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Now showing items 1 - 11 of 11

  • PLASMA GENERATING ELECTRODE, ELECTRODE PANEL, AND PLASMA REACTOR

    [Problem] To provide a plasma generating electrode, an electrode panel and a plasma reactor with which it is possible to restrict the deposition of particulate matter (PM) on the surface of a dielectric. [Solution] An electrode 23 is formed in the shape of a lattice having wire-shaped portions 31 and 32 which extend in the longitudinal direction and the lateral direction respectively. The electrode 23 has multiple rectangular mesh openings 33 each of which is enclosed by two longitudinal wire-shaped portions 31 and two lateral wire-shaped portions 32. The mesh openings 33 are smallest (finest) in a first part 34 on the most upstream side in the direction of flow of exhaust gas, and become larger (coarser) in stages toward the downstream side in the direction of flow of the exhaust gas. In other words, the density of the lattice formed by the longitudinal wire-shaped portions 31 and the lateral wire-shaped portions 32 of the electrode 23 is greatest in the first part 34 on the most upstream side in the direction of flow of the exhaust gas, and decreases in stages toward the downstream side in the direction of flow of the exhaust gas.
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  • PLASMA REACTOR APPLIED VOLTAGE CONTROL DEVICE AND PLASMA REACTOR CONTROL DEVICE

    [Problem] To provide an applied voltage control device and the like which are capable of controlling, with a high degree of precision, the applied voltage applied between electrodes of a plasma reactor. [Solution] The current output from a pulse generating power source 5 is detected by a current sensor 42, and the values of the detected current are integrated by a current integrating circuit 43. There is a correlation between integrated current value obtained from the integration and the applied voltage value applied between electrodes 23 of a plasma reactor 4, and that relationship is stored in an applied voltage value estimation unit 44. When an integrated current value is obtained, an applied voltage value corresponding to the integrated current value is estimated on the basis of the relationship stored in the applied voltage value estimation unit 44. A power source 31 is then controlled on the basis of the estimated applied voltage value.
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  • EXHAUST GAS PURIFYING CATALYST

    To provide an exhaust gas purifying catalyst which is capable of exhibiting more excellent gas purification performance, while reducing the amount of a noble metal used therein. An exhaust gas purifying catalyst wherein: a heat-resistant oxide is loaded with palladium and copper and/or an alloy of palladium and copper; the copper content is set larger than the palladium content; and the ratio of the palladium content is set to 0.2% by mass or less relative to the total amount of the heat-resistant oxide, palladium and copper. This exhaust gas purifying catalyst is able to decrease the cost by reducing the amount of a noble metal used therein, while efficiently purifying an exhaust gas, in particular, efficiently removing CO and NOx.
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  • CATALYST COMPOSITION

    A catalyst composition which, when used for long at a high temperature or with fluctuations in oxidation/reduction, is prevented from undergoing the growth of noble-metal grains and suffering the resultant decrease in catalytic activity and which can realize excellent catalytic activity over long. The catalyst composition contains a composite oxide represented by the following general formula (1). AO·x(B2-yCyO3-α) (1) (In the formula, A represents an element selected among monovalent elements, divalent elements, and lanthanides; B represents a trivalent element; C represents a noble metal; x is an integer of 1-6; y, indicating the atomic proportion, is 0 (adsbygoogle = window.adsbygoogle || []).push({}); TANAKA, Hirohisa (3000, Oaza Yamanoue, Ryuo-ch, Gamo-gun Shiga 93, 5202593, JP) 田中 裕久 (〒93 滋賀県蒲生郡竜王町大字山之上3000番地 ダイハツ工業株式会社 滋賀テクニカルセンター内 Shiga, 5202593, JP) TAN, Isao (3000, Oaza Yamanoue, Ryuo-ch, Gamo-gun Shiga 93, 5202593, JP) 丹 功 (〒93 滋賀県蒲生郡竜王町大字山之上3000番地 ダイハツ工業株式会社 滋賀テクニカルセンター内 Shiga, 5202593, JP) UENISHI, Mari (3000, Oaza Yamanoue, Ryuo-ch, Gamo-gun Shiga 93, 5202593, JP) 上西 真里 (〒93 滋賀県蒲生郡竜王町大字山之上3000番地 ダイハツ工業株式会社 滋賀テクニカルセンター内 Shiga, 5202593, JP) JP2007/054565 10/11/2007 03/08/2007 Click for automatic bibliography generation DAIHATSU MOTOR CO., LTD. (1-1 Daihatsucho, Ikeda-shi Osaka, 51, 5638651, JP) ダイハツ工業株式会社 (〒51 大阪府池田市ダイハツ町1番1号 Osaka, 5638651, JP) CATALER CORPORATION (7800, Chihama Kakegawa-sh, Shizuoka 92, 4371492, JP) 株式会社キャタラー (〒92 静岡県掛川市千浜7800番地 Shizuoka, 4371492, JP) TANAKA, Hirohisa (3000, Oaza Yamanoue, Ryuo-ch, Gamo-gun Shiga 93, 5202593, JP) 田中 裕久 (〒93 滋賀県蒲生郡竜王町大字山之上3000番地 ダイハツ工業株式会社 滋賀テクニカルセンター内 Shiga, 5202593, JP) TAN, Isao (3000, Oaza Yamanoue, Ryuo-ch, Gamo-gun Shiga 93, 5202593, JP) 丹 功 (〒93 滋賀県蒲生郡竜王町大字山之上3000番地 ダイハツ工業株式会社 滋賀テクニカルセンター内 Shiga, 5202593, JP) B01J23/56 ; B01D53/94 ; B01J23/89 Download PDF WO/2007/113981A1 PDF help WO2002066403A1 N/A 2002-08-29 JPH01262945A 1989-10-19 JPH02126939A 1990-05-15 JP2002052342A 2002-02-19 JP2006051431A 2006-02-23 6444178 2002-09-03 FR2857003A1 2005-01-07 EP1317953 2003-06-11 EP1186335 2002-03-13 See also references of EP 2000201A4 OKAMOTO, Hiroyuki (Sun Mullion NBF Tower 21st Floor,6-12, Minamihommachi 2-chome,Chuo-k, Osaka-shi Osaka 54, 5410054, JP)
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  • Mg0.7Cu0.3Al2O4 Spinel-type Catalyst Active for CO Oxidation under Practical Conditions

    Taniguchi, Masashi   Uenishi, Mari   Tanaka, Hirohisa   Mizuno, Noritaka  

    Mg1-xCuxAl2O4 (x = 0-1.0) and Mg0.7M0.3Al2O4 (M = Mn, Co, and Ni) spinel-type catalysts with high surface areas were prepared. While a Cu-free MgAl2O4 spinel-type oxide showed no catalytic activity for the CO-O-2 reaction, the activity was significantly increased by the substitution of Mg (A-site) with Cu, and Mg0.7Cu0.3Al2O4 showed the highest catalytic activity under the practical conditions. The catalytic activities of Mg0.7M0.3Al2O4 (M = Mn, Co, Ni, and Cu) much depended on the kinds of M, and Cu was the best substituent metal. The catalytic activity of Mg0.7Cu0.3Al2O4 was much higher than those of La0.8Sr0.2CoO3 and LaMn0.6Cu0.4O3, which have been reported to be active for the CO-O-2 reaction. The highest catalytic activity of Mg0.7Cu0.3Al2O4 probably results from the easiest reducibility.
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  • EXHAUST GAS PURIFYING CATALYST

    Disclosed is an exhaust gas purifying catalyst (1) containing a rare earth element, an alkaline earth element, zirconium and a noble metal. The atomic ratio of the alkaline earth element relative to the sum of the rare earth element and zirconium is not less than 10 at%. A part of the rare earth element and a part of zirconium form a complex oxide together with at least a part of the alkaline earth element, and this complex oxide and a part of the noble metal form a solid solution.
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  • CATALYSTS

    Catalysts wherein noble metals are efficiently supported on the surfacemost layers thereof. Catalysts obtained by forming a double oxide layer on a carrier in such a way that the layer can contain a perovskite-type double oxide represented by the general formula (1) and other double oxide and dipping the resulting carrier in an aqueous solution of a noble metal salt to incorporate the solution in the carrier and form a noble metal layer in a state supported on the surfacemost layer of the carrier: AxByO3±δ (1) wherein A is at least one element selected from among rare earth elements and alkaline earth metals; B is at least one element selected from among transition elements (except rare earth elements); x is an atomic fraction of less than 1; y is an atomic fraction of 1.0; and δ is an excess or deficiency of oxygen.
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  • A theoretical study of the reactivity of Cu2O(111) surfaces: the case of NO dissociation

    Kishi, Hirofumi   Padama, Allan Abraham Bustria   Arevalo, Ryan Lacdao   Moreno, Joaquin Lorenzo Valmoria   Kasai, Hideaki   Taniguchi, Masashi   Uenishi, Mari   Tanaka, Hirohisa   Nishihata, Yasuo  

    We compare the electronic properties of Cu(111) and Cu2O(111) surfaces in relation to the dissociation of NO using first principles calculations within density functional theory. We note a well-defined three-fold site on both O- and Cu-terminated Cu2O surfaces which is verified as the active site for the adsorption and dissociation of NO. The interaction of Cu with O atoms results in the forward shifting of the local density of states and formation of unoccupied states above the Fermi level, compared to the fully occupied d band of pure Cu. These results give valuable insights in the realization of a catalyst without precious metal for the dissociation of NO.
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  • Intelligent catalyst having the self-regenerative function of Pd, Rh and Pt for automotive emissions control

    Tanaka, Hirohisa   Uenishi, Mari   Taniguchi, Masashi   Tan, Isao   Narita, Keiichi   Kimura, Mareo   Kaneko, Kimiyoshi   Nishihata, Yasuo   Mizuki, Jun'ichiro  

    The self-regenerative function of precious metals in the intelligent catalyst is an epoch-making technology in the history of automotive catalysts after the 1970's. The mechanism of the self-regenerative function is studied by X-ray absorption fine-structure (XAFS) analyses. The function was realized through a cyclic movement of Pd between the outside (as Pd nanoparticles) and the inside (as Pd cations in the lattice) of the perovskite crystal in synchronization with the inherent fluctuations between reductive and oxidative (redox) atmospheres that occur in real automotive exhaust gases. As the result, the growth of Pd particles can be suppressed during the entire lifetime of the vehicle. Moreover, the speed of this function was measured at the time resolution of a 10 ms by in situ energy dispersive XAFS, and it is proved that the self-regenerative function occurs at an extremely high speed. Furthermore, the new perovskite catalysts which have the self-regenerative function of Rh and Pt, as well as Pd, are discussed here. This self-regenerative function provides a new and useful tool for designing the future catalyst technology. (C) 2006 Elsevier B.V. All rights reserved.
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  • Dynamic structural change in Pd-perovskite automotive catalyst studied by time-resolved dispersive x-ray absorption fine structure

    Matsumura, Daiju   Nishihata, Yasuo   Mizuki, Jun'ichiro   Taniguchi, Masashi   Uenishi, Mari   Tanaka, Hirohisa  

    Dynamic structural change in Pd-perovskite automotive catalyst, LaFe(0.9)Pd(0.1)O(3), which has a high catalytic activity during aging, was studied by in situ time-resolved dispersive x-ray absorption fine structure spectroscopy at 200-500 degrees C. An Al(2)O(3)-based conventional catalyst was also studied. In a reductive atmosphere, both catalysts showed similar temperature dependences of structural transformation from an oxide to a metal. However, different temperature dependence was observed in an oxidative atmosphere. A faster response in the structural change was observed in the Pd-perovskite catalyst than in the Pd/Al(2)O(3) catalyst. It was revealed that Pd-perovskite shows a considerably fast structural change to the oxidized state via the movement of Pd atoms into the perovskite crystal, in comparison with Pd/Al(2)O(3) showing two-step structural change for making PdO. (C) 2010 American Institute of Physics. [doi :10.1063/1.3437084]
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  • Time evolution of palladium structure change with redox fluctuations in a LaFePdO3 perovskite automotive catalyst by high-speed analysis with in situ DXAFS RID A-9953-2009

    Uenishi, Mari   Tanaka, Hirohisa   Taniguchi, Masashi   Tan, Isao   Nishihata, Yasuo   Mizuki, Jun'ichiro   Kobayashi, Tetsuhiko  

    In the LaFePdO3 perovskite catalyst, redox fluctuations of the exhaust gas suppress the growth of particles of precious metal by causing Pd to move in and out of the perovskite crystal. To observe the real movements of Pd directly, the time evolution of local structure around I'd by redox fluctuations was investigated by in situ energy-dispersive X-ray absorption fine-structure (DXAFS) analysis with a 10 ms resolution. We proved that the change in structure of Pd is sufficiently fast to respond to the control frequency (1-4 Hz) of an actual gasoline engine and that the Pd particles that segregate out are extremely fine. (C) 2007 Elsevier B.V. All rights reserved.
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