Mesoporous MAl2O4 (M = Cu, Ni, Fe or Mg) spinels: Characterisation and application in the catalytic dehydrogenation of ethylbenzene in the presence of CO2

Batista, Andressa Hellen de Morais; Ramos, Francisca S. O.; Braga, Tiago Pinheiro; Luz-Lima, C.; Sousa, Francisco F. de; Barros, Eduardo B.; Filho, J. Mendes; Oliveira, Aldenor S. de; Sousa, Jackson R. de; Valentini, Antoninho; Oliveira, Alcinéia C.

doi:10.1016/j.apcata.2010.04.027

Cited by 76 publications

(21 citation statements)

References 41 publications

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“…3) O 4 , is excluded in the high temperature range due to redox properties of copper [42]. Formation of metallic copper, which is a possible product of CuO and CuAl 2 O 4 reduction was observed from temperature about 250°C and is represented by reflections at 44, 51 and 73°.…”

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%

“…The original HT-XRD diffractograms were attached as supplementary file. The analysis of the phase composition of the samples was based on the following reports [38][39][40][41][42][43][44][45].…”

Section: Resultsmentioning

confidence: 99%

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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“…Styrene and H 2 were simultaneously desorbed with the reoxidation of Fe 2+ to Fe 3+ . However, Mg 2+ -O 2− has low capacity for adsorption of CO 2 because of the strongly basic sites [12], which results in low rate of dehydrogenation. Fe 2+ -O 2− formed in the process of reduction has moderate basicity [12], which was more favorable for desorption of CO 2 .…”

Section: Discussion Of the Catalytic Activity Of Fe 2+mentioning

confidence: 99%

“…However, Mg 2+ -O 2− has low capacity for adsorption of CO 2 because of the strongly basic sites [12], which results in low rate of dehydrogenation. Fe 2+ -O 2− formed in the process of reduction has moderate basicity [12], which was more favorable for desorption of CO 2 . The base sites, e.g., oxygen species and O − species activate the gaseous CO 2 to form an O − entity, which abstracts the ␤-hydrogen [32].…”

Section: Discussion Of the Catalytic Activity Of Fe 2+mentioning

confidence: 99%

“…A lot of reports are available on EB dehydrogenation reaction in the presence of CO 2 over a variety of catalysts, such as iron oxide [3], vanadium oxide [4,5], TiO 2 -ZrO 2 mixed oxide [6,7], hydrotalcite-like oxide [8,9], spinel oxide [10][11][12][13], and Fecontaining ceramic composites [14]. Among these, spinel oxides containing iron species as catalysts for EB dehydrogenation have been screened extensively due to the benefits in preventing the deactivation process and increasing the activity of dehydrogenation of EB in the presence of CO 2 .…”

Section: Introductionmentioning

confidence: 99%

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Ethylbenzene dehydrogenation with CO2 over Fe-doped MgAl2O4 spinel catalysts: Synergy effect between Fe2+ and Fe3+

Zhang

Wang

et al. 2013

Journal of Molecular Catalysis A: Chemical

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The Synthetic Strategy for Developing Mesoporous Materials through Nanocasting Route

Kumar¹,

Chowdhury²

2015

Advanced Functional Materials

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Nanocasting is a powerful methodology for creating ordered mesoporous materials that are more diffi cult to synthesize by conventional processes. Synthesis starts with fabrication of inorganic/carbon precursors inside the nanospaces of a mesoporous hard template, which is used as a true mold to produce the mesoporous materials with controllable pore size, morphology of the network. Aft er fabrication inside the nanospaces, the template framework is selectively removed and the mesoporous ordered inorganic/organic material is obtained. In this chapter, a comprehensive literature survey for fabrication of mesoporous materials via mesoporous hard template, e.g., SBA-15, KIT-6, and mesoporous carbon, is presented. First two sections are limited to the basic understanding of nanocasting methodology. Th e later three sections comprise a review of works based on mesoporous silica/carbon template, which has been nurturing till date. A wide range of studies for synthesis of several inorganic compounds range from metal oxides, metal sulfi des, metal carbide phosphate, and ceramics is covered.

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Mesoporous MAl2O4 (M = Cu, Ni, Fe or Mg) spinels: Characterisation and application in the catalytic dehydrogenation of ethylbenzene in the presence of CO2

Cited by 76 publications

References 41 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

Ethylbenzene dehydrogenation with CO2 over Fe-doped MgAl2O4 spinel catalysts: Synergy effect between Fe2+ and Fe3+

The Synthetic Strategy for Developing Mesoporous Materials through Nanocasting Route

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