Ethylbenzene dehydrogenation over binary FeOx–MeOy/Mg(Al)O catalysts derived from hydrotalcites

Jermy, B. Rabindran; Khurshid, Alam; Al-Ali, A. R.; Atanda, Luqman; Sagata, Kunimasa; Asamoto, Makiko; Yahiro, Hidenori; Nomura, Kiyoshi; Sano, Tsuneji; Takehira, Katsuomi

doi:10.1016/j.apcata.2010.10.017

Cited by 38 publications

(26 citation statements)

References 48 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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“…For example, Cu-Mg-Al mixed oxides were found to be active and selective catalysts for the DeNOx process [3] and selective catalytic oxidation of ammonia to nitrogen and water vapor [7]. Hydrotalcite-based mixed metal oxides modified with nickel were effective catalysts of steam methane reforming [8], while iron containing hydrotalcites were recognized as precursors of effective catalysts for ethylbenzene dehydrogenation [9].…”

Section: Introductionmentioning

confidence: 99%

An influence of thermal treatment conditions of hydrotalcite-like materials on their catalytic activity in the process of N2O decomposition

Chmielarz

Rutkowska

Kuśtrowski

et al. 2011

J Therm Anal Calorim

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Hydrotalcite-like materials containing apart from magnesium and aluminum also copper, cobalt, nickel, and iron were prepared by a co-precipitation method. Thermal transformations of hydrotalcite-like materials were studied by thermal analysis methods as well as XRD, UV-vis-DRS, and XPS measurements of the samples calcined at various temperatures (600, 700, and 800°C). Calcined hydrotalcites, especially those containing cobalt and copper, were found to be active and selective catalysts of N 2 O decomposition. It was shown that an increase in the calcination temperature significantly activated the Co-containing catalysts. Promotion of the samples with potassium resulted in activation of the hydrotalcite-based catalysts.

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Ethylbenzene dehydrogenation over binary FeOx–MeOy/Mg(Al)O catalysts derived from hydrotalcites

Cited by 38 publications

References 48 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

An influence of thermal treatment conditions of hydrotalcite-like materials on their catalytic activity in the process of N2O decomposition

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