研究者詳細 - 永岡　勝俊

論文 - 永岡　勝俊

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Influence of the Crystal Structure of Titanium Oxide on the Catalytic Activity of Rh/TiO2 in Steam Reforming of Propane at Low Temperature 査読有り

Yu Lin, Sato Katsutoshi, Toriyama Takaaki, Yamamoto Tomokazu, Matsumura Syo, Nagaoka Katsutoshi

CHEMISTRY-A EUROPEAN JOURNAL 24 巻 ( 35 ) 頁： 8742-8746 2018年6月

Efficient ammonia synthesis over a Ru/La0.5Ce0.5O1.75 catalyst pre-reduced at high temperature

Ogura Yuta, Sato Katsutoshi, Miyahara Shin-ichiro, Kawano Yukiko, Toriyama Takaaki, Yamamoto Tomokazu, Matsumura Syo, Hosokawa Saburo, Nagaoka Katsutoshi

CHEMICAL SCIENCE 9 巻 ( 8 ) 頁： 2230 - 2237 2018年2月

記述言語：日本語掲載種別：研究論文（学術雑誌）

© 2018 The Royal Society of Chemistry. Ammonia is an important feedstock for producing fertiliser and is also a potential energy carrier. However, the process currently used for ammonia synthesis, the Haber-Bosch process, consumes a huge amount of energy; therefore the development of new catalysts for synthesising ammonia at a high rate under mild conditions (low temperature and low pressure) is necessary. Here, we show that Ru/La0.5Ce0.5O1.75pre-reduced at an unusually high temperature (650 °C) catalysed ammonia synthesis at extremely high rates under mild conditions; specifically, at a reaction temperature of 350 °C, the rates were 13.4, 31.3, and 44.4 mmol g-1h-1at 0.1, 1.0, and 3.0 MPa, respectively. Kinetic analysis revealed that this catalyst is free of hydrogen poisoning under the conditions tested. Electron energy loss spectroscopy combined with O2absorption capacity measurements revealed that the reduced catalyst consisted of fine Ru particles (mean diameter < 2.0 nm) that were partially covered with partially reduced La0.5Ce0.5O1.75and were dispersed on a thermostable support. Furthermore, Fourier transform infrared spectra measured after N2addition to the catalyst revealed that N2adsorption on Ru atoms that interacted directly with the reduced La0.5Ce0.5O1.75weakened the NN bond and thus promoted its cleavage, which is the rate-determining step for ammonia synthesis. Our results indicate that high-temperature pre-reduction of this catalyst, which consists of Ru supported on a thermostable composite oxide with a cubic fluorite structure and containing reducible cerium, resulted in the formation of many sites that were highly active for N2reduction by hydrogen.

DOI： 10.1039/c7sc05343f

Facile Synthesis of Size-controlled Rh Nanoparticles via Microwave-assisted Alcohol Reduction and Their Catalysis of CO Oxidation

Nishida Yoshihide, Sato Katsutoshi, Yamamoto Tomokazu, Wu Dongshuang, Kusada Kohei, Kobayashi Hirokazu, Matsumura Syo, Kitagawa Hiroshi, Nagaoka Katsutoshi

CHEMISTRY LETTERS 46 巻 ( 8 ) 頁： 1254 - 1257 2017年8月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人日本化学会

<p>Size-controlled Rh nanoparticles stabilized by poly(vinylpyrrolidone) were quickly synthesized via alcohol reduction. Microwave-assisted synthesis in closed vessels allowed alcohols with low-to-high boiling points to be used as reductants under the same preparation conditions. Pure ethanol has not been used previously because its boiling point is lower than the temperature required for Rh<sup>3+</sup> reduction. Alcohols with relatively strong reduction ability were found to lead to smaller Rh nanoparticles. The ability to oxidize CO was enhanced as the Rh particle size decreased.</p>

DOI： 10.1246/cl.170440

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Solid-Solution Alloying of Immiscible Ru and Cu with Enhanced CO Oxidation Activity 査読有り

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

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 139 巻 ( 13 ) 頁： 4643 - 4646 2017年4月

Carbon-free H-2 production from ammonia triggered at room temperature with an acidic RuO2/gamma-Al2O3 catalyst 査読有り

Nagaoka Katsutoshi, Eboshi Takaaki, Takeishi Yuma, Tasaki Ryo, Honda Kyoko, Imamura Kazuya, Sato Katsutoshi

SCIENCE ADVANCES 3 巻 ( 4 ) 頁： e1602747 2017年4月

Supported Ni catalysts prepared from hydrotalcite-like compounds for the production of hydrogen by ammonia decomposition 査読有り

Sato Katsutoshi, Abe Naruhiko, Kawagoe Takafumi, Miyahara Shin-ichiro, Honda Kyoko, Nagaoka Katsutoshi

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 42 巻 ( 10 ) 頁： 6610 - 6617 2017年3月

Electronic Structure Evolution with Composition Alteration of RhxCuy Alloy Nanoparticles

Palina Natalia, Sakata Osami, Kumara L. S. R., Song Chulho, Sato Katsutoshi, Nagaoka Katsutoshi, Komatsu Tokutaro, Kobayashi Hirokazu, Kusada Kohei, Kitagawa Hiroshi

SCIENTIFIC REPORTS 7 巻 ( 7 ) 頁： 41264 2017年1月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：Springer Nature

組成が違っても触媒活性が同等な新規Rh-Cuナノ粒子の電子状態の観測 : 合金の複合的な電子状態が寄与することを示唆. 京都大学プレスリリース. 2017-01-30.

DOI： 10.1038/srep41264

A low-crystalline ruthenium nano-layer supported on praseodymium oxide as an active catalyst for ammonia synthesis 査読有り

Sato Katsutoshi, Imamura Kazuya, Kawano Yukiko, Miyahara Shin-ichiro, Yamamoto Tomokazu, Matsumura Syo, Nagaoka Katsutoshi

CHEMICAL SCIENCE 8 巻 ( 1 ) 頁： 674 - 679 2017年1月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：Royal Society of Chemistry (RSC)

Ammonia is a crucial chemical feedstock for fertilizer production and is a potential energy carrier. However, the current method of synthesizing ammonia, the Haber–Bosch process, consumes a great deal of energy. To reduce energy consumption, a process and a substance that can catalyze ammonia synthesis under mild conditions (low temperature and low pressure) are strongly needed. Here we show that Ru/Pr2O3 without any dopant catalyzes ammonia synthesis under mild conditions at 1.8 times the rates reported with other highly active catalysts. Scanning transmission electron micrograph observations and energy dispersive X-ray analyses revealed the formation of low-crystalline nano-layers of ruthenium on the surface of Pr2O3. Furthermore, CO2 temperature-programmed desorption revealed that the catalyst was strongly basic. These unique structural and electronic characteristics are considered to synergistically accelerate the rate-determining step of NH3 synthesis, cleavage of the N[triple bond, length as m-dash]N bond. We expect that the use of this catalyst will be a starting point for achieving efficient ammonia synthesis.

DOI： 10.1039/c6sc02382g

その他リンク： http://orcid.org/0000-0003-1774-1537

First-Principles Calculation, Synthesis, and Catalytic Properties of Rh-Cu Alloy Nanoparticles 査読有り

Komatsu Tokutaro, Kobayashi Hirokazu, Kusada Kohei, Kubota Yoshiki, Takata Masaki, Yamamoto Tomokazu, Matsumura Syo, Sato Katsutoshi, Nagaoka Katsutoshi, Kitagawa Hiroshi

CHEMISTRY-A EUROPEAN JOURNAL 23 巻 ( 1 ) 頁： 57 - 60 2017年1月

Catalyst using Pd-Ru solid solution alloy fine particles 査読有り

Kitagawa Hiroshi, Kusada Kohei, Nagaoka Katsutoshi, Sato Katsutoshi, Kutubi M, Shahajahan

2016年9月

A Synthetic Pseudo-Rh: NOx Reduction Activity and Electronic Structure of Pd-Ru Solid-solution Alloy Nanoparticles 査読有り

Sato Katsutoshi, Tomonaga Hiroyuki, Yamamoto Tomokazu, Matsumura Syo, Zulkifli Nor Diana Binti, Ishimoto Takayoshi, Koyama Michihisa, Kusada Kohei, Kobayashi Hirokazu, Kitagawa Hiroshi, Nagaoka Katsutoshi

SCIENTIFIC REPORTS 6 巻 ( 6 ) 頁： 28265 2016年6月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：Nature Publishing Group

ロジウムを凌駕する排ガス浄化触媒活性を有する新規合金ナノ粒子－元素間融合により電子状態を改変、優れたNOx還元活性の発現－. 京都大学プレスリリース. 2016-06-27.

DOI： 10.1038/srep28265

その他リンク： http://orcid.org/0000-0003-1774-1537

Dual Lewis Acidic/Basic Pd0.5Ru0.5-Poly(N-vinyl-2-pyrrolidone) Alloyed Nanoparticle: Outstanding Catalytic Activity and Selectivity in Suzuki-Miyaura Cross-Coupling Reaction 査読有り

Kutubi Md. Shahajahan, Sato Katsutoshi, Wada Kenji, Yamamoto Tomokazu, Matsumura Syo, Kusada Kohei, Kobayashi Hirokazu, Kitagawa Hiroshi, Nagaoka Katsutoshi

CHEMCATCHEM 7 巻 ( 23 ) 頁： 3887 - 3894 2015年12月

Development of Efficient Cold-start Process for Oxidative Reforming of n-Butane for Fuel Cell Applications 査読有り

Nagaoka Katsutoshi, Sato Katsutoshi

JOURNAL OF THE JAPAN PETROLEUM INSTITUTE 58 巻 ( 5 ) 頁： 274 - 284 2015年9月

Influence of basic dopants on the activity of Ru/Pr6O11 for hydrogen production by ammonia decomposition 査読有り

Nagaoka Katsutoshi, Eboshi Takaaki, Abe Naruhiko, Miyahara Shin-ichiro, Honda Kyoko, Sato Katsutoshi

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 39 巻 ( 35 ) 頁： 20731 - 20735 2014年12月

Inhibition of Ammonia Poisoning by Addition of Platinum to Ru/alpha-Al2O3 for Preferential CO Oxidation in Fuel Cells 査読有り

Sato Katsutoshi, Yagi Sho, Zaitsu Shuhei, Kitayama Godai, Kayada Yuto, Teramura Kentaro, Takita Yusaku, Nagaoka Katsutoshi

CHEMSUSCHEM 7 巻 ( 12 ) 頁： 3264 - 3267 2014年12月

Synthesis and catalytic application of PVP-coated Ru nanoparticles embedded in a porous metal-organic framework 査読有り

Sadakiyo Masaaki, Kon-no Masaru, Sato Katsutoshi, Nagaoka Katsutoshi, Kasai Hidetaka, Kato Kenichi, Yamauchi Miho

DALTON TRANSACTIONS 43 巻 ( 29 ) 頁： 11295 - 11298 2014年8月

Effect of the Nature of the CeO2 Support of the Rh Catalyst on Triggering the Oxidative Reforming of n-Butane for H2 Production from Ambient Temperature 査読有り

Sato Katsutoshi, Adachi Kouhei, Takita Yusaku, Nagaoka Katsutoshi

CHEMCATCHEM 6 巻 ( 3 ) 頁： 784 - 789 2014年3月

Solid Solution Alloy Nanoparticles of Immiscible Pd and Ru Elements Neighboring on Rh: Changeover of the Thermodynamic Behavior for Hydrogen Storage and Enhanced CO-Oxidizing Ability 査読有り

Kusada Kohei, Kobayashi Hirokazu, Ikeda Ryuichi, Kubota Yoshiki, Takata Masaki, Toh Shoichi, Yamamoto Tomokazu, Matsumura Syo, Sumi Naoya, Sato Katsutoshi, Nagaoka Katsutoshi, Kitagawa Hiroshi

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 136 巻 ( 5 ) 頁： 1864 - 1871 2014年2月

Cr3+-Co0.054Ni0.018Mg0.93O Solid-Solution Catalysts for High-Pressure Syngas Production: Effect of Chromium on the Reduction and Catalysis 査読有り

Nagaoka Katsutoshi, Abe Yosuke, Hashimoto Yusaku, Ishikawa Takahiro, Sato Katsutoshi, Takita Yusaku, Wakatsuki Toshiya, Kunisu Masahiro, Suda En, Inamoto Shin

ACS CATALYSIS 3 巻 ( 7 ) 頁： 1564 - 1572 2013年7月

Discovery of Face-Centered-Cubic Ruthenium Nanoparticles: Facile Size-Controlled Synthesis Using the Chemical Reduction Method 査読有り

Kusada Kohei, Kobayashi Hirokazu, Yamamoto Tomokazu, Matsumura Syo, Naoya Sumi, Sato Katsutoshi, Nagaoka Katsutoshi, Kubota Yoshiki, Kitagawa Hiroshi

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 135 巻 ( 15 ) 頁： 5493 - 5496 2013年4月

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