Susumu Tsubota

National Institute of Advanced Industrial Science and Technology

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M. Haruta

National Institute of Advanced Industrial Science and Technology

Masatake Haruta

Tokyo Metropolitan University

Mitsutaka Okumura

Osaka University

Tomoki Akita

National Institute of Advanced Industrial Science and Technology

Masakazu Daté

National Institute of Advanced Industrial Science and Technology

Sindhu Seelan

International Medical University

Tetsuhiko Kobayashi

University of Electro-Communications

Anil K. Sinha

Academy of Scientific and Innovative Research

Juan J. Bravo-Suárez

University of Kansas

Naoki Mimura

National Institute of Advanced Industrial Science and Technology

Cooperative Institutions

National Institute of Advanced Industrial Science and Technology

Midorigaoka Hospital

Osaka University

Kyoto University

Japan Science and Technology Agency

Kyoto Institute of Technology

The University of Tokyo

Kyushu University

Kobe University

National Tsing Hua University

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Hydrophobicity induced vapor-phase oxidation of propene over gold supported on titanium incorporated hybrid mesoporous silsesquioxane

Chemical Communications (2002)

Mahendra P. Kapoor Anil K. Sinha Sindhu Seelan Shinji Inagaki Susumu Tsubota

Gold nanoparticles supported on highly hydrophobic ethane bridged Ti incorporated mesoporous organosilica are reported for enhanced vapor phase epoxidation of propene using H2 and O2.

Silsesquioxane

Propene

Vapor phase

10.1039/b209392h

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Citations (84)

In situ measurements under flow condition of the CO oxidation over supported gold nanoparticles

Catalysis Today (2007)

Masakazu Daté H. Imai Susumu Tsubota M. Haruta

10.1016/j.cattod.2007.01.032

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Citations (43)

Novel Ion-sensitive Field-effect Transistor with Ion Sensing Polymerized Silsesquioxane Membrane on Detachable Metal Disk

Electrochemistry (2007)

Yutaka Tsujimura Susumu Tsubota Ken Sasaki Hajime Karatani

We developed a new type of an ion-sensitive field-effect transistor (ISFET) with an ion sensing polymerized silsesquioxane (polySQ) membrane carrying a quaternary ammonium salt (QAS) as an ionophore. A noticeable feature of this ISFET is that the metal disc part is designed to be detachable from an FET body. Owing to this structure, the full polymerization of SQ at relatively high temperature became possible; leading to preparation of a durable ion sensing polySQ membrane on a metal disk connected to the FET gate terminal. The ISFET with the polySQ membrane carrying QAS (polySQ-QAS) (optimal content of QAS, 40 wt% in the matrix), prepared at 150°C for 3 h, showed not only the theoretical potential response to the nitrate ion concentration in the range of 1.0 × 10−6 to 0.10 mol dm−3 (M) with the Nernst slop of −61.5 mV·decade−1, but also the rapid response (3 s for 90% of response). Furthermore, the ion sensing property is favorably sustained even after being soaked in methanol for 24 h.

ISFET

Silsesquioxane

10.5796/electrochemistry.75.472

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Citations (2)

Low-temperature catalytic combustion of methanol and its decomposed derivatives over supported gold catalysts

Catalysis Today (1996)

M. Haruta Atsushi Ueda Susumu Tsubota Rosa M. Torres Sánchez

Catalytic combustion

10.1016/0920-5861(95)00318-5

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Citations (167)

Kinetics of propylene epoxidation using H2 and O2 over a gold/mesoporous titanosilicate catalyst

Catalysis Today (2007)

Ji-Qing Lu Xiaoming Zhang Juan J. Bravo-Suárez Susumu Tsubota Jason R. Gaudet

Propylene oxide

Titanium Dioxide

10.1016/j.cattod.2007.02.005

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Citations (75)

Effect of the Addition of Nitrogen Dioxide on the Gas-Phase Partial Oxidation of Methane with Oxygen under Normal Pressures

Chemistry Letters (1995)

Li‐Biao Han Susumu Tsubota Masatake Haruta

Abstract The addition of NO2 to the gas-phase reaction of CH4 with O2 conducted under normal pressures at temperatures of 400∼460 °C enhances the partial oxidation of methane with improved selectivities to organic products.

Partial oxidation

Partial pressure

Carbon dioxide reforming

10.1246/cl.1995.931

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Citations (23)

Catalyst regeneration and activity enhancement of Au/TiO2 by atmospheric pressure nonthermal plasma

Applied Catalysis A General (2007)

Hyun‐Ha Kim Susumu Tsubota Masakazu Daté Atsushi Ogata Shigeru Futamura

Nonthermal plasma

10.1016/j.apcata.2007.06.029

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Citations (62)

The Relationship between the Structure and Activity of Nanometer Size Gold When Supported on Mg(OH)2

Journal of Catalysis (1998)

D. Cunningham W. Vogel Hiroyuki Kageyama Susumu Tsubota M. Haruta

Debye function

Nanometre

10.1006/jcat.1998.2050

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Citations (166)

Surface Characterization Study of Au/α-Fe₂O₃and Au/Co₃O₄Low-Temperature CO Oxidation Catalysts

The Journal of Physical Chemistry (1996)

William S. Epling Gar B. Hoflund Jason F. Weaver Susumu Tsubota Masatake Haruta

Au/α-Fe2O3 and Au/Co3O4 catalysts prepared by coprecipitation with a nominal 10 atom % Au are active for CO oxidation even at temperatures below 0 °C. The surfaces of these as-prepared, powdered catalysts have been examined using X-ray photoelectron spectroscopy (XPS) and ion-scattering spectroscopy (ISS) to gain information about the composition, morphology, and chemical states of the species present at these surfaces. The nature of the Au is complex. The near-surface region of the Au/α-Fe2O3 catalyst contains more Au than that of the Au/Co3O4 catalyst. The Au is present as crystallites, and small amounts of Au(OH)3 are also present on the Au/Co3O4 catalyst. The ISS data indicate that a thin layer of metallic Au, which covers most of the iron oxide substrate, is present on the Au/α-Fe2O3 catalyst surface. This layer is removed rapidly by ion sputtering, leaving the larger Au crystallites on the surface.

Coprecipitation

Low-energy ion scattering

10.1021/jp960593t

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Citations (193)

Formation of methanol by the gas phase partial oxidation of methane under normal pressures

Journal of the Chemical Society Chemical Communications (1995)

Li‐Biao Han Susumu Tsubota Tetsuhiko Kobayashi Masatake Haruta

Even under normal pressures (1.5–3.0 atm), methanol is formed by the gas phase reaction of methane with oxygen in a flow quartz reactor at 425–490 °C with methanol selectivities exceeding 30% at a methane conversion of 5%.

Partial oxidation

10.1039/c39950000093

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Citations (15)