Hideharu Iwakuni
Mazda
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Featured researches published by Hideharu Iwakuni.
Catalysis Today | 1997
Akihide Takami; Takashi Takemoto; Hideharu Iwakuni; K. Yamada; Masahiko Shigetsu; Kazunari Komatsu
The effects of the zeolite-supported precious metal catalysts on NOx reduction in oxygen-rich exhaust have been investigated. It became clear that NOx conversion related the number of NO adsorption sites of precious metal and the number of HC (C3H6) adsorption of support (zeolite). PtIrRh/MFI zeolite catalyst showed higher performance and durability than the current PtRh supported on alumina and ceria catalyst.
Studies in Surface Science and Catalysis | 1999
Hideharu Iwakuni; Akihide Takami; Kazunari Komatsu
Abstract Lean NOx catalyst for a lean burn gasoline engine was developed. This catalyst could constantly reduce NOx under lean burn driving condition by using hydrocarbon as a reducing agent. This catalyst consists of platinum (Pt), iridium (Ir) and rhodium (Rh) as active metals and H-MFI type zeolite as a support material. This catalyst had high thermal durability that was caused by Pt-Ir-Rh composite that suppressed the growth of particle size of itself during thermal aging and MFI zeolite that had high thermal durability and HC trap activity. Lean burn vehicle with this developed catalyst achieved emission legislation limit after an engine endurance test and improved 16% of fuel economy at JPN 10-15 mode.
MTZ worldwide | 2009
Akihide Takami; Yoshinori Tsushio; Kouichiro Harada; Hiroshi Yamada; Seiji Miyoshi; Hideharu Iwakuni
The new shape ceria-based support material for a lean Nitrogen oxide (NOx) trap catalyst (LNT) was developed by Mazda. It has a unique shape that each fine particle of raw material is formed into hollow sphere. Samples of platinum loaded powder catalysts were obtained with either the hollow sphere ceria-based material or two kinds of the conventional shape one and their catalytic activities were evaluated with the synthetic gas. The characterisation results indicate that the hollow sphere ceria-based material had high thermal stability [1].
MTZ - Motortechnische Zeitschrift | 2009
Akihide Takami; Yoshinori Tsushio; Kouichiro Harada; Hiroshi Yamada; Seiji Miyoshi; Hideharu Iwakuni
Die Reduktion von NOx wird am effizientesten durch die Reduzierung der NOx-Emissionen waehrend der fetten Betriebsphase gefoerdert. Einer der Schluesselfaktoren ist das Beguenstigen dieser Reaktion zur Erhoehung der thermischen Bestaendigkeit des Traegermaterials, auf welchem die Edelmetalle und NOx-Speichermaterialien aufgebracht sind. Mazda hat dazu ein neu geformtes Traegermaterial auf Ceroxid-Basis fuer einen Stickoxid-Speicherkatalysator entwickelt und seine katalytischen Eigenschaften untersucht. Es besitzt eine einzigartige Form, durch die jeder feine Partikel des Ausgangsstoffes zu einer Hohlkugel geformt wird. Drei Proben platinbeladener Pulverkatalysatoren auf Ceroxid-Basis wurden vorbereitet: eine mit dem neuen Hohlkugelmaterial und zwei Proben mit herkoemmlicher Form. Ihre katalytischen Eigenschaften wurden dann mit synthetischem Gas ausgewertet. Die Analyseergebnisse zeigten, dass das Hohlkugelmaterial auf Ceroxid-Basis eine hohe thermische Bestaendigkeit aufweist. Die Katalysatorleistung wurde an einem Pt-Katalysator untersucht.
Archive | 1997
Koji Minoshima; Hiroshi Yamada; Seiji Miyoshi; Hideharu Iwakuni; Akihide Takami
Archive | 1996
Takahiro Kurokawa; Akihide Takami; Makoto Kyogoku; Hideharu Iwakuni; Kenji Okamoto; Hirosuke Sumida; Kenichi Yamamoto; Hiroshi Murakami; Hiroshi Yamada
Archive | 1999
Hiroshi Yamada; Akihide Takami; Hideharu Iwakuni; Makoto Kyogoku; Kenji Okamoto
Archive | 1998
Akihide Takami; Hideharu Iwakuni; Makoto Kyogoku; Hiroshi Yamada; Kenji Okamoto; Junichi Taga; Tomomi Watanabe; Hirofumi Nishimura; Tadataka Nakazumi; Youichi Kuji; Masayuki Kuroki
Archive | 2007
Seiji Miyoshi; Hideharu Iwakuni; Koji Minoshima; Hiroshi Yamada; Masaaki Akamine; Akihide Takami
Archive | 1999
Hideharu Iwakuni; Makoto Kyogoku; Hiroshi Yamada; Akihide Takami