Hydrogen Spillover from NiO to the Large Surface Area CeO2–ZrO2 Solid Solutions and Activity of the NiO/CeO2–ZrO2 Catalysts for Partial Oxidation of Methane

Takeguchi, Tatsuya; Furukawa, Shigetoyo; Inoue, Masashi

doi:10.1006/jcat.2001.3249

Cited by 150 publications

(62 citation statements)

References 25 publications

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“…6). Takeguchi et al also observed a reduction peak at 350-600 ºC for a CeO 2 -ZrO 2 solid solution with 25 mol% of Ce which was prepared by the glycothermal method followed by calcination at 400 ºC [34]. CP(20) had a sharp peak at ~260 ºC in addition to a broad peak at 500 ºC.…”

Section: Resultsmentioning

confidence: 93%

Synthesis of CeO2–ZrO2 solid solution by glycothermal method and its oxygen release capacity

Hosokawa

Imamura

Iwamoto

et al. 2011

Journal of the European Ceramic Society

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The glycothermal (GT) reaction of Ce acetate and Zr alkoxide directly yielded CeO2-ZrO2 solid solutions in a region of low Ce content ≤40 mol%. Of the CeO2-ZrO2 solid solutions obtained by the GT method and subsequent calcination at 500 or 800 ºC, the sample with 20 mol% Ce content had the largest BET surface area. This sample exhibited the highest Ce-based oxygen release capacity in the whole Ce/Zr composition range.The oxygen release capacities of CeO 2 -ZrO 2 solid solutions synthesized by the GT method were much larger than those of the samples prepared by a coprecipitation (CP) method. The Rietvelt analysis and the repetitive reduction-oxidation experiment indicated that the CeO 2 -ZrO 2 solid solution synthesized by the GT method has a homogeneous structure as compared with that prepared by the CP method.2

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Section: Resultsmentioning

confidence: 93%

Synthesis of CeO2–ZrO2 solid solution by glycothermal method and its oxygen release capacity

Hosokawa

Imamura

Iwamoto

et al. 2011

Journal of the European Ceramic Society

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“…Usually such peak was assigned to the reduction of "free state" NiO bearing weak interaction with the support [28]. It is noted that value of H 2 /Ni molar ratio is over-stoichiometric (higher than 1) for both Ni/SiO 2 /Ce 0.5 Zr 0.5 O 2 and Ni/Ce 0.5 Zr 0.5 O 2 catalysts, which can be associated with the additional reduction of Ce 0.5 Zr 0.5 O 2 solid solution [78,81].…”

Section: Characterization Of the Catalystsmentioning

confidence: 93%

Application of POSS Nanotechnology for Preparation of Efficient Ni Catalysts for Hydrogen Production

Исмагилов

Матус

Kuznetsov

et al. 2017

Eurasian Chem. Tech. J.

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POSS (polyhedral oligomeric silsesquioxanes) nanotechnology was applied for preparation of efficient Ni catalysts for hydrogen production through autothermal reforming of methane (ATR of CH 4 ). The novel metal-POSS precursor [Nickel (II) -HeptaisobutylPOSS (C 4 H 9 ) 7 Si 7 O 9 (OH)O 2 Ni] of Ni nanoparticles was introduced into Ce 0.5 Zr 0.5 O 2 support with following calcination and reduction stages of activation. The peculiarity of the genesis of Ni/SiO 2 /Ce 0.5 Zr 0.5 O 2 nanomaterials and their characteristics versus deposition mode were studied by X-ray fluorescence spectroscopy, thermal analysis, N 2 adsorption, X-ray diffraction, high-resolution transmission electron microscopy and H 2 temperature-programmed reduction. The two kinds of supported Ni-containing particles were observed: highly dispersed Ni forms (1-2 nm) and large Ni-containing particles (up to 50-100 nm in size). It was demonstrated that the textural, structural, red-ox and, consequently, catalytic properties of ex-Ni-POSS catalysts depend on the deposition mode. The increase of a portion of difficultly reduced Ni 2+ species is found upon application of intermediate calcination during Ni-POSS deposition that has detrimental effect on the activity of catalyst in ATR of CH 4 . The Ni/SiO 2 /Ce 0.5 Zr 0.5 O 2 catalyst prepared by one-step Ni-POSS deposition exhibits the highest H 2 yield -80% at T = 800 °C.

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“…Reaction mechanisms and the effects of starting materials and solvents were dis cussed previously 4),17),32), 33) . Products from solvo thermal synthesis have large surface areas, unique mor phologies and specific surface properties; therefore they show superior catalytic performances, for example, in partial oxidation or autothermal reforming of meth ane 34), 35) , steam reforming of methanol 36) , synthesis of carbon nanotubes by methane decomposition 37) ～40) , and photocatalytic reactions 27)～29), 41) . Here, two recent studies on catalytic applications of solvothermally obtained products are described: the solvothermal synthesis of γ-type Ga2O3 _ Al2O3 solid solutions for selective catalytic reduction (SCR) of NO using methane 21),42)～46)…”

Section: )～4)mentioning

confidence: 99%

ソルボサーマル法を用いる無機材料の合成とその応用

Iwamoto

Inoue

2008

J. Jpn. Petrol. Inst.

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The synthesis of inorganic materials was investigated in organic solvents at temperatures (200-300℃) higher than their boiling points (solvothermal method), and various inorganic materials were directly obtained. The solvo thermal products had high surface areas, superior thermal stabilities, and characteristic morphologies as well as unique surface properties with high potential for catalytic applications. Here, two recent studies on catalytic applications of nanocrystalline mixed oxides synthesized by the solvothermal method are reviewed. First, the solvothermal synthesis of gamma-type Ga2O3 _ Al2O3 solid solutions and their activities for selective catalytic reduction of NO using methane as a reducing agent are described. Ga2O3 _ Al2O3 catalyst prepared in diethylene triamine exhibited quite high activity for this reaction. The physicochemical properties of the catalysts as well as the active sites for this reaction are discussed. Second, the synthesis of nanocrystalline silica-modified titanias with large surface areas and high thermal stabilities by the glycothermal treatment of the mixture of titanium tetra isopropoxide and tetraethyl orthosilicate in 1,4-butanediol is described. The products were characterized by sev eral techniques and the origin of the thermal stability of the products is discussed. The recovery of silicamodified titania particles as xerogels by flash evaporation of the reaction medium after the glycothermal reaction is described. Photocatalytic activities of the products under UV light irradiation and the visible light responsive photocatalytic activity of N-doped silica-modified titanias are also discussed.

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Hydrogen Spillover from NiO to the Large Surface Area CeO2–ZrO2 Solid Solutions and Activity of the NiO/CeO2–ZrO2 Catalysts for Partial Oxidation of Methane

Cited by 150 publications

References 25 publications

Synthesis of CeO2–ZrO2 solid solution by glycothermal method and its oxygen release capacity

Synthesis of CeO2–ZrO2 solid solution by glycothermal method and its oxygen release capacity

Application of POSS Nanotechnology for Preparation of Efficient Ni Catalysts for Hydrogen Production

ソルボサーマル法を用いる無機材料の合成とその応用

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