N2O catalytic decomposition over nano-sized particles of Co-substituted Fe3O4 substrates

Amrousse, Rachid; Tsutsumi, Akimasa; Bachar, Ahmed; Lahcene, Driss

doi:10.1016/j.apcata.2012.10.036

Cited by 55 publications

(32 citation statements)

References 37 publications

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“…The N 2 physisorption isotherms and corresponding pore size distributions for the Co x Ti, TiO 2 , and Co 3 O 4 catalysts are described in Figure . The TiO 2 showed type IV isotherms with a H2 hysteresis loop (Figure a) according to the IUPAC classification, which is typical for mesoporous materials . For the Co 3 O 4 catalyst, the isotherms were type IV isotherms together with the presence of H3‐type hysteresis loop, which is associated with aggregates of particles giving rise to slit‐shaped pores.…”

Section: Resultsmentioning

confidence: 94%

“…studied the decomposition of N 2 O over Cu x Co 1− x Co 2 O 4 spinel‐oxide catalysts. In general, the Co 3 O 4 spinel or Co‐containing spinel catalysts were considered as much better catalysts in the decomposition of N 2 O, however, most of them suffer from significant deactivation with reaction time, especially in the presence of O 2 , H 2 O, and NO in the reactant stream . Hence, development of a suitable Co 3 O 4 ‐based catalysts with high stability and activity for N 2 O decomposition still remains a challenging task for environmental catalysis.…”

Section: Introductionmentioning

confidence: 99%

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Catalytic Decomposition of N₂O over Co–Ti Oxide Catalysts: Interaction between Co and Ti Oxide

Zhang

Sui

et al. 2016

ChemCatChem

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A series of CoxTi catalysts with different Co/Ti molar ratios (x=0.2, 0.4, 0.6, and 0.8) were prepared by the sol‐gel method and used for N2O decomposition. The catalysts were characterized by XRD, X‐ray photoelectron spectroscopy (XPS), TEM, temperature‐programmed reduction with H2, temperature‐programmed desorption of O2, diffuse reflectance UV/Vis, Raman spectra, and N2 adsorption–desorption measurements. The results indicate that the CoxTi catalysts possess high Brunauer–Emmett–Teller (BET) surface area, more surface Co3+, and even better structural stability than Co3O4 as a result of the strong interactions between Co and Ti oxide. Deactivation occurred over time for the Co3O4 catalyst, however, Co0.6Ti maintains nearly 100 % N2O conversion for at least 30 h. Moreover, the Co0.6Ti catalyst showed much stronger resistance against 1.5 vol. % O2, 2.4 vol. % H2O, or 1.6 vol. % NO in the feed compared with the Co3O4 catalyst. The excellent activity of the Co0.6Ti catalyst can be attributed to the higher amount of surface Co3+ derived from the interaction of the Co and Ti oxide in the CoxTi catalysts.

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Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Catalytic Decomposition of N₂O over Co–Ti Oxide Catalysts: Interaction between Co and Ti Oxide

Zhang

Sui

et al. 2016

ChemCatChem

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“…[42][43][44] Various chemical elements can be used as promoting agents. As a rule, in case of spinel-type oxides, alkali, transition metals, and lanthanides are used as promoters, [45][46][47][48][49][50][51][52][53][54][55][56][57][58] while for perovskite-like oxides and hexaaluminates, Ba, Sr, Bi, Sn are often suggested. [36][37][38][59][60][61] Also, in order to decrease the process temperature, the additional reducing agents in a gas mixture can be used, for example, carbon dioxide, methane, and ammonia.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal microwave‐assisted synthesis of LaFeO₃ catalyst for N₂O decomposition

et al. 2020

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Lanthanum orthoferrite powders were synthesized via one-step hydrothermal reactions under mild conditions using microwave and conventional heating. The use of microwave irradiation during the synthesis allows one to obtain nanocrystalline LaFeO 3 with a higher yield and reduced crystallite and particle size within a 16 times shorter duration (3 hours) at a lower temperature of 220°C as compared to the conventional heating. The catalytic decomposition of nitrous oxide was performed over both samples, it was shown that the sample obtained under microwave conditions demonstrates enhanced activity as a catalyst: N 2 O decomposes completely at 700°C over the catalyst formed at microwave conditions, while the comparative catalyst prepared by conventional heating reaches a lower conversion of only 60% at the same temperature and catalytic reaction conditions.

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“…There are many types of catalysts that can be used for N 2 O decomposition including perovskites [11–15], ceria-based catalysts [16–18], spinels [19–21] and iron containing zeolites [22]. In the latter case, H-ZSM-5 has been frequently used as a support [23–25].…”

Section: Introductionmentioning

confidence: 99%

Investigating the Influence of Fe Speciation on N2O Decomposition Over Fe–ZSM-5 Catalysts

et al. 2018

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The influence of Fe speciation on the decomposition rates of N2O over Fe–ZSM-5 catalysts prepared by Chemical Vapour Impregnation were investigated. Various weight loadings of Fe–ZSM-5 catalysts were prepared from the parent zeolite H-ZSM-5 with a Si:Al ratio of 23 or 30. The effect of Si:Al ratio and Fe weight loading was initially investigated before focussing on a single weight loading and the effects of acid washing on catalyst activity and iron speciation. UV/Vis spectroscopy, surface area analysis, XPS and ICP-OES of the acid washed catalysts indicated a reduction of ca. 60% of Fe loading when compared to the parent catalyst with a 0.4 wt% Fe loading. The TOF of N2O decomposition at 600 °C improved to 3.99 × 103 s−1 over the acid washed catalyst which had a weight loading of 0.16%, in contrast, the parent catalyst had a TOF of 1.60 × 103 s−1. Propane was added to the gas stream to act as a reductant and remove any inhibiting oxygen species that remain on the surface of the catalyst. Comparison of catalysts with relatively high and low Fe loadings achieved comparable levels of N2O decomposition when propane is present. When only N2O is present, low metal loading Fe–ZSM-5 catalysts are not capable of achieving high conversions due to the low proximity of active framework Fe3+ ions and extra-framework ɑ-Fe species, which limits oxygen desorption. Acid washing extracts Fe from these active sites and deposits it on the surface of the catalyst as FexOy, leading to a drop in activity. The Fe species present in the catalyst were identified using UV/Vis spectroscopy and speculate on the active species. We consider high loadings of Fe do not lead to an active catalyst when propane is present due to the formation of FexOy nanoparticles and clusters during catalyst preparation. These are inactive species which lead to a decrease in overall efficiency of the Fe ions and consequentially a lower TOF.

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N2O catalytic decomposition over nano-sized particles of Co-substituted Fe3O4 substrates

Cited by 55 publications

References 37 publications

Catalytic Decomposition of N₂O over Co–Ti Oxide Catalysts: Interaction between Co and Ti Oxide

Catalytic Decomposition of N₂O over Co–Ti Oxide Catalysts: Interaction between Co and Ti Oxide

Hydrothermal microwave‐assisted synthesis of LaFeO₃ catalyst for N₂O decomposition

Investigating the Influence of Fe Speciation on N2O Decomposition Over Fe–ZSM-5 Catalysts

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N2O catalytic decomposition over nano-sized particles of Co-substituted Fe3O4 substrates

Cited by 55 publications

References 37 publications

Catalytic Decomposition of N2O over Co–Ti Oxide Catalysts: Interaction between Co and Ti Oxide

Catalytic Decomposition of N2O over Co–Ti Oxide Catalysts: Interaction between Co and Ti Oxide

Hydrothermal microwave‐assisted synthesis of LaFeO3 catalyst for N2O decomposition

Investigating the Influence of Fe Speciation on N2O Decomposition Over Fe–ZSM-5 Catalysts

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Catalytic Decomposition of N₂O over Co–Ti Oxide Catalysts: Interaction between Co and Ti Oxide

Catalytic Decomposition of N₂O over Co–Ti Oxide Catalysts: Interaction between Co and Ti Oxide

Hydrothermal microwave‐assisted synthesis of LaFeO₃ catalyst for N₂O decomposition