Search results for: Takehiko Ono

Items from 1 to 9 out of 9 results

article

Roles of bulk γ(L)-Bi2MoO6 and surface β-Bi2Mo2O9 in the selective catalytic oxidation of C3H6

Takehiko Ono, Kazuya Utsumi, Satoshi Tsukamoto, Hiroyuki Tamaru, more

Journal of Molecular Catalysis. A, Chemical > 2010 > 318 > 1-2 > 94-100

γ(L)-Bi ₂ MoO ₆ (L: low temperature phase) catalysts, whose surface compositions have a Mo/Bi ratio above=0.5, exhibited high selectivity in the partial oxidation of C ₃ H ₆ , while catalysts with Mo/Bi surface ratios near or below=0.5 exhibited low selectivity. γ(L)-phase catalysts which have Mo/Bi surface ratios greater than=0.5, were demonstrated to form β-Bi ...

article

Partial oxidation of CH4 over Al/silica catalysts using molecular oxygen

Takehiko Ono, Minoru Nakamura, Kenji Unno, Adiya Oyun, more

Journal of Molecular Catalysis. A, Chemical > 2008 > 285 > 1-2 > 169-175

Partial oxidation of CH ₄ using molecular oxygen has been carried out over various commercial silicas and alumina doped silica catalysts using a flow reactor system. Partial oxidation products such as C ₂ H ₆ , C ₂ H ₄ , HCHO, CH ₃ OH, and CO were formed over these catalysts as well as over a quartz reactor only. The presence of Al ions in silica remarkably...

article

Comparison of activities in selective catalytic reduction of NO _x by C ₃ H ₈ over Co/MFI, Fe/MFI, and H/MFI zeolite catalysts

Hiroto Imai, Toshiyuki Ogawa, Kazuo Sugimoto, Masakazu Kataoka, more

Applied Catalysis B: Environmental > 2005 > 55 > 4 > 259-265

The Co/MFI(SiO ₂ /Al ₂ O ₃ = 30) were prepared by a precipitation method with NaOCl in alkali solutions exhibited high activities to N ₂ at 250 ^o C for the selective catalytic reduction (SCR) of NO _x . These catalysts showed two UV-vis bands at 700 and 400nm, indicating the presence of octahedral Co(III) as well as tetrahedral Co(II). The high SCR activity...

article

A study of active sites for partial oxidation on α-Bi ₂ Mo ₃ O ₁ ₂ and β-Bi ₂ Mo ₂ O ₉ catalysts using crystal structure visualization

Takehiko Ono, Kazuya Utsumi, Masakazu Kataoka, Yumo Tanaka, more

Catalysis Today > 2004 > 91-92 > Complete > 181-184

The unit cells of α-Bi ₂ Mo ₃ O ₁ ₂ , β-Bi ₂ Mo ₂ O ₉ , and γ(H)-Bi ₂ MoO ₆ are visualized by the crystal structure application. These oxides have twin Mo tetrahedra structures. The visualization clarified that Mo ions of twin Mo tetrahedra and some Bi ions with these Bi-Mo oxides lie on the same plane. It is proposed that the active...

article

A study of active sites for alkene and alkane oxidation over Mo and V mixed oxide catalysts using 18O tracer and Raman spectroscopy

Takehiko Ono, Nobuaki Ogata, Hideo Numata, Yasuhiro Miyaryo

Topics in Catalysis > 2001 > 15 > 2-4 > 229-234

The oxygen ions of MoO₃, V₂O₅, β-VOPO₄, α-Mg₂V₂O₇, β-CoMoO₄and α-Bi₂Mo₃O₁₂were exchanged with ¹⁸O via a reduction–oxidation method and the catalytic oxidation of alkene or alkane using ¹⁸O₂. The Raman bands of the catalysts shifted to lower frequencies by the exchange with ¹⁸O tracer. With MoO₃, V₂O₅, β-VOPO₄and α-Mg₂V₂O₇, the weak oxygen bonds were active to exchange, i.e., to be active for the oxygen...

article

Characterization of K-mixed V2O5 catalyst and oxidative dehydrogenation of propane on it

Takehiko Ono, Yuhmo Tanaka, Takayoshi Takeuchi, Kouji Yamamoto

Journal of Molecular Catalysis. A, Chemical > 2000 > 159 > 2 > 293-300

The structure of K containing V ₂ O ₅ catalysts has been studied by XRD and spectroscopic methods. The particles of V ₂ O ₅ were oriented sharply to the direction perpendicular to b axis. The spacings of (010) and (200) planes were slightly contracted by the presence of K ions. V ₂ O ₅ bronze seemed to be less Raman-active. IR spectra gave the structural...

article

Tracer Studies of Olefin Oxidation over an α-Bi2Mo3O12Catalyst Using Laser Raman and Microwave Spectroscopy

Takehiko Ono, Nobuaki Ogata, Robert L. Kuczkowski

Journal of Catalysis > 1998 > 175 > 2 > 185-193

The oxide oxygen of α-Bi ₂ Mo ₃ O ₁₂ was exchanged via olefin oxidation using ¹⁸ O ₂ . Band shifts in the Raman spectra of the catalyst were examined. In the oxidation of propene and trans-but-2-ene, the bands at 865 and 845 cm ⁻¹ of α-Bi ₂ Mo ₃ O ₁₂ were shifted preferentially. Oxygen insertion apparently takes place at the vacancies...

article

Redox features of β-VOPO ₄ catalyst using ¹ ⁸ O tracer and laser Raman spectroscopy

Hideo Numata, Takehiko Ono

Journal of Molecular Catalysis. A, Chemical > 1998 > 130 > 3 > 261-269

The oxygen ions of the β-VOPO ₄ catalyst were exchanged with an ¹ ⁸ O tracer by a reduction-oxidation method and by a catalytic oxidation of but-1-ene using ¹ ⁸ O ₂ . The bands at 992 and 900 cm ^- ¹ were more shifted to lower frequencies than those at 1076 and 1002 cm ^- ¹ . Applying the correlation between the Raman bands and stretching...

article

Characteristic Features of Raman Band Shifts of Scheelite-Type Molybdate Catalysts Exchanged with the18O Tracer via Redox Reactions

Takehiko Ono, Nobuaki Ogata, Yasuhiro Miyaryo

Journal of Catalysis > 1996 > 161 > 1 > 78-86

The oxide oxygen of scheelite-type α-MnMoO ₄ , β-CoMoO ₄ , and α-Bi ₂ Mo ₃ O ₁₂ were exchanged with the ¹⁸ O tracer using a reduction–oxidation method. The Raman band shifts in the spectra of these catalysts were examined. Normal coordination analysis and diatomic approximation reported in previous literature have shown that the Raman bands are correlated...

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