CeO2 nanowires with high aspect ratio and excellent catalytic activity for selective oxidation of styrene by molecular oxygen

Pal, Provas; Pahari, Sandip Kumar; Sinhamahapatra, Apurba; Jayachandran, M.; Kiruthika, G.V.M.; Bajaj, Hari C.; Panda, Asit Baran

doi:10.1039/c3ra23485a

Cited by 54 publications

(21 citation statements)

References 74 publications

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“…Recently, we have observed that CeO 2 nanoparticles synthesized by the carbonate intermediate showed enhanced catalytic activity. 33,34 In continuation of our previous work, 33−36 herein we report the synthesis of Ni supported CeO 2 catalyst and the partial oxidation of methane to synthesis gas over the synthesized catalyst which can activate methane at 450°C and did not deactivate even after 50 h on stream at 800°C. The catalyst is also stable at a very high reaction temperature.…”

Section: Introductionmentioning

confidence: 81%

Defect-Induced Efficient Partial Oxidation of Methane over Nonstoichiometric Ni/CeO₂ Nanocrystals

et al. 2015

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We report the development of a highly crystalline Ni/CeO 2 catalyst with varying amounts of Ni content using ammonium carbonate complex solution of cerium(IV) at a low temperature. The catalyst was characterized by XRD, XPS, BET-surface area, TEM, and H 2 -TPR analysis. We have observed that the maximum incorporation of Ni in CeO 2 crystal system as the substitution point defect took place up to impregnation of 2.5% Ni, and an almost maximum reduction of unit cell parameter was observed. Further increase in the amount of Ni, the additional Ni may create interstitial point defects with surface defects. The synthesized catalysts showed defect-dependent catalytic activity for low temperature (∼450°C ) methane activation to form synthesis gas. The 7.5 wt % Ni/CeO 2 catalyst showed 98% conversion of methane with 73 and 71% selectivity of CO and H 2 , respectively, at 800°C without any deactivation until 50 h on time on stream. We also believe that with enhancement of Ni loading, the interstitial point defects and the surface defects due to the formation of the Ce−O−Ni−O− layer, with under-coordinated oxygen atom, on the surface may be the possible reason for the high activity of the catalyst with Ni loading between 5 and 7.5 wt %. With further increase of Ni loading, the Ni nanoparticles were formed with the expense of the Ce−O−Ni−O− layer and in-turn decreased the catalytic activity.

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Section: Introductionmentioning

confidence: 81%

Defect-Induced Efficient Partial Oxidation of Methane over Nonstoichiometric Ni/CeO₂ Nanocrystals

et al. 2015

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“…It has been proven that CeO 2 is a good catalytic material in the field of three‐way catalysts because of its better redox properties and high oxygen‐storage capacity 68. The oxygen‐storage capacity is associated with the ability of CeO 2 to undergo facile conversion between Ce 4+ and Ce 3+ 69–71. Besides, the mesoporous structure favors for access of molecules to the active surface of the nanocrystals and mass transport during CO oxidation 44.…”

Section: Resultsmentioning

confidence: 99%

Morphology Control, Growth Mechanism, and Enhanced Catalytic Activity of Mesoporous CeO₂ Microparticles

et al. 2015

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Mesoporous CeO 2 with flowerlike and cottonlike hierarchical structures were prepared through a facile solvothermal strategy by using cerium glycolate as precursors. In the whole synthesis process, the solvothermal reaction time plays an important role in morphology control. Structure and composition information of the corresponding cerium glycolate were obtained and compared by using X-ray diffraction, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, and thermogravimetric analysis. Oriented at-

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“…Control experiment revelled that without catalyst no product was obtained (entry 11), while with commercial MnO 2 desired product not obtained at all (entry 12). We anticipate other redox catalyst like ceria might work for this reaction; we have carried out with our synthesized ceria reaction goes moderately and 51 % of benzoxazole was obtained (entry 13). Lowering the reaction temperature to 120 °C dropped the conversion to 82 % (entry 14).…”

Section: Figurementioning

confidence: 93%

Synthesis of 2‐Arylbenzoxazoles by Hetereogeneous γ‐MnO₂ Catalyzed Redox Reaction of o‐Nitrophenol with Benzyl Alcohols or Benzyl Amines

et al. 2016

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Hetereogeneous γ‐MnO2 Catalyzed Redox Reaction of o‐Nitrophenol with Benzyl Alcohols/ benzyl amines for the synthesis of 2‐Arylbenzoxazoles is described here. Surface active Mn+3 species and the surface O−& O2− species were found to play an important role in the catalytic activity. Catalyst is easy to prepare, economic and can be reused for several times. The procedure is very simple and general and applicable for wide range of substrates to afford 2‐aryl benzoxazole in good to excellent yield.

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CeO2 nanowires with high aspect ratio and excellent catalytic activity for selective oxidation of styrene by molecular oxygen

Cited by 54 publications

References 74 publications

Defect-Induced Efficient Partial Oxidation of Methane over Nonstoichiometric Ni/CeO₂ Nanocrystals

Defect-Induced Efficient Partial Oxidation of Methane over Nonstoichiometric Ni/CeO₂ Nanocrystals

Morphology Control, Growth Mechanism, and Enhanced Catalytic Activity of Mesoporous CeO₂ Microparticles

Synthesis of 2‐Arylbenzoxazoles by Hetereogeneous γ‐MnO₂ Catalyzed Redox Reaction of o‐Nitrophenol with Benzyl Alcohols or Benzyl Amines

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CeO2 nanowires with high aspect ratio and excellent catalytic activity for selective oxidation of styrene by molecular oxygen

Cited by 54 publications

References 74 publications

Defect-Induced Efficient Partial Oxidation of Methane over Nonstoichiometric Ni/CeO2 Nanocrystals

Defect-Induced Efficient Partial Oxidation of Methane over Nonstoichiometric Ni/CeO2 Nanocrystals

Morphology Control, Growth Mechanism, and Enhanced Catalytic Activity of Mesoporous CeO2 Microparticles

Synthesis of 2‐Arylbenzoxazoles by Hetereogeneous γ‐MnO2 Catalyzed Redox Reaction of o‐Nitrophenol with Benzyl Alcohols or Benzyl Amines

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Defect-Induced Efficient Partial Oxidation of Methane over Nonstoichiometric Ni/CeO₂ Nanocrystals

Defect-Induced Efficient Partial Oxidation of Methane over Nonstoichiometric Ni/CeO₂ Nanocrystals

Morphology Control, Growth Mechanism, and Enhanced Catalytic Activity of Mesoporous CeO₂ Microparticles

Synthesis of 2‐Arylbenzoxazoles by Hetereogeneous γ‐MnO₂ Catalyzed Redox Reaction of o‐Nitrophenol with Benzyl Alcohols or Benzyl Amines