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24 results on '"Nishida, Yoshihide"'

1. Denary High-Entropy Oxide Nanoparticles Synthesized by a Continuous Supercritical Hydrothermal Flow Process

Author

50741857, 90234244, Hanabata, Shota, Kusada, Kohei, Yamamoto, Tomokazu, Toriyama, Takaaki, Matsumura, Syo, Kawaguchi, Shogo, Kubota, Yoshiki, Nishida, Yoshihide, Haneda, Masaaki, Kitagawa, Hiroshi, 50741857, 90234244, Hanabata, Shota, Kusada, Kohei, Yamamoto, Tomokazu, Toriyama, Takaaki, Matsumura, Syo, Kawaguchi, Shogo, Kubota, Yoshiki, Nishida, Yoshihide, Haneda, Masaaki, and Kitagawa, Hiroshi

Abstract

High-entropy oxide nanoparticles (HEO NPs) have been intensively studied because of their attractive properties, such as high stability and enhanced catalytic activity. In this work, for the first time, denary HEO NPs were successfully synthesized using a continuous supercritical hydrothermal flow process without calcination. Interestingly, this process allows the formation of HEO NPs on the order of seconds at a relatively lower temperature. The synthesized HEO NPs contained 10 metal elements, La, Ca, Sr, Ba, Fe, Mn, Co, Ru, Pd, and Ir, and had a perovskite-type structure. Atomic-resolution high-angle annular dark-field scanning transmission electron microscopy and energy-dispersive X-ray spectroscopy measurements revealed homogeneous dispersion of the 10 metal elements. The obtained HEO NPs also exhibited a higher catalytic activity for the CO oxidation reaction than that of the LaFeO₃ NPs.

Published
2024

4. Discovering Linear Descriptors for Activation Energy and Direct Hydrocarbon Dissociations by Dual-Atom Sites in Immiscible PdxPt1–xSolid Solutions

Author

Tan, Zhe, Haneda, Masaaki, Nishida, Yoshihide, Zhang, Quan, Wu, Dongshuang, Cheng, Jun, Kitagawa, Hiroshi, and Huang, Bo

Abstract

In this study, homogeneously distributed PdxPt1–xdual-atom-site catalysts (DASC) were successfully synthesized over the whole composition range. In the three-way catalytic performance tests, Pd0.5Pt0.5and Pd0.9Pt0.1DASC exhibited greatly enhanced C3H6oxidation activities over those of pure Pd and Pt nanoparticles. During in situFourier transform infrared measurements, the direct C3H6dissociations on Pd–Pt dual-atom sites were discovered, which were mainly responsible for the superior C3H6oxidation activities of Pd0.5Pt0.5and Pd0.9Pt0.1DASC. In addition, a linear correlation between activity curves and Pt–CO wavenumbers was found, indicating that the IR wavenumber is a descriptor for activation energy.

Published
2024
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7. Nitrile hydrogenation to secondary amines under ambient conditions over palladium–platinum random alloy nanoparticles

Author

Nishida, Yoshihide, primary, Sato, Katsutoshi, additional, Chaudhari, Chandan, additional, Yamada, Hiroshi, additional, Toriyama, Takaaki, additional, Yamamoto, Tomokazu, additional, Matsumura, Syo, additional, Aspera, Susan Meñez, additional, Nakanishi, Hiroshi, additional, Haneda, Masaaki, additional, and Nagaoka, Katsutoshi, additional

Published
2022
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10. Chemoselective hydrogenation of heteroarenes and arenes by Pd–Ru–PVP under mild conditions

Author

Chaudhari, Chandan, primary, Sato, Katsutoshi, additional, Nishida, Yoshihide, additional, Yamamoto, Tomokazu, additional, Toriyama, Takaaki, additional, Matsumura, Syo, additional, Ikeda, Yasuyuki, additional, Terada, Kenji, additional, Abe, Naoya, additional, Kusuda, Kohei, additional, Kitagawa, Hiroshi, additional, and Nagaoka, Katsutoshi, additional

Published
2020
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12. Coreduction methodology for immiscible alloys of CuRu solid-solution nanoparticles with high thermal stability and versatile exhaust purification ability

Author

Huang, Bo, primary, Kobayashi, Hirokazu, additional, Yamamoto, Tomokazu, additional, Matsumura, Syo, additional, Nishida, Yoshihide, additional, Sato, Katsutoshi, additional, Nagaoka, Katsutoshi, additional, Haneda, Masaaki, additional, Kawaguchi, Shogo, additional, Kubota, Yoshiki, additional, and Kitagawa, Hiroshi, additional

Published
2020
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14. Frontispiece: A CO Adsorption Site Change Induced by Copper Substitution in a Ruthenium Catalyst for Enhanced CO Oxidation Activity

Author

Huang, Bo, primary, Kobayashi, Hirokazu, additional, Yamamoto, Tomokazu, additional, Toriyama, Takaaki, additional, Matsumura, Syo, additional, Nishida, Yoshihide, additional, Sato, Katsutoshi, additional, Nagaoka, Katsutoshi, additional, Haneda, Masaaki, additional, Xie, Wei, additional, Nanba, Yusuke, additional, Koyama, Michihisa, additional, Wang, Fenglong, additional, Kawaguchi, Shogo, additional, Kubota, Yoshiki, additional, and Kitagawa, Hiroshi, additional

Published
2019
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15. Rh-PVP Catalyzed Reductive Amination of Phenols by Ammonia or Amines to Cyclohexylamines under Solvent-free Conditions

Author

Chaudhari, Chandan, Sato, Katsutoshi, Rumi, Saeki, Nishida, Yoshihide, Shiraishi, Masaya, and Nagaoka, Katsutoshi

Abstract

Colloidal metal nanoparticles were examined for reductive amination of phenol by ammonia under mild reaction conditions. The results showed that Rh-PVP was the most active catalyst for reductive amination reaction. Linear, cyclic, and amino alcohols were used as nucleophiles and converted to primary/secondary/tertiary amines. Using this strategy, the synthesis of an industrially important chemical, N-cyclohexyl-2-pyrrolidone was explored.Colloidal metal nanoparticles were examined for reductive amination of phenol by ammonia under mild reaction conditions. The results showed that Rh-PVP catalyst was found be the most active for reductive amination reaction. Linear, cyclic, and amino alcohols were used as nucleophiles and converted to primary/secondary/tertiary amines. Using this strategy, the synthesis of an industrially important chemical, N-cyclohexyl-2-pyrrolidone was explored.

Published
2022
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16. A CO Adsorption Site Change Induced by Copper Substitution in a Ruthenium Catalyst for Enhanced CO Oxidation Activity

Author

Huang, Bo, primary, Kobayashi, Hirokazu, additional, Yamamoto, Tomokazu, additional, Toriyama, Takaaki, additional, Matsumura, Syo, additional, Nishida, Yoshihide, additional, Sato, Katsutoshi, additional, Nagaoka, Katsutoshi, additional, Haneda, Masaaki, additional, Xie, Wei, additional, Nanba, Yusuke, additional, Koyama, Michihisa, additional, Wang, Fenglong, additional, Kawaguchi, Shogo, additional, Kubota, Yoshiki, additional, and Kitagawa, Hiroshi, additional

Published
2018
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20. A CO Adsorption Site Change Induced by Copper Substitution in a Ruthenium Catalyst for Enhanced CO Oxidation Activity.

Author

Huang, Bo, Kobayashi, Hirokazu, Yamamoto, Tomokazu, Toriyama, Takaaki, Matsumura, Syo, Nishida, Yoshihide, Sato, Katsutoshi, Nagaoka, Katsutoshi, Haneda, Masaaki, Xie, Wei, Nanba, Yusuke, Koyama, Michihisa, Wang, Fenglong, Kawaguchi, Shogo, Kubota, Yoshiki, and Kitagawa, Hiroshi

Subjects
RUTHENIUM, ADSORPTION (Chemistry), CARBON monoxide, OXIDATION, ALLOYS
Abstract

Ru is an important catalyst in many types of reactions. Specifically, Ru is well known as the best monometallic catalyst for oxidation of carbon monoxide (CO) and has been practically used in residential fuel cell systems. However, Ru is a minor metal, and the supply risk often causes violent fluctuations in the price of Ru. Performance‐improved and cost‐reduced solid‐solution alloy nanoparticles of the Cu‐Ru system for CO oxidation are now presented. Over the whole composition range, all of the CuxRu1−x nanoparticles exhibit significantly enhanced CO oxidation activities, even at 70 at % of inexpensive Cu, compared to Ru nanoparticles. Only 5 at % replacement of Ru with Cu provided much better CO oxidation activity, and the maximum activity was achieved by 20 at % replacement of Ru by Cu. The origin of the high catalytic performance was found as CO site change by Cu substitution, which was investigated using in situ Fourier transform infrared spectra and theoretical calculations. Copper helps out: The weakening of the CO adsorption energy on Ru atoms by alloying with Cu atoms plays an important role in the enhancement of the CO oxidation activity of CuxRu1−x nanoparticles. The weakening of the CO adsorption energy on Ru atoms originating from the CO adsorption site change was confirmed by experimental and theoretical investigations. [ABSTRACT FROM AUTHOR]

Published
2019
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24. A CO Adsorption Site Change Induced by Copper Substitution in a Ruthenium Catalyst for Enhanced CO Oxidation Activity.

Author

Huang B, Kobayashi H, Yamamoto T, Toriyama T, Matsumura S, Nishida Y, Sato K, Nagaoka K, Haneda M, Xie W, Nanba Y, Koyama M, Wang F, Kawaguchi S, Kubota Y, and Kitagawa H

Abstract

Ru is an important catalyst in many types of reactions. Specifically, Ru is well known as the best monometallic catalyst for oxidation of carbon monoxide (CO) and has been practically used in residential fuel cell systems. However, Ru is a minor metal, and the supply risk often causes violent fluctuations in the price of Ru. Performance-improved and cost-reduced solid-solution alloy nanoparticles of the Cu-Ru system for CO oxidation are now presented. Over the whole composition range, all of the Cu x Ru 1-x nanoparticles exhibit significantly enhanced CO oxidation activities, even at 70 at % of inexpensive Cu, compared to Ru nanoparticles. Only 5 at % replacement of Ru with Cu provided much better CO oxidation activity, and the maximum activity was achieved by 20 at % replacement of Ru by Cu. The origin of the high catalytic performance was found as CO site change by Cu substitution, which was investigated using in situ Fourier transform infrared spectra and theoretical calculations., (© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)

Published
2019
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