研究者詳細 - 薩摩　篤

論文 - 薩摩　篤

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Effects of hydrogen and oxygenated hydrocarbons on the activity and SO2-tolerance of Ag/Al2O3 for selective reduction of NO 査読有り

Ken-ichi Shimizu, Masao Tsuzuki, Atsushi Satsuma

Appl. Catal. B 71 巻頁： 80-84 2007年1月

Reactive Activation of O2 with H2 Reduced Silver Clusters a Key Step in the H2-Promoted Selective Catalytic Reduction of NO with C3H8 over Ag/Al2O3 査読有り

Ken-ichi Shimizu, Masao Tsuzuki, Kazuo Kato, Shigeru Yokota, Kazu Okumura, Atsushi Satsuma

J. Phys. Chem. C 111 巻頁： 950-959 2007年1月

記述言語：英語掲載種別：研究論文（学術雑誌）

The mechanistic cause of the dramatic activity improvement of alumina-supported silver (Ag/Al2O3)byH2 addition for the selective catalytic reduction of NO with propane (C3H8-SCR) was investigated by catalytic and spectroscopic studies. In situ UV-vis, in situ EXAFS, IR, and microcalorimetric experiments show that
H2 reduction of Ag+ ions on Ag/Al2O3 at 573 K yields protons on alumina and partially reduced Agn clusters, which are subsequently aggregated to larger Ag clusters. During H2 + O2 and H2-assisted C3H8-SCR reactions, Ag+ ions and Agn .+ coexist. Reoxidation with O2 results in the redispersion of the cluster to Ag+ ion, accompanying a reaction of protons. The relationship between cluster size, redox properties, and catalytic activity is examined using Ag/Al2O3 of different Ag loadings. The steady-state NO reduction rate correlates fairly well with the amount of Agn .+ during the H2-assisted C3H8-SCR reaction. It is shown that Agn .+ is the active species, whereas monomeric Ag+ ion and metallic Ag particles are inactive. With Ag loading, the Ag+ reduction rate increases and the rate of cluster reoxidation decreases. A balance between the rate of reduction and reoxidation of Ag species is an important factor that controls the size and oxidation state of the Ag species and consequently the catalytic activity of Ag/Al2O3. ESR has provided evidence, for the first time, for the in situ generation of superoxide ions in H2 + O2 and H2-assisted C3H8-SCR reactions. The comprehensive reason for the hydrogen effect in HC-SCR is discussed, focusing on the role of the cluster and protons on the reductive O2 activation to superoxide ion.

Mechanistic Study on Adsorptive Removal of tert-Butanethiol on Ag-Y Zeolite under Ambient Conditions 査読有り

Ken-ichi Shimizu, Nobumitsu Kobayashi, Atsushi Satsuma, Tohinori Kojima, and Sigeo Satokawa

J. Phys. Chem. B 110 巻頁： 22570-22576 2006年11月

Preparation of V2O5/TiO2 catalyst for NH3-SCR: Controlling factor of TiO2 support for highly active catalyst 査読有り

A. Satsuma, N. Furuta, T. Ogiso, M. Inoue, H. Kominami, K. Kagawa, and T. Hattori

Stud. Surf. Sci. Catal. 162 巻頁： 785-792 2006年9月

Contributions of three types of Ga sites in propane aromatization over Ga2O3/Ga-MOR catalysts 査読有り

, A. Satsuma, A. Gon-no, K. Nishi, S. Komai, and T. Hattori

Stud. Surf. Sci. Catal. 159 巻頁： 257-260 2006年6月

Selective Catalytic Reduction of NO over Supported Silver Catalysts - Practical and Mechanistic Aspects 招待有り査読有り

Ken-ichi Shimizu and Atsushi Satsuma

Phys. Chem. Chem. Phys. 8 巻頁： 2677 – 2695 2006年6月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Selective catalytic reduction of NO by hydrocarbons (HC-SCR) is one of the promising technologies for removal of NO in exhausts containing excess oxygen, such as diesel and lean burn gasoline engines. Supported Ag catalysts, especially Ag/Al2O3, are thought to be the promising candidates for use in diesel exhausts, as con.rmed by several reports on engine bench tests. The HC-SCR performance of supported Ag catalysts is very sensitive to the reaction conditions, especially the type of hydrocarbons and the addition of H2. The control of reaction conditions would be key for practical use. The current research of supported Ag catalysts is reviewed from the viewpoints of practical use and the reaction mechanism, i.e., the reaction scheme, the role of surface adsorbed species, and the structure of active Ag species.

Effect of hydrogen addition on SO2-tolerance of silver-alumina for SCR of NO with propane 査読有り

Ken-ichi Shimizu, Takaaki Higashimata, Masao Tsuzuki, Atsushi Satsuma

J. Catal. 239 巻頁： 117-124 2006年3月

Kinetic and in situ IR studies on SCR of NO with propane by silver-alumina catalyst: Role of H2 on O2 activation and retarding of nitrate-poisoning 査読有り

Ken-ichi Shimizu, Junji Shibata, Atsushi Satsuma

J. Catal. 239 巻頁： 402-409 2006年3月

Photoactive sites on pure silica materials for nonoxidative direct methane, coupling 査読有り

Leny Yuliati, Masanoti Tsubota, Atsushi Satsuma, Hideaki Itoh, Hisao Yoshida

J.Catal. 238 巻頁： 214-220 2006年1月

Involvement of Active Sites of Promoted Vanadyl Pyrophosphate in Selective Oxidation of Propane 査読有り

, Shinji Ieda, Satit Phiyanalinmat, Shin-ichi Komai, Tadashi Hattori, Atsushi Satsuma

J. Catal. 236 巻頁： 304-312 2005年12月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Involvement of active sites in the selective oxidation of propane was investigated using (VO)2P2O7 catalysts promoted by Sb, Ti, Zr, Hf, Cu, and Ce. Based on X-ray diffraction patterns, infrared spectra, and Raman spectra, the formation of a (VO)2P2O7 phase was con.rmed for all of the promoted catalysts; no other phases were detected. After the addition of Sb, Ti, and Zr, the selectivity to acrylic acid increased, whereas Cu-, Ce-, and Hf-promoted catalysts showed lower selectivity than pure (VO)2P2O7. The effect of promoters on the activity and selectivity for the propane oxidation was investigated on the basis of the nature of surface active sites. The surface V=O species, evaluated by the nitric oxide.ammonia rectangular pulse technique, decreased with the addition of the promoters. A proportional correlation between the number of surface V=O species and reaction rate of propane clari.ed that the surface V=O species is the controlling factor for the catalytic activity of propane oxidation. In the case of Sb-, Ti-, and Zr-promoted catalysts, the selectivity to acrylic acid increased signi.cantly. The selectivity was compared with the number and strength of Bronsted and Lewis acid sites estimated from dimethylpyridine temperature-programmed desorption. A good correlation was observed between the selectivity to acrylic acid and the surface concentration of Lewis acid sites. It was experimentally demonstrated that Lewis acid sites represent the key factor in selective oxidation.

Determination of Metal Dispersion of Pt/CeO2 Catalyst by CO-pulse Method 査読有り

Shinichi Komai, Yoshiteru Yazawa, Atsushi Satsuma, Tadashi Hattori

J. Jpn. Petro. Inst. 48 巻 ( 3 ) 頁： 173-177 2005年5月

Acidic properties of sulfonic acid-functionalized FSM-16 mesoporoussilic and its catalytic efficiency for acetalization of carbonyl compounds 査読有り

Ken-ichi Shimizu, Eidai Hayashi, Tsuyoshi Hatamachi, Tatsuya Kodama,Tomoya Higuchi, Atsushi Satsuma, Yoshie Kitayama

Journal of Catalysis 231 巻頁： 131-138 2005年4月

Direct loading of fine particles of Pd on activated carbon in aqueous solution and NO conversion 査読有り

Tomoyuki Okuni, Yasuhiro Sahashi, Atsushi Satsuma, Hidetaka Konno, and Michio Inagaki

TANSO 217 巻頁： 95-98 2005年4月

Acidic properties of sulfonic acid-functionalized FSM-16 mesoporoussilic and its catalytic efficiency for acetalization of carbonyl compounds 査読有り

Ken-ichi Shimizu, Eidai Hayashi, Tsuyoshi Hatamachi, Tatsuya Kodama,Tomoya Higuchi, Atsushi Satsuma, Yoshie Kitayama

231 巻頁： 131-138 2005年4月

Stability of Pd(II) Ion in Side Pocket of Mordenite under Hydrothermal Conditions 査読有り

Atsushi Satsuma, Yasuhiro Sahashi, Junji Shibata, Koji Nishi, Shigeo Satokawa, Keiji Itabashi, Shin-ichi Komai, Hisao Yoshida, and Tadashi Hattori

Micro. Meso. Mater 81 巻頁： 135-138 2005年3月

Factors controlling activity and selectivity for SCR of NO by hydrogen over supported Pt catalysts

Junji Shibata, Masanori Hashimoto, Ken-ichi Shimizu, Hisao Yoshida, Tadashi Hattori and Atsushi Satsuma

108 巻頁： 18327-18335 2004年10月

Ag Cluster as Active Species for SCR of NO by propane in the Presence of Hydrogen over Ag-MFI 査読有り

Junji Shibata, Yuu Takada, Akira Shichi, Sigeru Satokawa, Atsushi Satsuma, Tadashi Hattori

J. Catal. 222 巻頁： 368-376 2004年

Influence of zeolite support on activity enhancement by addition of hydrogen for SCR of NO by propane over Ag-zeolites 査読有り

Junji Shibata, Yuu Takada, Akira Shichi, Shigeo Satokawa, Atsushi Satsuma, Tadashi Hattori

Appl. Catal. B 54 巻 ( 3 ) 頁： 137-144 2004年

Application of Neural Network to Estimation of Catalyst Deactivation in Methanol Conversion 査読有り

S. Kito, A. Satsuma, T. Ishikura, M. Niwa, Y. Murakami, and T. Hattori

Catal. Today 97 巻頁： 41-47 2004年

Structure of active Ag clusters in Ag-zeolites for SCR of NO by propane in the presence of hydrogen 査読有り

Junji Shibata, Ken-ichi Shimizu, Yuu Takada, Akira Shichi, Hisao Yoshida, Shigeo Satokawa, Atsushi Satsuma, and Tadashi Hattori

J. Catal. 227 巻頁： 367-374 2004年

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