Characterization and reductive amination of cyclohexanol and cyclohexanone over Cu/ZrO2 catalysts

Chary, Komandur V. R.; Seela, Kottapalli Kalyana; Naresh, Dhachapally; Pagadala, Ramakanth

doi:10.1016/j.catcom.2007.05.016

Cited by 80 publications

(47 citation statements)

References 39 publications

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“…7b). 2D and 3D clusters [52][53][54][55][56], while the peak at 227°C is associated with the reduction of more aggregated copper oxide species. An increase in calcination temperature to 900°C resulted in a shift of these peaks to higher temperatures (260-380°C).…”

Section: Resultsmentioning

confidence: 99%

“…7d). The shift of this peak to higher temperatures is a result of the thermally induced transformation of small copper oxide species into larger bulky clusters, which exhibit lower reducibility [52][53][54][55][56] 2 ) are possible side products of the ammonia oxidation process. Activity tests were performed for the catalyst samples calcined at 600 or 900°C as well as without catalyst for comparison.…”

Section: Resultsmentioning

confidence: 99%

“…An increase in calcination temperature to 900°C resulted in a shift of these peaks to higher temperatures (260-380°C). This effect could be explained by the formation of bulky copper oxide species at elevated calcination temperature, which are characterised by lower reducibility [52][53][54][55][56] [55,57]:…”

Section: Resultsmentioning

confidence: 99%

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Thermal transformations of Cu–Mg (Zn)–Al(Fe) hydrotalcite-like materials into metal oxide systems and their catalytic activity in selective oxidation of ammonia to dinitrogen

Jabłońska

Chmielarz

Węgrzyn

et al. 2013

J Therm Anal Calorim

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and Fe 3? in the Me III positions were synthesized by coprecipitation method. Detailed studies of thermal transformation of obtained LDHs into metal oxide systems were performed using high temperature X-ray diffraction in oxidising and reducing atmosphere, thermogravimetry coupled with mass spectrometry and temperature-programmed reduction. The LDH samples calcined at 600 and 900°C were tested in the role of catalysts for selective oxidation of ammonia into nitrogen and water vapour. It was shown that all copper congaing samples presented high catalytic activity and additionally, for the Cu-Mg-Al and Cu-Mg-Fe hydrotalcite samples calcined at 600°C relatively high stability and selectivity to dinitrogen was obtained. An increase in calcination temperature to 900°C resulted in a decrease of their catalytic activity, possibly due to formation of well-crystallised metal oxide phases which are less catalytically active in the process of selective oxidation of ammonia.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Thermal transformations of Cu–Mg (Zn)–Al(Fe) hydrotalcite-like materials into metal oxide systems and their catalytic activity in selective oxidation of ammonia to dinitrogen

Jabłońska

Chmielarz

Węgrzyn

et al. 2013

J Therm Anal Calorim

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“…2 as a and b) were found for the copper containing samples. The a peak is related to the reduction of highly dispersed copper oxide species, which include isolated copper ions and small two-and threedimensional clusters [25][26][27][28]. The b peak is associated with reduction of bulk-like CuO phases that include large clusters and bulk CuO.…”

Section: Resultsmentioning

confidence: 99%

Selective Catalytic Oxidation (SCO) of Ammonia to Nitrogen over Hydrotalcite Originated Mg–Cu–Fe Mixed Metal Oxides

et al. 2011

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Mg-Cu-Fe oxide systems, obtained from hydrotalcite-like precursors, were tested as catalysts for the selective catalytic oxidation (SCO) of ammonia. Copper containing catalysts were active in low-temperature SCO processes; however, their selectivity to nitrogen significantly decreased at higher temperatures. The optimum composition of the catalyst to guarantee high activity and selectivity to N 2 was proposed. Temperature-programmed experiments, SCO catalytic tests performed with various contact times and additional tests on the samples in the selective catalytic reduction of NO with ammonia showed that the SCO process over the studied calcined hydrotalcites proceeds according to the internal SCR mechanism and oxidation of ammonia to NO is a rate-determining step in the low-temperature range.

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“…26,27 In this work, Figure 3. XPS spectra of (a) the fresh Pd/Al2O3, (b) the deactivated Pd/Al2O3, (c) the fresh Pd/Al2O3-BaO, (d) the used Pd/Al2O3-BaO, (e) Ba3d XPS spectra of Pd/Al2O3-BaO and (f) N1s XPS spectra of the deactivated Pd/Al2O3.…”

Section: Resultsmentioning

confidence: 68%

Highly Selective Amination of o- and p-Alkyl Phenols over Pd/Al₂O₃-BaO

Ma¹,

Wang²,

Sun³

et al. 2012

Bulletin of the Korean Chemical Society

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A series of Pd-based catalysts were prepared and examined for the amination of 2,6-dimethylphenol in a fixedbed reactor. The best results were obtained for Pd/Al2O3-BaO with a conversion of 99.89% and a selectivity of 91.16%. These catalysts were characterized using BET, XRD, XPS, TEM and NH3-TPD. Doped BaO not only improved the dispersion of the Pd particles but also decreased the acidity of the catalyst, which remarkably enhanced the selectivity and stability of the catalyst. The generality of Pd/Al2O3-BaO for this kind of reaction was demonstrated by catalytic aminations of o-and p-alkyl phenols.

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Characterization and reductive amination of cyclohexanol and cyclohexanone over Cu/ZrO2 catalysts

Cited by 80 publications

References 39 publications

Thermal transformations of Cu–Mg (Zn)–Al(Fe) hydrotalcite-like materials into metal oxide systems and their catalytic activity in selective oxidation of ammonia to dinitrogen

Thermal transformations of Cu–Mg (Zn)–Al(Fe) hydrotalcite-like materials into metal oxide systems and their catalytic activity in selective oxidation of ammonia to dinitrogen

Selective Catalytic Oxidation (SCO) of Ammonia to Nitrogen over Hydrotalcite Originated Mg–Cu–Fe Mixed Metal Oxides

Highly Selective Amination of o- and p-Alkyl Phenols over Pd/Al₂O₃-BaO

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Characterization and reductive amination of cyclohexanol and cyclohexanone over Cu/ZrO2 catalysts

Cited by 80 publications

References 39 publications

Thermal transformations of Cu–Mg (Zn)–Al(Fe) hydrotalcite-like materials into metal oxide systems and their catalytic activity in selective oxidation of ammonia to dinitrogen

Thermal transformations of Cu–Mg (Zn)–Al(Fe) hydrotalcite-like materials into metal oxide systems and their catalytic activity in selective oxidation of ammonia to dinitrogen

Selective Catalytic Oxidation (SCO) of Ammonia to Nitrogen over Hydrotalcite Originated Mg–Cu–Fe Mixed Metal Oxides

Highly Selective Amination of o- and p-Alkyl Phenols over Pd/Al2O3-BaO

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Highly Selective Amination of o- and p-Alkyl Phenols over Pd/Al₂O₃-BaO