大山順也 (Junya Ohyama) - 論文

Rh K-Edge High-Energy-Resolution Fluorescence-Detected X-ray Absorption Near-Edge Structure Spectroscopy Reveals Deactivated RhAlO_x Structure in Aged Rh/γ-Al₂O₃ Catalyst

Mizuki Sato, Keisuke Awaya, Masayuki Tsushida, Masato Machida, Nozomu Hiraoka, Junya Ohyama

ACS Catalysis 6466-6472 2025年4月6日

Dynamics of CeO₂-Supported Pt Nanoparticles in CO Oxidation Reaction Revealed by Millisecond Time-Resolved HERFD-XANES Spectroscopy

Junya Ohyama, Mizuki Sato, Masayuki Tsushida, Keisuke Awaya, Masato Machida, Tomoya Uruga, Kotaro Higashi

Catalysis Science & Technology 2025年査読有り責任著者

ABO₄ as an Active Catalyst Structure for Direct Partial CH₄ Oxidation as Identified through Screening of Supported Catalysts

Junya Ohyama, Yuriko Yoshioka, Momoka Tsukamoto, Rina Kuroki, Daichi Takahashi, Keisuke Awaya, Masato Machida, Kotaro Higashi, Tomoya Uruga, Naomi Kawamura …

ACS Catalysis 697-705 2024年12月24日査読有り責任著者

The Impact of Metal–Support Interaction on the Structure and Activity of Carbon-Supported Ni Nanoparticle Catalysts for Alkaline Hydrogen Oxidation Reaction

Yoshiki Akamine, Fumiya Nishino, Takashi Yamashita, Masayuki Tsushida, Keisuke Awaya, Masato Machida, Syeda Mushrifa Zahan, Dario R. Dekel, Junya Ohyama

ACS Applied Materials & Interfaces 2024年12月8日査読有り責任著者

Improved Catalytic Partial Oxidation of Methane via Lattice Oxygen Modification on Supported Copper Oxide Catalyst System

Junya Ohyama, Hiroki Iwai, Daichi Takahashi, Masayuki Tsushida, Masato Machida, Shun Nishimura, Keisuke Takahashi

ChemCatChem 2024年8月13日査読有り責任著者

Structural Effects of FeN4 Active Sites Surrounded by Fourteen-Membered Ring Ligands on Oxygen Reduction Reaction Activity and Durability

Zhiqing Feng, Soutaro Honda, Junya Ohyama, Yasushi Iwata, Keisuke Awaya, Hiroshi Yoshida, Masato Machida, Kotaro Higashi, Tomoya Uruga, Naomi Kawamura …

ACS Catalysis 2024年5月17日査読有り責任著者

Pt Oxide Nanoclusters Supported on ZrP2O7 for Selective NOx Reduction by H2 in the Presence of O2 with Negligible NH3, N2O, and NO2 Byproducts

Masato Machida, Koshi Nishiyama, Mana Furukubo, Hiroshi Yoshida, Keisuke Awaya, Junya Ohyama, Masayuki Tsushida, Mayuko Suwa, Yuki Nagao, Yoshinori Endo …

ACS Applied Nano Materials 2024年1月12日査読有り

In-situ QXAFS study on CO and H₂ adsorption on Pt in solid [PtAu₈(PPh₃)₈]-H[PMo₁₂O₄₀]

Tomoki Matsuyama, Taishi Suzuki, Yuto Oba, Soichi Kikkawa, Sayaka Uchida, Junya Ohyama, Kotaro Higashi, Takuma Kaneko, Kazuo Kato, Kiyofumi Nitta …

Nanoscale 2024年

Selective catalytic NO_x reduction by H₂ in excess O₂ over Pt/zirconium phosphate nanosheets

Keisuke Awaya, Yuka Sato, Aoi Miyazaki, Mana Furukubo, Koshi Nishiyama, Masayuki Tsushida, Shintaro Ida, Junya Ohyama, Masato Machida

Catalysis Science & Technology 2024年

Thermal Deactivation of Pd/Al2O3–Cu/Al2O3-combined Three-way Catalysts via Cu Migration and Alloying

Zannatul Mumtarin Moushumy, Marina Takeuchi, Masayuki Tsushida, Keisuke Awaya, Hiroshi Yoshida, Junya Ohyama, Masato Machida

Catalysis Science & Technology 2024年

Catalytic NH₃ oxidation affected by the nanometric roughness of the platinum overlayer

Masato Machida, Nayu Yamasaki, Tomoya Miyoshi, Hiroki Kusaba, Tetsuya Sato, Keisuke Awaya, Hiroshi Yoshida, Junya Ohyama, Teppei Ohori, Kohei Oka …

Nanoscale 16(20) 9781-9790 2024年

Atomic‐Scale 3D Structure of a Supported Pd Nanoparticle Revealed by Electron Tomography with Convolution Neural Network‐Based Image Inpainting

Hiroki Iwai, Fumiya Nishino, Tomokazu Yamamoto, Masaki Kudo, Masayuki Tsushida, Hiroshi Yoshida, Masato Machida, Junya Ohyama

Small Methods 2023年12月3日査読有り責任著者

Dynamic Change of Rh Oxidation State During Lean‐Rich Perturbation and Light‐Off of Three‐Way Catalysis Analysed using In Situ Diffuse Reflectance UV‐vis Spectroscopy

Ayumi Fujiwara, Yutaro Tsurunari, Shundai Iwashita, Hiroshi Yoshida, Junya Ohyama, Masato Machida

ChemCatChem 2023年10月6日査読有り

Relationship between Redox Rate and Catalytic Activity of Cu Zeolite in the Partial Oxidation of Methane

Junya OHYAMA, Airi HIRAYAMA, Hiroshi YOSHIDA, Masato MACHIDA, Kazuo KATO, Shun NISHIMURA, Keisuke TAKAHASHI

Journal of the Japan Petroleum Institute 66(5) 180-184 2023年9月1日査読有り責任著者

Kinetics-Based Prediction for Sintering of Pd/CeO2–ZrO2–Al2O3 Three-Way Catalysts during Engine-Bench Aging

Shundai Iwashita, Ayumi Fujiwara, Hiroshi Yoshida, Junya Ohyama, Takeshi Miki, Masato Machida

Industrial & Engineering Chemistry Research 2023年6月28日査読有り

Investigation of the Active-Site Structure of Cu-CHA Catalysts for the Direct Oxidation of Methane to Methanol Using In Situ UV–Vis Spectroscopy

Yuka Tsuchimura, Hiroshi Yoshida, Masato Machida, Shun Nishimura, Keisuke Takahashi, Junya Ohyama

Energy & Fuels 2023年6月13日査読有り責任著者

Pt–Ni Thin-Film Catalyst for the Hydrogen Oxidation Reaction under Alkaline Conditions

Junya Ohyama, Hideto Ushijima, Takashi Yamashita, Akihiro Yamashita, Hiroshi Yoshida, Masato Machida

ACS Applied Energy Materials 2023年6月12日査読有り責任著者

Rh Nanoparticles Dispersed on ZrO2–CeO2 Migrate to Al2O3 Supports to Mitigate Thermal Deactivation via Encapsulation

Masato Machida, Hideto Yoshida, Naoto Kamiuchi, Yasuhiro Fujino, Takeshi Miki, Masaaki Haneda, Yutaro Tsurunari, Shundai Iwashita, Rion Ohta, Hiroshi Yoshida …

ACS Applied Nano Materials 2023年6月9日査読有り

Thermal Aging of Rh/ZrO₂–CeO₂ Three-Way Catalysts under Dynamic Lean/Rich Perturbation Accelerates Deactivation via an Encapsulation Mechanism

Masato Machida, Hideto Yoshida, Naoto Kamiuchi, Yasuhiro Fujino, Takeshi Miki, Masaaki Haneda, Yutaro Tsurunari, Shundai Iwashita, Rion Ohta, Hiroshi Yoshida …

ACS Catalysis 3806-3814 2023年3月3日

Ce-modified Rh overlayer for a three-way catalytic converter with oxygen storage/release capability

Hiroshi Yoshida, Tomoyo Koide, Takuya Uemura, Yusuke Kuzuhara, Junya Ohyama, Masato Machida

Catalysis Today 410 102-108 2023年2月15日

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