Catalytic Removal of Toluene over Co3O4–CeO2 Mixed Oxide Catalysts: Comparison with Pt/Al2O3

Liotta, Leonarda Francesca; Ousmane, M.; Carlo, Gabriella Di; Pantaleo, G.; Deganello, G.; Boréave, A.; Giroir‐Fendler, A.

doi:10.1007/s10562-008-9640-0

Cited by 130 publications

(79 citation statements)

References 24 publications

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“…However, due to the high cost of noble metals, many researchers have recently devoted strong efforts to the development of suitable catalysts containing only transition metal oxides [6][7][8][9][10]. In this domain, special attention has been focused on cobalt materials in the spinel form [10], on oxide catalysts [11,12] and on mixed oxides issued from hydrotalcite precursors [13,14]. For the generation of well-dispersed, active and very stable mixed oxides, the Layered Double Hydroxides (LDH) route shows much potential.…”

Section: Introductionmentioning

confidence: 99%

Co-Al Mixed Oxides Prepared via LDH Route Using Microwaves or Ultrasound: Application for Catalytic Toluene Total Oxidation

et al. 2015

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Co6Al2HT hydrotalcite-like compounds were synthesized by three different methods: co-precipitation, microwaves-assisted and ultrasound-assisted methods. The mixed oxides obtained after calcination were studied by several techniques: XRD, TEM, H2-TPR and XPS. They were also tested as catalysts in the reaction of total oxidation of toluene. The physico-chemical studies revealed a modification of the structural characteristics (surface area, morphology) as well as of the reducibility of the formed mixed oxides. The solid prepared by microwaves-assisted synthesis was the most active. Furthermore, a relationship between the ratio of Co 2+ on the surface, the reducibility of the Co-Al mixed oxide and the T50 in toluene oxidation was demonstrated. This suggests a Mars Van Krevelen mechanism for toluene total oxidation on these catalysts.

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Section: Introductionmentioning

confidence: 99%

Co-Al Mixed Oxides Prepared via LDH Route Using Microwaves or Ultrasound: Application for Catalytic Toluene Total Oxidation

et al. 2015

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“…High lattice oxygen mobility and formation of surface anionic vacancies in such a Co 3 O 4 -CeO 2 system were also relevant to propene and toluene oxidation activity. 22,23 On these grounds, Co 3 O 4 -based catalysts are definitely good candidates for oxidation reactions; however, deactivation processes induced by high temperature, such as loss of surface area, thermal decomposition to the less active CoO and interactions of cobalt with the matrix leading to inactive phases (i.e., CoAl 2 O 4 , CoTiO 3 , CoZr 3 O 0.69 ), limit its application at high temperatures. 5,21,24,25 Therefore, deposition of Co 3 O 4 active sites over a high surface area carrier is attractive to achieve high catalytic performance and long-term stability.…”

Section: Introductionmentioning

confidence: 99%

Co₃O₄ particles grown over nanocrystalline CeO₂: influence of precipitation agents and calcination temperature on the catalytic activity for methane oxidation

Pantaleo

Carlo

et al. 2015

Catal. Sci. Technol.

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aCrystalline cobalt oxides were prepared by a precipitation method using three different precipitation agents, ĲNH 4 ) 2 CO 3 , Na 2 CO 3 and COĲNH 2 ) 2 . Cobalt oxide nanoparticles corresponding to a Co 3 O 4 loading of 30 wt% were also deposited over high-surface area nanocrystalline ceria by the same precipitation agents. The effect of calcination temperature, 350 or 650°C, on the morphological and structural properties was evaluated. Characterization by BET, XRD, SEM, TEM, Raman spectroscopy, H 2 -TPR, XPS and NH 3 -TPD was performed and the catalytic properties were explored in the methane oxidation reaction. The nature of the precipitation agent strongly influenced the textural properties of Co 3 O 4 and the Co 3 O 4 -CeO 2 interface. The best control of the particle size was achieved by using COĲNH 2 ) 2 that produced small and regular crystallites of Co 3 O 4 homogeneously deposited over the CeO 2 surface. Such a Co 3 O 4 -CeO 2 system precipitated by urea showed enhanced low-temperature reducibility and high surface Co 3+ concentration, which were identified as the key factors for promoting methane oxidation at low temperature. Moreover, the synergic effect of cobalt oxide and nanocrystalline ceria produced stable full conversion of methane in the entire range of investigated temperature, up to 700-800°C, at which Co 3 O 4 deactivation usually occurs.

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“…One of the main problems during this process concerns the emissions of pollutants when the system has not reached its working temperature, also called cold start period. The majority of the emissions are produced after the starting of the vehicle engine when the temperature in the exhaust system is lower than 425 K. For the catalytic oxidation of carbon monoxide, the Pd or Pt-based catalysts do not bring a total conversion at this temperature [24,25]. Understanding how the catalyst works in order to improve its catalytic activity at low temperature is thus of great importance.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Processes on Gold-Based Catalysts Followed by Environmental Microscopies

et al. 2017

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Abstract:Since the early discovery of the catalytic activity of gold at low temperature, there has been a growing interest in Au and Au-based catalysis for a new class of applications. The complexity of the catalysts currently used ranges from single crystal to 3D structured materials. To improve the efficiency of such catalysts, a better understanding of the catalytic process is required, from both the kinetic and material viewpoints. The understanding of such processes can be achieved using environmental imaging techniques allowing the observation of catalytic processes under reaction conditions, so as to study the systems in conditions as close as possible to industrial conditions. This review focuses on the description of catalytic processes occurring on Au-based catalysts with selected in situ imaging techniques, i.e., PEEM/LEEM, FIM/FEM and E-TEM, allowing a wide range of pressure and material complexity to be covered. These techniques, among others, are applied to unravel the presence of spatiotemporal behaviours, study mass transport and phase separation, determine activation energies of elementary steps, observe the morphological changes of supported nanoparticles, and finally correlate the surface composition with the catalytic reactivity.

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Catalytic Removal of Toluene over Co3O4–CeO2 Mixed Oxide Catalysts: Comparison with Pt/Al2O3

Cited by 130 publications

References 24 publications

Co-Al Mixed Oxides Prepared via LDH Route Using Microwaves or Ultrasound: Application for Catalytic Toluene Total Oxidation

Co-Al Mixed Oxides Prepared via LDH Route Using Microwaves or Ultrasound: Application for Catalytic Toluene Total Oxidation

Co₃O₄ particles grown over nanocrystalline CeO₂: influence of precipitation agents and calcination temperature on the catalytic activity for methane oxidation

Dynamic Processes on Gold-Based Catalysts Followed by Environmental Microscopies

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Catalytic Removal of Toluene over Co3O4–CeO2 Mixed Oxide Catalysts: Comparison with Pt/Al2O3

Cited by 130 publications

References 24 publications

Co-Al Mixed Oxides Prepared via LDH Route Using Microwaves or Ultrasound: Application for Catalytic Toluene Total Oxidation

Co-Al Mixed Oxides Prepared via LDH Route Using Microwaves or Ultrasound: Application for Catalytic Toluene Total Oxidation

Co3O4 particles grown over nanocrystalline CeO2: influence of precipitation agents and calcination temperature on the catalytic activity for methane oxidation

Dynamic Processes on Gold-Based Catalysts Followed by Environmental Microscopies

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Co₃O₄ particles grown over nanocrystalline CeO₂: influence of precipitation agents and calcination temperature on the catalytic activity for methane oxidation