Mechanochemically synthesized nano-dimensional iron–cobalt spinel oxides as catalysts for methanol decomposition

Manova, Elina; Tsoncheva, Tanya; Paneva, Daniela; Mitov, Ivan; Tenchev, K.; Petrov, L.

doi:10.1016/j.apcata.2004.09.002

Cited by 98 publications

(51 citation statements)

References 42 publications

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“…However, no appreciable conversion has been reported at temperatures lower than 800˝C. Mixed catalyst showed a better stability due to oxidation of a small portion of deposited carbon by lattice oxygen in oxygen containing compounds like ceria and formation of filamentous carbon [12,13].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ce and Co Addition to Fe/Al2O3 for Catalytic Methane Decomposition

et al. 2016

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Abstract:Catalytic methane decomposition is studied in a fixed bed reactor. Two sets of bimetallic catalysts are employed, namely: 30%Fe-X%Ce/Al 2 O 3 and 30%Fe-X%Co/Al 2 O 3 , and compared with monometallic 30%Fe/Al 2 O 3 catalyst. The effect of promoting Fe with Ce and Co and reduction temperature are investigated. The results reveal that Ce addition has shown a negative impact on H 2 yield while a positive effect on H 2 yield and catalyst stability are observed with Co addition. In terms of number of moles of produced hydrogen per active sites, Fe/Al 2 O 3 has shown a higher number of moles of hydrogen compared to bimetallic catalysts. The catalyst reduced at 500˝C exhibits better activity as compared to the catalyst reduced at 950˝C. Carbon nano-tubes are deposited on the catalyst within the range of 14-73 nm diameter. Two types of carbon nanotubes are detected: Cα and Cγ.

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Section: Introductionmentioning

confidence: 99%

Effect of Ce and Co Addition to Fe/Al2O3 for Catalytic Methane Decomposition

et al. 2016

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“…In turn, the latter can be influenced by preparation conditions [45][46][47][48][49][50][51][52][53][54][55][56].…”

Section: Introductionmentioning

confidence: 99%

On the Role of Morphology of CoFeO₄ Spinel in Methanol Anaerobic Oxidation

et al. 2012

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A CoFe 2 O 4 inverse spinel calcined at two different temperatures (450°C and 750°C), in order to modulate the growth of the crystallites, has been employed in methanol anaerobic oxidation. A correlation between physico-chemical properties and catalytic performances of the material has been pursued. The study of both surface and bulk properties has been carried out by means of different experimental techniques, among which X-ray diffraction (XRD), transmission electron microscopy (TEM), and in situ FTIR spectroscopy. The FTIR study of both bulk and surface spectral features reveals that the calcination step is responsible for the different type of exposed surface sites, and as a consequence, for the different catalytic behaviour. As the use of the spinel as catalyst for methanol transformation into H 2 necessarily implies a regeneration step with steam, in order to recover the oxidative capacity of the solid, both surface and bulk features of the reoxidized solids have been also studied. All results reveal that the two samples, originally morphologically quite different from one another, become very similar after just one redox cycle. Still, it has been also demonstrated that both used materials irreversibly modify their surface properties after the reduction/oxidation process.

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“…Due to their different physical and chemical properties, nano-structured materials have received increasing attention in various fields of science and technology [3][4][5] …”

Section: Introductionmentioning

confidence: 99%

“…Both S/V and specific surface area increase drastically for particles less than 100 nm in diameter. Reduction of the system size may change the chemical reactivity and physical properties such as electrical, thermal, optical and magnetic characteristics [1,2].Due to their different physical and chemical properties, nano-structured materials have received increasing attention in various fields of science and technology [3][4][5] …”

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confidence: 99%

Preparation of nano-MgO using ultrasonic method and its characteristics

Tang

Shi

2008

Eclet. Quim.

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MgO is an important inorganic material, which can be used in many aspects, such as catalyst, toxic-waste remediation agent, adsorbent, and others. In order to make use of MgO, nano-MgO was prepared by ultrasonic method using Mg (CH3COO)2.2H2O as precursor, NaOH aqueous solution as precipitant in this paper. Effect factors on MgO nano-particle size were investigated. Characteristics of samples were measured by TGA, XRD, TEM, and others techniques. The results showed that the size of nano-MgO about 4 nm could be obtained under the following conditions (ultrasonic time 20 min, ultrasonic power 250 W, titration rate of NaOH 0.25 mL/min, NaOH concentration 0.48 mol/L, calcinations temperature 410 °C, calcination time 1.5 h, heating rate of calcination 5 °C/min). It was a very simple and effective method to prepare nano-MgO.

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Mechanochemically synthesized nano-dimensional iron–cobalt spinel oxides as catalysts for methanol decomposition

Cited by 98 publications

References 42 publications

Effect of Ce and Co Addition to Fe/Al2O3 for Catalytic Methane Decomposition

Effect of Ce and Co Addition to Fe/Al2O3 for Catalytic Methane Decomposition

On the Role of Morphology of CoFeO₄ Spinel in Methanol Anaerobic Oxidation

Preparation of nano-MgO using ultrasonic method and its characteristics

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Mechanochemically synthesized nano-dimensional iron–cobalt spinel oxides as catalysts for methanol decomposition

Cited by 98 publications

References 42 publications

Effect of Ce and Co Addition to Fe/Al2O3 for Catalytic Methane Decomposition

Effect of Ce and Co Addition to Fe/Al2O3 for Catalytic Methane Decomposition

On the Role of Morphology of CoFeO4 Spinel in Methanol Anaerobic Oxidation

Preparation of nano-MgO using ultrasonic method and its characteristics

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On the Role of Morphology of CoFeO₄ Spinel in Methanol Anaerobic Oxidation