lick

Aparicio

et al. 2012

Ind. Eng. Chem. Res.

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The diesel soot combustion was studied using catalysts prepared by impregnation with lithium nitrate and/or gold on zirconium oxide (ZrO 2 ), hydrated zirconium oxide, and silica (SiO 2 ). Catalysts were characterized by elemental analysis, atomic absorption spectrophotometry, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). Measurements of catalytic activity were performed in a fixed bed reactor with a NO/O 2 feed. The NO reacts with the Li 2 O generating "in situ" lithium nitrate that participates in the oxidation of diesel soot and accelerates the reaction rate. All catalysts containing lithium nitrate exhibit a good activity for soot oxidation, and the gold addition substantially increases selectivity to CO 2 .

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“…Murata 8 9 . A reconstructive decomposition follows on heating the polymer gel (dried and pulverised into a powder) in air, forming a refined Li+: t-ZrO 2 powder at temperatures as low as 500-600 °C.…”

Section: Introductionmentioning

confidence: 99%

“…At atmospheric pressure, pure ZrO 2 exists in three well known polymorphs of P2 1/c monoclinic (m), P4 2/nmc tetragonal (t), and F m3m cubic fluorite (c) crystal structures, where m-ZrO 2 is the equilibrium bulk structure at low temperatures. 9 . A reconstructive decomposition follows on heating the polymer gel (dried and pulverised into a powder) in air, forming a refined Li+: t-ZrO 2 powder at temperatures as low as 500-600 °C.…”

mentioning

confidence: 99%

Synthesis of Lithium-doped Zirconia Nanoceramics of Controlled Oxygen Vacancies

Mohapatra

Ram

2007

DSJ

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Doping of lithium (Li . INTRODUCTIONInterest in nanocrystalline zirconia (ZrO 2 ) ceramics, of average diameter in the 2-100 nm range, has increased during recent years, because of their properties (e.g., sintering ability, mechanical toughness, superplastic behaviour) are significantly different from those in a coarse grained structure [1][2][3][4] . At atmospheric pressure, pure ZrO 2 exists in three well known polymorphs of P2 1/c monoclinic (m), P4 2/nmc tetragonal (t), and F m3m cubic fluorite (c) crystal structures, where m-ZrO 2 is the equilibrium bulk structure at low temperatures. 9 . A reconstructive decomposition follows on heating the polymer gel (dried and pulverised into a powder) in air, forming a refined Li+: t-ZrO 2 powder at temperatures as low as 500-600 °C.

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Reactions of Metal Salts and Alkali Metal Nitrates. Role of the Metal Precursors and Alkali Metal Ions in the Resulting Phase of Zirconia

Cited by 7 publications

References 14 publications

Zirconia-Supported Cu-KNO₃ Catalyst: Characterization and Catalytic Behavior in the Catalytic Combustion of Soot with a NO/O₂ Mixture

Zirconia-Supported Cu-KNO₃ Catalyst: Characterization and Catalytic Behavior in the Catalytic Combustion of Soot with a NO/O₂ Mixture

NO Influence on Catalytic Soot Combustion: Lithium Nitrate and Gold Catalysts

Synthesis of Lithium-doped Zirconia Nanoceramics of Controlled Oxygen Vacancies

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Reactions of Metal Salts and Alkali Metal Nitrates. Role of the Metal Precursors and Alkali Metal Ions in the Resulting Phase of Zirconia

Cited by 7 publications

References 14 publications

Zirconia-Supported Cu-KNO3 Catalyst: Characterization and Catalytic Behavior in the Catalytic Combustion of Soot with a NO/O2 Mixture

Zirconia-Supported Cu-KNO3 Catalyst: Characterization and Catalytic Behavior in the Catalytic Combustion of Soot with a NO/O2 Mixture

NO Influence on Catalytic Soot Combustion: Lithium Nitrate and Gold Catalysts

Synthesis of Lithium-doped Zirconia Nanoceramics of Controlled Oxygen Vacancies

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Product

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About

Zirconia-Supported Cu-KNO₃ Catalyst: Characterization and Catalytic Behavior in the Catalytic Combustion of Soot with a NO/O₂ Mixture

Zirconia-Supported Cu-KNO₃ Catalyst: Characterization and Catalytic Behavior in the Catalytic Combustion of Soot with a NO/O₂ Mixture