Faculty Profiles - NAGAOKA Katsutoshi

Papers - NAGAOKA Katsutoshi

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Nonequilibrium Flow-Synthesis of Solid-Solution Alloy Nanoparticles: From Immiscible Binary to High-Entropy Alloys Reviewed

Kohei Kusada, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Katsutoshi Sato, Katsutoshi Nagaoka, Kenji Terada, Yasuyuki Ikeda, Yoshinari Hirai, Hiroshi Kitagawa

Journal of Physical Chemistry C Vol. 125 ( 1 ) page： 458 - 463 2021.1

Language：English Publishing type：Research paper (scientific journal)

Solid-solution alloy nanoparticles (NPs), where the constituents mix at the atomic level, show a variety of attractive properties due to their tunable electronic structures. However, it is still difficult to stably synthesize them, particularly nonequilibrium alloys that consist of combinations immiscible in the bulk. Here, we first report the successful syntheses of solid-solution alloy NPs including PdRu and PdRuIr, which are immiscible in the bulk, and of IrPdPtRhRu high-entropy alloy NPs through a continuous-flow reactor providing a high productivity with high reproducibility. The designed solvothermal flow reactor enabled us to use a lower alcohol as a reductant that cannot be applied in a batch synthesis for these NPs.

DOI： 10.1021/acs.jpcc.0c08871

Chemoselective hydrogenation of heteroarenes and arenes by Pd-Ru-PVP under mild conditions Reviewed Open Access

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

RSC Advances Vol. 10 ( 72 ) page： 44191 - 44195 2020.12

Language：English Publishing type：Research paper (scientific journal)

Monometallic (Pd, Ru or Rh) and bimetallic (Pd0.5-Ru0.5) alloy NPs catalysts were examined for the hydrogenation of quinoline. Pd-Ru alloy catalyst showed superior catalytic activity to the traditional Rh catalyst. The characterization of Pd0.5-Ru0.5 catalysts, HAADF-EDX mapping and XPS analysis suggested that the alloy state of PdRu catalysts remained unchanged in the recovered catalyst. Furthermore, the catalyst was highly selective for the hydrogenation of different arenes. This journal is

DOI： 10.1039/d0ra09981c

One-pot synthesis of pyrrolidones from levulinic acid and amines/nitroarenes/nitriles over the Ir-PVP catalyst Reviewed

Chandan Chaudhari, Masaya Shiraishi, Yoshihide Nishida, Katsutoshi Sato, Katsutoshi Nagaoka

Green Chemistry Vol. 22 ( 22 ) page： 7760 - 7764 2020.11

Language：English Publishing type：Research paper (scientific journal)

The synthesis of pyrrolidones via reductive amination of levulinic acid with aniline was examined over polypyrrolidone-stabilized metal nanoparticle catalysts. Among them, Ir metal was the most effective and applicable for the reductive amination of levulinic acid with nitroarenes/nitriles. Importantly, this catalyst was used for the one-pot synthesis of the anti-inflammatory drug indoprofen from 2-formylbenzoic acid and 2-(4-nitrophenyl)propanoic acid.

DOI： 10.1039/d0gc01725f

Coreduction methodology for immiscible alloys of CuRu solid-solution nanoparticles with high thermal stability and versatile exhaust purification ability Reviewed Open Access

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

Chemical Science Vol. 11 ( 42 ) page： 11413 - 11418 2020.11

Language：English Publishing type：Research paper (scientific journal)

This study provides a coreduction methodology for solid solution formation in immiscible systems, with an example of a whole-region immiscible Cu-Ru system. Although the binary Cu-Ru alloy system is very unstable in the bulk state, the atomic-level well-mixed CuRu solid solution nanoparticles were found to have high thermal stability up to at least 773 K in a vacuum. The exhaust purification activity of the CuRu solid solution was comparable to that of face-centred cubic Ru nanoparticles. According to in situ infrared measurements, stronger NO adsorption and higher intrinsic reactivity of the Ru site on the CuRu surface than that of a pure Ru surface were found, affected by atomic-level Cu substitution. Furthermore, CuRu solid solution was a versatile catalyst for purification of all exhaust gases at a stoichiometric oxygen concentration. This journal is

DOI： 10.1039/d0sc03373a

Oxidation of Ru/Ce<inf>0.5</inf>Zr<inf>0.5</inf>O<inf>2- x</inf>at Ambient Temperature as a Trigger for Carbon-Free H<inf>2</inf>Production by Ammonia Oxidative Decomposition Reviewed

Takahiro Matsunaga, Suguru Matsumoto, Ryo Tasaki, Yuta Ogura, Takaaki Eboshi, Yuma Takeishi, Kyoko Honda, Katsutoshi Sato, Katsutoshi Nagaoka

ACS Sustainable Chemistry and Engineering Vol. 8 ( 35 ) page： 13369 - 13376 2020.9

Language：English Publishing type：Research paper (scientific journal)

Ammonia has received attention as a hydrogen carrier for energy use, and although ammonia decomposition can produce hydrogen at a high rate, there is currently no simple process for decomposing ammonia that is easily and rapidly initiated at any time without an input of external energy. Here, we report the discovery of a process for initiating and sustaining the production of hydrogen from ammonia without heating the catalyst externally. The oxidative decomposition of ammonia to produce hydrogen at a high rate was repeatedly triggered at ambient temperature (∼25 °C) immediately after NH3 and O2 were supplied to a Ru/Ce0.5Zr0.5O2 catalyst that had been previously reduced at ambient temperature. For this catalyst, active hydrogen atoms formed on Ru0 nanoparticles reduced Ce0.5Zr0.5O2 even at ambient temperature, and the very exothermic oxidation of Ce0.5Zr0.5O2-x as well as Ru0 heated the catalyst bed to the catalytic auto-ignition temperature for ammonia combustion, which was lowered by the contribution of mobile (active) oxygen over the Ce0.5Zr0.5O2. Oxidative ammonia decomposition was thereby triggered.

DOI： 10.1021/acssuschemeng.0c04126

Effect of Calcination and Reduction Temperatures on the Catalytic Activity of Ru/La<inf>0.5</inf>Ce<inf>0.5</inf>O<inf>1.75</inf> for Ammonia Synthesis under Mild Conditions Reviewed Open Access

Yuta Ogura, Takahiro Asai, Katsutoshi Sato, Shin ichiro Miyahara, Takaaki Toriyama, Tomokazu Yamamoto, Syo Matsumura, Katsutoshi Nagaoka

Energy Technology Vol. 8 ( 6 ) page： 2000264 2020.6

Language：English Publishing type：Research paper (scientific journal)

© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Ammonia is a potential carrier of hydrogen as a zero-emission fuel. Herein, the effects of calcination and reduction temperatures on the ammonia-synthesis activity of Ru/La0.5Ce0.5O1.75 are investigated under mild synthesis conditions (≤400 °C, ≤3 MPa), which are the preferred conditions for the storage of hydrogen as an energy source. The highest catalytic activity is obtained after calcination of the support at 700 °C and reduction of the catalyst at 650 °C. Calcination using a higher temperature than that used for reduction results in the induction of a strong metal–support interaction (SMSI) effect. This high-temperature calcination also provides heat resistance to the support, which prevents sintering of the primary support particles during reduction. Thus, calcination and reduction at temperatures higher than those normally used for the preparation of Ru catalysts provide a novel approach for obtaining supported highly dispersed Ru catalysts exhibiting the SMSI effect and high catalytic activities.

DOI： 10.1002/ente.202000264

Pr<inf>2</inf>O<inf>3</inf> Supported Nano-layered Ruthenium Catalyzed Acceptorless Dehydrogenative Synthesis of 2-Substituted Quinolines and 1,8-Naphthyridines from 2-Aminoaryl Alcohols and Ketones Reviewed Open Access

Chandan Chaudhari, Katsutoshi Sato, Yuta Ogura, Shin Ichiro Miayahara, Katsutoshi Nagaoka

ChemCatChem Vol. 12 ( 8 ) page： 2198 - 2202 2020.4

Language：English Publishing type：Research paper (scientific journal)

Pr2O3 supported Ru nanolayers and Ru nanoparticles catalysts were examined for the synthesis of quinolines. The Ru nanolayer was most active catalyst and showed a broad substrate scope. Structure-activity relationship demonstrated that the metallic state and morphology of Ru as well as the basic site of Pr2O3 were indispensable factors of this catalytic system.

DOI： 10.1002/cctc.201902311

Surface dynamics for creating highly active ru sites for ammonia synthesis: Accumulation of a low-crystalline, oxygen-deficient nanofraction Reviewed

Katsutoshi Sato, Shin ichiro Miyahara, Yuta Ogura, Kotoko Tsujimaru, Yuichiro Wada, Takaaki Toriyama, Tomokazu Yamamoto, Syo Matsumura, Katsutoshi Nagaoka

ACS Sustainable Chemistry and Engineering Vol. 8 ( 7 ) page： 2726 - 2734 2020.2

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER CHEMICAL SOC

© 2020 American Chemical Society. To mitigate global problems related to energy and global warming, it is helpful to develop an ammonia synthesis process using catalysts that are highly active under mild conditions. Here we show that the ammonia synthesis activity per weight of catalyst of Ru/Ba/LaCeOx, prereduced at 700 °C, is the highest among reported oxide-supported Ru catalysts, 52.3 mmol h-1 gcat-1 at 350 °C, 1.0 MPa. The turnover frequency of Ru/Ba/LaCeOx at 350 °C was more than 8 times that of Cs+/Ru/MgO, which is a well-known active catalyst used as a benchmark; furthermore, hydrogen poisoning, a typical drawback for oxide-supported Ru catalysts, was effectively suppressed. Scanning transmission electron microscopy observations with energy dispersive X-ray spectrometry and electron energy loss spectroscopy analysis revealed that a low-crystalline, oxygen-deficient nanofraction including Ba2+, Ce3+, and La3+ had accumulated on the Ru particles. This unique structure was obtained by exploiting the surface dynamics of alkaline earth compounds and thermostable rare earth oxides that contain redox-active atoms during the reduction at an unusually high temperature. The nanofraction showed strong electron-donating ability because of the strong basicity of the included cations, removal of carbonate, and formation of oxygen defect sites that eliminated electron-withdrawing O2- anions from the interface between the nanofraction and Ru atom. Electrons were therefore effectively donated to antibonding π -orbitals of the N2 molecules via Ru in contact with the nanofraction, and NN triple bond cleavage, which is the rate-determining step for ammonia synthesis, was promoted.

DOI： 10.1021/acssuschemeng.9b06299

Kinetics of ammonia synthesis over Ru/Pr2O3 Reviewed

Kazuya Imamura, Shin-ichiro Miyahara, Yukiko Kawano, Katsutoshi Sato, Yuta Nakasaka, Katsutoshi Nagaoka

Journal of the Taiwan Institute of Chemical Engineers Vol. 105 page： 50 - 56 2019.12

Language：English Publishing type：Research paper (scientific journal)

We investigated the kinetics of NH3 synthesis over a catalyst consisting of low-crystalline Ru nano-layers supported on Pr2O3. We determined the reaction orders with respect to N2, H2, and NH3 at various temperatures and pressures over Ru/Pr2O3, as well as Ru/CeO2 and Ru/MgO. The reaction orders with respect to N2 were always almost unity for all the catalysts under all the reaction conditions, indicating that the rate-determining step was NN bond cleavage. In contrast, the reaction orders with respect to H2 differed among the catalysts and decreased with increasing pressure and increased with increasing temperature. Under all conditions, the reaction order with respect to H2 was largest over Ru/Pr2O3 and smallest over Ru/MgO, indicating that hydrogen poisoning of the Ru surface was retarded to a greater extent over Ru/Pr2O3 than over Ru/MgO. In agreement with the trends of the H2 reaction orders, the NH3 synthesis rates over Ru/Pr2O3 at 400 °C rose drastically (64 mmol h−1 g−1) as the pressure was increased from 0.1 to 3.0 MPa. Furthermore, decreasing the feed gas H2/N2 ratio at 3.0 MPa effectively increased the NH3 synthesis rate over Ru/Pr2O3, which reached 45 mmol h−1 g−1 at 350 °C at a H2/N2 ratio of 1/0.5.<br />

DOI： 10.1016/j.jtice.2019.10.006

Recyclable Rh-PVP nanoparticles catalyzed hydrogenation of benzoic acid derivatives and quinolines under solvent-free conditions Reviewed

Chandan Chaudhari, Hirotaka Imatome, Yoshihide Nishida, Katsutoshi Sato, Katsutoshi Nagaoka

Catalysis Communications Vol. 126 page： 55 - 60 2019.6

Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier BV

Various transition metal nanoparticles, prepared by microwave-assisted alcohol reduction method were examined for hydrogenation of benzoic acid to cyclohexanecarboxylic acid under solvent-free conditions. Rh metal was the most effective catalyst over other metal catalyst. The catalyst showed moderate to high yield for the hydrogenation of substituted benzoic acid and substituted quinolines. Rh-PVP was recycled four times with a minor loss in catalytic activity.

DOI： 10.1016/j.catcom.2019.02.019

Pt-Co Alloy Nanoparticles on γ-Al <inf>2</inf> O <inf>3</inf> Support: Synergistic Effect between Isolated Erectron-rich Pt and Co for Purification of Automotive Exhaust Reviewed

Sato K, Ito A, Tomonaga H, Kanematsu H, Wada Y, Asakura H, Hosokawa S, Tanaka T, Toriyama T, Yamamoto T, Matsumura S, Nagaoka K

ChemPlusChem Vol. 84 ( 5 ) page： 447 - 456 2019.5

Language：English Publishing type：Research paper (scientific journal) Publisher：WILEY-V C H VERLAG GMBH

© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim There is interest in minimizing or eliminating the use of Pt in catalysts by replacing it with more widely abundant and cost-effective elements. The alloying of Pt with non-noble metals is a potential strategy for reducing Pt use because interactions between Pt and non-noble metals can modify the catalyst structure and electronic properties. Here, a γ-Al2O3-supported bimetallic catalyst [Pt(0.1)Co(1)/Al2O3] was prepared which contained 0.1 wt % Pt and 1 wt % Co and thus featured an extremely low Pt : Co ratio (<1 : 30 mol/mol). The Pt and Co in this catalyst formed alloy nanoparticles in which isolated electron-rich Pt atoms were present on the nanoparticle surface. The activity of this Pt(0.1)Co(1)/Al2O3 catalyst for the purification of automotive exhaust was comparable to the activities of 0.3 and 0.5 wt % Pt/γ-Al2O3 catalysts. Electron-rich Pt and metallic Co promoted activation of NOx and oxidization of CO and hydrocarbons, respectively. This strategy of tuning the surrounding structure and electronic state of a noble metal by alloying it with an excess of a non-noble metal will enable reduced noble metal use in catalysts for exhaust purification and other environmentally important reactions.

DOI： 10.1002/cplu.201800542

Other Link： http://orcid.org/0000-0002-3998-7012

Rh/Ce 0.25 Zr 0.75 O 2 Catalyst for Steam Reforming of Propane at Low Temperature Reviewed

Lin Yu, Katsutoshi Sato, Katsutoshi Nagaoka

ChemCatChem Vol. 11 ( 5 ) page： 1472 - 1479 2019.3

Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

Solid oxide fuel cells (SOFCs) show high energy-conversion efficiency and thus emit less CO2 than conventional combustion engines. Although SOFCs can directly convert hydrocarbons such as liquefied petroleum gas, these fuels readily induce coking on the electrodes of fuel cell stacks. To avoid coking, hydrocarbons can be subjected to a preliminary endothermic steam-reforming step at a relatively low temperature using waste heat from the stack. Herein, we report that a Rh/Ce0.25Zr0.75O2 catalyst exhibited higher propane-steam-reforming activity than other Rh/Ce1-xZrxO2 catalysts and Rh/gamma-Al2O3. Catalyst characterization revealed that Rh/Ce0.25Zr0.75O2 had excellent redox property and high H2O-adsorption activity, which contributed to the activation of steam and thus enhanced the propane-steam-reforming activity of this catalyst.

DOI： 10.1002/cctc.201801824

Electron Donation by Low-Crystalline Ba-La-Ce Oxygen-Deficient Composite Oxide Accumulating on Ru Nanoparticles for Ammonia Synthesis under Mild Conditions Reviewed

Katsutoshi Sato, Shin-ichiro Miyahara, Yuta Ogura, Kotoko Tsujimaru, Yuichiro Wada, Takaaki Toriyama, Tomokazu Yamamoto, Syo Matsumura, Katsutoshi Nagaoka

2019.2

A CO Adsorption Site Change Induced by Copper Substitution in a Ruthenium Catalyst for Enhanced CO Oxidation Activity. Reviewed International journal

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

Angewandte Chemie (International ed. in English) Vol. 58 ( 8 ) page： 2230 - 2235 2019.2

Language：English Publishing type：Research paper (scientific journal)

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 Cux Ru1-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.

DOI： 10.1002/anie.201812325

Preparation of Noble-metal Nanoparticles by Microwave-assisted Chemical Reduction and Evaluation as Catalysts for Nitrile Hydrogenation under Ambient Conditions

Yoshihide NISHIDA, Yuichiro WADA, Chandan CHAUDHARI, Katsutoshi SATO, Katsutoshi NAGAOKA

Journal of the Japan Petroleum Institute Vol. 62 ( 5 ) page： 220 - 227 2019

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Petroleum Institute

<p>Herein, we report a protocol for rapid preparation of uniformly sized Ru, Rh, Pd, Ir, and Pt nanoparticles stabilized by poly(<i>N</i>-vinyl-2-pyrrolidone) via microwave-assisted chemical reduction with ethanol. Although the boiling point of ethanol, which has high reduction ability, is much lower than the temperature required for metal cation reduction, this solvent could be used as a reductant because the preparation was carried out in a sealed vessel. All metal nanoparticles showed similar sizes and amounts of poly(<i>N</i>-vinyl-2-pyrrolidone). The crystallite size of the Pd and Pt nanoparticles could be controlled by changing the ethanol concentration. The catalytic performance of the prepared metal nanoparticles was evaluated for the hydrogenation of benzonitrile under ambient conditions (25 °C, 1 bar H<sub>2</sub>). Rh nanoparticles showed the highest benzonitrile conversion and highest selectivity for secondary imine product. Interestingly, the particle-size dependence of the catalytic activity of the Rh nanoparticles showed volcano-type behavior; that is, the second smallest Rh nanoparticles (3.3 nm) showed the highest activity, which was attributed to high metal surface area and high turnover frequency. Notably, this is the first report of nitrile hydrogenation to afford a secondary imine under ambient conditions.</p>

DOI： 10.1627/jpi.62.220

Analysis for Local Structure of Rh Nanoparticles Prepared via Microwave-assisted Liquid Phase Reduction Reviewed

Nishida Yoshihide, Wada Yuichiro, Sato Katsutoshi, Nagaoka Katsutoshi

Journal of the Japan Society of Electromagnetic Wave Energy Applications Vol. 3 ( 0 ) page： 1 - 5 2019

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Electromagnetic Wave Energy Applications

Rh nanoparticle catalysts were prepared via liquid phase reduction assisted by microwave-heating. Different kinds of alcohols as reductant including Rh precursor and stabilizer (Polyvinylpyrrolidone) were equally and quickly heated by microwave-heating. Conventional liquid phase reduction using electric heater requires long-heating time (2-3 h) . However,microwave-heating leads to formation of uniform Rh nanoparticles within 15 min. In EXAFS analyses, local structure of prepared Rh nanoparticles was identical to that of pure Rh powder, indicating that Rh atoms were reduced to metallic state.Coordination number (Rh-Rh) decreased from 12.5±1.1 to 9.4±0.7 when Rh particle size determined by TEM decreased from 6.7 nm to 3.3 nm. It was revealed that smaller Rh nanoparticles which have low coordination number (i.e., many dangling bond)show higher catalytic activity in CO oxidation reaction

DOI： 10.32304/jemeajournal.3.0_1

Ru/La0.5Pr0.5O1.75 Catalyst for Low-Temperature Ammonia Synthesis Reviewed

Yuta Ogura, Kotoko Tsujimaru, Katsutoshi Sato, Shin-ichiro Miyahara, Takaaki Toriyama, Tomokazu Yamamoto, Syo Matsumura, Katsutoshi Nagaoka

ACS Sustainable Chemistry & Engineering Vol. 6 ( 12 ) page： 17258 - 17266 2018.12

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：American Chemical Society ({ACS})

© 2018 American Chemical Society. To exploit the use of hydrogen as a source of sustainable energy, development of an efficient process for synthesizing an energy carrier such as ammonia under mild conditions will be necessary. Here, we show that Ru/La0.5Pr0.5O1.75 prereduced at an extraordinary high temperature of 650 °C catalyzes high NH3-synthesis rates under mild conditions. At 400 °C under 1.0 MPa, the synthesis rate was comparable with that of most active oxide-supported Ru catalysts. Kinetic analysis revealed that hydrogen poisoning, which is a typical drawback for oxide-supported Ru catalysts such as Cs+/Ru/MgO, was effectively suppressed over Ru/La0.5Pr0.5O1.75. The high activity induced by high-temperature reduction was attributable to the good thermal stability of the support and a phase change of the La0.5Pr0.5O1.75 support during prereduction. Fourier transform-infrared spectroscopy measurements after N2 adsorption on the catalyst revealed that electrons were efficiently donated from trigonal La0.5Pr0.5O1.5 to the antibonding π orbital of the N≡N bond of N2 via Ru atoms. Cleavage of the N≡N bond, the rate-determining step for ammonia synthesis, was thus accelerated. Our results expand the range of possibilities for developing more effective ammonia synthesis catalysts under mild conditions. Such catalysts will be needed to enable development of hydrogen-based sustainable energy resources.

DOI： 10.1021/acssuschemeng.8b04683

Combined theoretical and experimental studies of CO oxidation on PdRu nanoalloys Reviewed

Nor Diana Bt. Zulkifli, Takayoshi Ishimoto, Katsutoshi Sato, Takaaki Eboshi, Katsutoshi Nagaoka, Michihisa Koyama

APPLIED CATALYSIS A-GENERAL Vol. 568 page： 176 - 182 2018.11

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

The oxidation of carbon monoxide (CO) over PdRu solid solution nanoparticles was studied by the combined theoretical and experimental approaches. In this work, CO and O adsorptions on PdRu alloy surface models were theoretically investigated to understand the kinetics of CO oxidation reaction. It was found that CO adsorption on Pd atom in the PdRu alloy surfaces is weaker than on monometallic surfaces. From the experiment, reaction order of CO on the PdRu surface was observed to be smaller than that on Pd surface. While, the positive first order with respect to O-2 obtained for both Pd and PdRu alloy surfaces. Catalytic reaction mechanism is discussed on the basis of both theoretical and experimental observations.

DOI： 10.1016/j.apcata.2018.10.002

Photocatalytic chemoselective cleavage of C-O bonds under hydrogen gas- and acid-free conditions

Imamura, Kazuya, Kato, Hiroko, Wada, Yuichiro, Makabe, Kazuhiro, Onda, Ayumu, Tanaka, Atsuhiro, Kominami, Hiroshi, Sato, Katsutoshi, Nagaoka, Katsutoshi

CHEMICAL COMMUNICATIONS Vol. 54 ( 53 ) page： 7298 - 7301 2018.7

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：ROYAL SOC CHEMISTRY

In the presence of a palladium-loaded TiO2 photocatalyst, the cleavage of benzyl phenyl ether in low-molecular-weight alcohol solvents under de-aerated conditions afforded toluene and phenol simultaneously in a 1:1 molar ratio.

DOI： 10.1039/c8cc03362e

Selective hydrogenation of nitriles to secondary imines over Rh-PVP catalyst under mild conditions

Yoshihide Nishida, Chandan Chaudhari, Hirotaka Imatome, Katsutoshi Sato, Katsutoshi Sato, Katsutoshi Nagaoka

Chemistry Letters Vol. 47 ( 7 ) page： 938 - 940 2018.7

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Chemical Society of Japan

© 2018 The Chemical Society of Japan. Various metal nanoparticle catalysts (Ru, Rh, Pd, Ir, and Pt) were prepared via liquid-phase reduction and their activity was studied for selective hydrogenation of benzonitrile to corresponding secondary imine under mild conditions (3bar H2and 30°C). The Rh catalyst with particle size of 2.7 nm exhibited excellent activity for the hydrogenation of benzonitrile to secondary imine. The catalyst was reused and applied to transform various nitriles to corresponding secondary imines.

DOI： 10.1246/cl.180349

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