A magnetic resonance study of the Fe2O3/Al2O3 catalyst in a CO-N2O reaction.

スポンサーリンク

概要

• 論文の詳細を見る

• A magnetic resonance study was performed in order to determine the phase of iron oxide supported on Al<SUB>2</SUB>O<SUB>3</SUB> and to measure <I>in situ</I> the surface conditions during the reaction. The irreversible transition of α-Fe<SUB>2</SUB>O<SUB>3</SUB> into Fe<SUB>3</SUB>O<SUB>4</SUB> by the reduction of the supported catalyst and the reversible transition between Fe<SUB>3</SUB>O<SUB>4</SUB> and γ-Fe<SUB>2</SUB>O<SUB>3</SUB> were confirmed at 280 °C. The spectrum appearing at <I>g</I>=2.03 and having the line width of about 1000 gauss clearly showed ferrimagnetic behavior; it could be attributed to the ferrimagnetic resonance (FMR) of Fe<SUB>3</SUB>O<SUB>4</SUB> and/or γ-Fe<SUB>2</SUB>O<SUB>3</SUB>. Kinetic study suggested that the CO–N<SUB>2</SUB>O reaction took place in the oxidation-reduction mechanism. The concentration of γ-Fe<SUB>2</SUB>O<SUB>3</SUB> was calculated from not only the kinetic equation, but also the <I>in situ</I> measurement of the FMR signal; these values were consistent. The γ-Fe<SUB>2</SUB>O<SUB>3</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB> had nearly the same activity as the α-Fe<SUB>2</SUB>O<SUB>3</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB>, whereas the unsupported γ-Fe<SUB>2</SUB>O<SUB>3</SUB> had a lower activity than the α-Fe<SUB>2</SUB>O<SUB>3</SUB>. Such a difference in catalytic activity was discussed in comparison with other oxidation reactions.

• 公益社団法人 日本化学会の論文

著者

• MURAKAMI Yuichi

  Department of Applied Chemistry, School of Engineering, Nagoya University

• Niwa Miki

  Department Of Chemistry And Biotechnology Graduate School Of Engineering Tottori University

• Yagi Kunihiko

  Department of Synthetic Chemistry, Faculty of Engineering, Nagoya University

関連論文

• Periodic DFT Calculation of the Energy of Ammonia Adsorption on Zeolite Bronsted Acid Sites to Support the Ammonia IRMS-TPD Experiment
• A New SOx Deactivation-Free NOx Reduction System Using Rh/Alumina and Periodical Rich and Lean Conditions
• Active and Reusable Catalyst in the Friedel-Crafts Alkylation Derived from a Heteropoly Acid
• Selective Catalytic Reduction of NO by Methane over Pd Loaded on Heteropolyacids/SiO_2 at Low Temperature
• Determination of the Acid Strength of Binary Oxide Catalysts Using Temperature-Programmed Desorption of Pyridine
• Unique Temperature Dependence of Acetic Acid Formation in CO_2 Hydrogenation on Ag-promoted Rh/SiO_2 Catalyst
• Catalytic Reduction of Carbon Dioxide on Zn-loaded HZSM-5 Accompanying Aromatization of Propane
• Studies on the Formation and Structure of Highly Dispersed PdO Interacted with Bronsted Acid Sites of Zeolite by EXAFS
• Shape-Selective Adsorption of Substituted Benzaldehyde Isomers by a Molecular Sieving Silica Overlayer Prepared by the Chemical Vapor Deposition Method Using Organic Template on Tin Oxide
• Formation of Selective Adsorption Cavity by Chemical Vapor Deposition of Molecular Sieving Silica Overlayer on Alumina using Molecular Template in the Presence of Acetic Acid
• A Continuous-Flow Method for Chemical Vapor Deposition of Tetramethoxysilane on γ-Alumina to Prepare Silica Monolayer Solid Acid Catalyst
• Spontaneous Dispersion of PdO onto Acid Sites of Zeolites Studied by in situ DXAFS
• Enhancement of Tolerance to the Humidity by Chemical Vapor Deposition of Silicon Alkoxide on Pd-Mordenite Catalyst in the Reaction of NO, Methane and Oxygen
• Quantitative Measurements of Bronsted Acidity of Zeolites by Ammonia IRMS-TPD Method and Density Functional Calculation
• Distribution of Acid Sites in Mordenite
• Improvement of the Catalytic Performance of Pd/WO_3/ZrO_2 in the Selective NO-CH_4-O_2 Reaction by the Addition of Water Vapor
• Generation and Identification of Strong Acid Sites in AIMCM-41 Prepared by Gel Equilibrium Adjustment Method
• Studies on the Structure and Acid Properties of GaMCM-41 Mesoporous Molecular Sieve
• Molecular-Sieving Gas Sensor Prepared by Chemical Vapor Deposition of Silica on Tin Oxide Using an Organic Template
• Layered Nb_2O_5-WO_x Sheet Catalyst Composed of Nanofibers That Are Active in Friedel-Crafts Reactions
• Enhancement in Cracking Activity of USY Zeolites Treated with Ammonium Nitrate Solution
• Temperature-programmed desorption of ammonia on zeolites. Influence of the experimental conditions on the acidity measurement.
• Diffuse Bilateral Hemangiosarcoma of the Uterus in a Dog
• Oxidation of ammonia with lattice oxygen of metal oxides by pulse reaction technique.
• The oxidation of carbon monoxide on Pt/Al2O3 containing a metal oxide.
• Selective reduction of nitrogen monoxide with hydrogen on Pt/Al2O3 containing a metal oxide.
• ESR spectra of nitric oxide adsorbed on ZrO2, CeO2, and ThO2.
• Bifunctional oxidation of ammonia with metal oxide-Pt/Al2O3 mechanical mixtures.
• Quantitative interpretation of infrared diffuse reflectance spectra over whole concentration range.
• A magnetic resonance study of the Fe2O3/Al2O3 catalyst in a CO-N2O reaction.

もっと見る 閉じる

スポンサーリンク