Wyniki wyszukiwania dla: Yasushi Sekine

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Steam reforming of dimethyl ether promoted by surface protonics in an electric field

Reona Inagaki, Ryo Manabe, Yudai Hisai, Yukiko Kamite, więcej

International Journal of Hydrogen Energy > 2018 > 43 > 31 > 14310- 14318

The catalytic steam reforming of dimethyl ether (DME) in an electric field was carried out and the effects of proton hopping induced by the electric field on a Pd-supported CeO₂ catalyst surface were investigated. The hydrolysis of DME was promoted even on Pd/CeO₂ catalyst by the application of the electric field at low temperatures (in the range of 423–623 K), while the direct decomposition of DME...

artykuł

Ammonia Synthesis Over Co Catalyst in an Electric Field

Ami Gondo, Ryo Manabe, Ryuya Sakai, Kota Murakami, więcej

Catalysis Letters > 2018 > 148 > 7 > 1929-1938

Ammonia is an important chemical feedstock and is produced by Ru or Fe catalyst so far. We investigated Co catalyst for low temperature ammonia synthesis in an electric field. Well-reduced Co/Ce_0.5Zr_0.5O₂ catalyst showed high activity for ammonia synthesis even at 473 K in the electric field. Various characterizations including kinetic tests, operando DRIFTS measurements, TEM observations, and XAFS...

artykuł

Elucidation of the role of electric field on low temperature ammonia synthesis using isotopes

Kota Murakami, Ryo Manabe, Hideaki Nakatsubo, Tomohiro Yabe, więcej

Catalysis Today > 2018 > 303 > C > 271-275

We have found that an electric field brings high yield on low temperature catalytic ammonia synthesis over Cs/Ru/SrZrO₃ catalyst. The role of the electric field is investigated based on kinetics and isotope effects.Results show that the electric field promotes proton hopping on the catalyst surface, and it brings a change in the reaction mechanism from the conventional one to the N₂H⁺ intermediate...

artykuł

Evaluating surface protonic transport on cerium oxide via electrochemical impedance spectroscopy measurement

Ryo Manabe, Sindre Østby Stub, Truls Norby, Yasushi Sekine

Solid State Communications > 2018 > 270 > C > 45-49

Surface protonic transport on cerium oxide (CeO₂) was investigated using electrochemical impedance spectroscopy (EIS). CeO₂ pellets showing low relative density: approximately 60%, was prepared for the purpose. The structure and morphology of the prepared CeO₂ pellets were confirmed from XRD and SEM measurements. Results show that the pellets had a pure cubic phase, with open pores on which water...

artykuł

Preferential dealumination of Zn/H-ZSM-5 and its high and stable activity for ethane dehydroaromatization

Hikaru Saito, Satoshi Inagaki, Kiria Kojima, Qiao Han, więcej

Applied Catalysis A: General > 2018 > 549 > C > 76-81

The effect of steam treatment on Zn/H-ZSM-5 catalysts prepared by an ion-exchange method for non-oxidative ethane dehydroaromatization was investigated. Steam treatment of Zn/H-ZSM-5 after Zn loading improved its catalytic stability on aromatic hydrocarbon formation including benzene, toluene and xylene. Temperature programmed oxidation measurements demonstrated that the steam treatment brought suppression...

artykuł

Catalytic oxidative conversion of methane and ethane over polyoxometalate-derived catalysts in electric field at low temperature

Shuhei Ogo, Kousei Iwasaki, Kei Sugiura, Ayaka Sato, więcej

Catalysis Today > 2018 > 299 > C > 80-85

We examined oxidative coupling of methane (OCM) and oxidative dehydrogenation of ethane (ODE) over various polyoxometalate supported CeO₂ catalysts at 423K in an electric field. Tetrabutylammonium (TBA) salt of Keggin-type phosphotungstate (PW₁₂O₄₀) supported CeO₂ catalysts ((TBA)₃PW₁₂O₄₀/CeO₂) showed high activities for OCM and ODE in the electric field (3mA) at 423K, although the catalyst without...

artykuł

Effects of Mn addition on dehydrogenation of methylcyclohexane over Pt/Al2O3 catalyst

Atsushi Nakano, Shota Manabe, Takuma Higo, Hirofumi Seki, więcej

Applied Catalysis A: General > 2017 > 543 > C > 75-81

Methylcyclohexane (MCH) is a prospective hydrogen carrier candidate. Although Pt/Al₂O₃ catalyst shows high conversion for dehydrogenation of MCH at 623K, methane formation and deactivation caused by coke deposition are issues over the catalyst. Results of this study demonstrate that Mn addition to Pt/Al₂O₃ brought higher selectivity and stability for dehydrogenation of MCH than with Pt/Al₂O₃ alone...

artykuł

Low-temperature oxidative coupling of methane in an electric field using carbon dioxide over Ca-doped LaAlO3 perovskite oxide catalysts

Tomohiro Yabe, Yukiko Kamite, Kei Sugiura, Shuhei Ogo, więcej

Journal of CO 00002 Utilization > 2017 > 20 > C > 156-162

Methane conversion was conducted over various perovskite oxide catalysts at 423K using carbon dioxide as an oxidant in an electric field. La_0.7Ca_0.3AlO_3-δ catalyst showed high CO₂-OCM activity. The highest CO₂-OCM activity, C₂ yield of 7.4%, was obtained even at 348K, that value was higher than those of other earlier reports. Dry reforming of methane to produce syngas (H₂+CO) proceeded simultaneously,...

artykuł

Anchoring effect and oxygen redox property of Co/La0.7Sr0.3AlO3-δ perovskite catalyst on toluene steam reforming reaction

Kent Takise, Shota Manabe, Keisuke Muraguchi, Takuma Higo, więcej

Applied Catalysis A: General > 2017 > 538 > C > 181-189

To elucidate specific functions of supports, we investigated steam reforming of toluene as a model compound of biomass tar over Co catalyst supported on perovskite-type oxide. Co-supported La_0.7Sr_0.3AlO_3-δ catalyst showed the highest activity among various Co-supported catalysts. STEM measurements and XPS measurements revealed the coexistence of La cation and lattice oxygen defect produces an anchoring...

artykuł

Low-temperature dry reforming of methane to produce syngas in an electric field over La-doped Ni/ZrO2 catalysts

Tomohiro Yabe, Kenta Mitarai, Kazumasa Oshima, Shuhei Ogo, więcej

Fuel Processing Technology > 2017 > 158 > C > 96-103

Dry reforming of methane (DRM) was conducted over various transition metal supported ZrO₂ catalysts in an electric field. Catalyst of 1wt%Ni/10mol%La-ZrO₂ showed high DRM activity even at 423K of external temperature, at which no DRM proceeds in the conventional catalytic systems. By virtue of the low reaction temperature, low amounts of carbon deposition were confirmed even in conditions of high...

artykuł

Promotive effect of Ba addition on the catalytic performance of Ni/LaAlO3 catalysts for steam reforming of toluene

Takuma Higo, Hikaru Saito, Shuhei Ogo, Yukihiro Sugiura, więcej

Applied Catalysis A: General > 2017 > 530 > C > 125-131

Ba addition to supported Ni catalysts was investigated on steam reforming of toluene, as a model compound of biomass tar. Ba addition showed drastic promotive effects on catalytic activity and tolerance against oxidation. Various catalytic tests and characterization were conducted, including pressure dependence, Arrhenius plots, STEM and XAFS observations, dispersion of supported Ni, and temperature...

artykuł

Pre-reduction and K loading effects on noble metal free Co-system catalyst for water gas shift reaction

Tomohiro Majima, Eugene Kono, Shuhei Ogo, Yasushi Sekine

Applied Catalysis A: General > 2016 > 523 > C > 92-96

Water gas shift (WGS) reaction over a noble metal free Co-system catalyst was investigated. Although K/Co₃O₄ showed no WGS activity with no pre-treatment, it showed high and stable activity after reduction by CO+H₂ (syngas). Moreover, the high activity was retained even after post-treatment in water vapor. Characterization of the catalyst was conducted using XRD, XPS, and XAFS, which revealed that...

artykuł

Highly active and stable Co/La0.7Sr0.3AlO3−δ catalyst for steam reforming of toluene

Kent Takise, Takuma Higo, Daiki Mukai, Shuhei Ogo, więcej

Catalysis Today > 2016 > 265 > C > 111-117

We investigated steam reforming of toluene as a model compound of aromatic hydrocarbons included in biomass tar over Co supported La_0.7Sr_0.3AlO_3−δ (LSAO), perovskite oxide. Ni-supported LSAO catalyst has shown high activity and coke resistance from the redox property of lattice oxygen in/on the LSAO support. Co is known as an active metal for this reaction, so Co/LSAO catalyst was investigated in...

artykuł

Low Temperature Catalytic Water Gas Shift in an Electric Field

Yasushi Sekine, Kodai Yamagishi, Yukako Nogami, Ryo Manabe, więcej

Catalysis Letters > 2016 > 146 > 8 > 1423-1428

Catalytic water gas shift for hydrogen production in the temperature range of 423–873 K, was examined imposing an electric field to the catalyst bed. Reaction trends were investigated based on thermodynamic equilibrium and chemical kinetic law. Pt/La–ZrO₂ was chosen as an active catalyst through our screening tests, and the effect of the electric field on the catalytic activity was investigated by...

artykuł

Dehydrogenation of Methylcyclohexane over Pt/TiO₂ Catalyst

Satoshi Nagatake, Takuma Higo, Shuhei Ogo, Yukihiro Sugiura, więcej

Catalysis Letters > 2016 > 146 > 1 > 54-60

Methylcyclohexane (MCH) is expected as a hydrogen carrier. Dehydrogenation of MCH was conducted over supported Pt catalysts at 623 K. Pt/TiO₂ showed high stability for dehydrogenation and good resistance for coke formation. The partial pressure dependence of MCH, toluene, and H₂ was investigated for Pt/TiO₂ and Pt/Al₂O₃ catalysts, which showed different tendencies for toluene partial pressure. The...

artykuł

One pot direct catalytic conversion of cellulose to C3 and C4 hydrocarbons using Pt/H-USY zeolite catalyst at low temperature

Shuhei Ogo, Taku Nishio, Hikaru Sekine, Ayumu Onda, więcej

Fuel Processing Technology > 2016 > 141 > Part 1 > 123-129

One-pot direct catalytic conversion of cellulose to light hydrocarbon at low temperature (443K) in the presence of Pt–zeolite catalysts and water was investigated. Results revealed that Pt supported on H⁺-form ultra stable Y-type (H-USY) zeolite catalyst (Pt/H-USY) enabled direct conversion of cellulose into C₃ and C₄ hydrocarbons without hydrogen and other expensive reagents. This production trend...

artykuł

Synthesis of stable anisotropic carbon particle aggregates covered by surface nano-graphitic sheets

Kei Mukawa, Naganobu Oyama, Hiroaki Ando, Takashi Sugiyama, więcej

Carbon > 2015 > 88 > Complete > 33-41

For this study, pyrolytic carbon particles were synthesized in a pyrolytic reactor in which a moderate electric field by DC power was generated between two electrodes at the center of the pyrolysis zone at 1573K. The resulting carbon particles, which were collected on the top of the electrode, were analyzed to assess their microstructure and nanostructure using TEM observation, Raman spectroscopy,...

artykuł

Steam reforming of ethanol over K promoted Co catalyst

Shuhei Ogo, Takuya Shimizu, Yusaku Nakazawa, Kei Mukawa, więcej

Applied Catalysis A: General > 2015 > 495 > C > 30-38

We investigated the catalytic activity of Co/K/α-Al₂O₃ with various potassium (K) loadings for ethanol steam reforming. The promotion effect of K loading and the role of K in Co/K/α-Al₂O₃ were investigated using TEM–EDX, H₂-TPR, XAFS, XPS, and IR measurements. Results show that loading of 1–2wt% K on Co/α-Al₂O₃ was effective for improving catalytic activity, selectivity to hydrogen and suppressing...

artykuł

Effect of catalyst structure on steam reforming of toluene over Ni/La0.7Sr0.3AlO3−δ catalyst

Kento Takise, Masaya Imori, Daiki Mukai, Shuhei Ogo, więcej

Applied Catalysis A: General > 2015 > 489 > C > 155-161

We investigated steam reforming of toluene as a biomass tar model on Ni/La_0.7Sr_0.3AlO_3−δ, which has high activity and low carbon deposition for hydrogen production. Carbon deposition was suppressed by the oxidation of surface carbon species with lattice oxygen on support. The effects of Ni particle size and support surface area on catalytic features were evaluated by varying the calcination temperature...

artykuł

Pd/K/Co-oxide catalyst for water gas shift

Eugene Kono, Sakurako Tamura, Keisuke Yamamuro, Shuhei Ogo, więcej

Applied Catalysis A: General > 2015 > 489 > C > 247-254

Various Co₃O₄ catalysts were investigated for the water gas shift (WGS) reaction for hydrogen production. Although the catalyst supporting only palladium (Pd/Co₃O₄) showed low catalytic activity and higher selectivity to methanation, Pd/K/Co₃O₄ catalyst, with loading of potassium exceeding 0.78wt%, showed high catalytic activity for the WGS reaction. Catalysts on which Pd and K exist closely showed...

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