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Author

Hamada Hideaki

Other affiliations: Cosmo Oil Company
Bio: Hamada Hideaki is an academic researcher from National Chemical Laboratory. The author has contributed to research in topics: Catalysis & Nitrogen oxide. The author has an hindex of 8, co-authored 39 publications receiving 912 citations. Previous affiliations of Hamada Hideaki include Cosmo Oil Company.
Topics: Catalysis, Nitrogen oxide, NOx, Exhaust gas, Oxide

Papers
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Journal ArticleDOI
TL;DR: In this paper, the present position of decomposition catalysts is mentioned and the catalytic performance of copper ion-exchanged zeolites and Ag-Co3O4 oxides is summarized based on the respective authors' results.

749 citations

Patent
27 Oct 1992
TL;DR: In this paper, a process for reducing nitrogen oxides to nitrogen from exhaust gases is described, which involves bringing an exhaust gas containing nitrogen oxide into contact with at least one catalyst from proton-type zeolites, including metal oxides, by reaction with a hydrocarbon or an oxygen-containing organic compound in an oxidizing atmosphere containing excess oxygen.
Abstract: A process for reducing nitrogen oxides to nitrogen from exhaust gases is disclosed, which involves bringing an exhaust gas containing nitrogen oxides into contact with at least one catalyst from proton-type zeolites, zeolites of an alkali metal exchanged form and acidic metal oxides, by reaction with a hydrocarbon or an oxygen-containing organic compound in an oxidizing atmosphere containing excess oxygen. A process which further involves bringing the exhaust gas into contact with an oxidizing catalyst subsequent to the above process.

28 citations

Patent
28 Dec 1993
TL;DR: In this paper, a process for removing nitrogen oxide from exhaust is disclosed, comprising contacting exhaust containing nitrogen oxide with an alumina catalyst which contains not more than 0.5% by weight of an alkali metal and/or an alkaline earth metal.
Abstract: A process for removing nitrogen oxide from exhaust is disclosed, comprising contacting exhaust containing nitrogen oxide with an alumina catalyst which contains not more than 0.5% by weight of an alkali metal and/or an alkaline earth metal and has a total pore volume of from 0.48 to 1.2 cm 3 ·g -1 with 0.26 to 0.6 cm 3 ·g -1 of the total pore volume being formed of pores of not greater than 80 Å or has a volume of pores formed of pores of not greater than 60 Å of from 0.06 to 0.2 cm 3 ·g -l and which may have supported thereon tin in an oxidative atmosphere containing excess oxygen in the presence of a hydrocarbon or an oxygen-containing organic compound.

16 citations

Patent
11 Jun 1996
TL;DR: In this article, the authors used alcohol as a reducing agent when NOx in exhaust gas is selectively and catalytically reduced with a reduction agent in the presence of a catalyst.
Abstract: PURPOSE: To efficiently and catalytically reduce NOx in exhaust gas by using alcohol as a reducing agent when NOx in exhaust gas is selectively and catalytically reduced with a reducing agent in the presence of a catalyst. CONSTITUTION: When harmful NOx contained in exhaust gas discharged from an automobile, etc., is selectively and catalytically reduced with a reducing agent, alcohol is added as the reducing agent to the exhaust gas and this reducing agent is brought into contact with a catalyst to reduce and remove the NOx. By this method, NOx in exhaust gas is efficiently removed under coexistence of nitrogen. The alcohol is lower alcohol which is liq. at ordinary temp. and becomes gas at a reaction temp. and it is preferably ethanol, propanol or isopropanol. The amt. of the alcohol added is preferably 0.1-10 times (mol) that of NOx contained in exhaust gas.

15 citations

Patent
08 Jan 1991
TL;DR: In this article, a reduction reaction between NOx and hydrocarbons on a reduction catalyst in an oxidative atmosphere, NO2 is reduced more easily than NO, an exhaust gas is previously contacted with an oxidation catalyst to oxidize NO in the exhaust gas into NO2.
Abstract: PURPOSE:To remove NOx in an exhaust gas efficiently. CONSTITUTION:From a viewpoint that in the reduction reaction between NOx and hydrocarbons on a reduction catalyst in an oxidative atmosphere, NO2, is reduced more easily than NO, an exhaust gas is previously contacted with an oxidation catalyst to oxidize NO in the exhaust gas into NO2. The treated exhaust gas, in an oxidative atmosphere containing excessive oxygen and in the presence of hydrocarbons, is contacted with a reduction catalyst selected from zeolite of a proton type, zeolite of an alkali metal type, and acid metal oxide (metal oxide treated with a compound having sulfate group to reduce NO2, in the exhaust gas into nitrogen.

14 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, the infrared spectral performance of N x O y species observed on oxide surfaces [N2O, NO−, NO, (NO)2, N2O3, NO+, NO2 − (different nitro and nitrito anions), NO2, n2O4, N 2O5, NO2 and NO3 − (bridged, bidentate, and monodentate nitrates)] is considered.
Abstract: The infrared spectral performance of the N x O y species observed on oxide surfaces [N2O, NO−, NO, (NO)2, N2O3, NO+, NO2 − (different nitro and nitrito anions), NO2, N2O4, N2O5, NO2, and NO3 − (bridged, bidentate, and monodentate nitrates)] is considered. The spectra of related compounds (N2, H-, and C-containing nitrogen oxo species, C─N species, NH x species) are also briefly discussed. Some guidelines for spectral identification of N x O y adspecies are proposed and the transformation of the nitrogen oxo species on catalyst surfaces are regarded.

1,367 citations

Journal ArticleDOI
TL;DR: In this article, the authors illustrate the technology for abatement of exhaust emissions by analysing the current understanding of TWCs, the specific role of the various components, the achievements and the limitations.

1,187 citations

Journal ArticleDOI
TL;DR: In this paper, the authors review the catalytic reactions for the removal of NO and discuss the reduction of NO in the presence of NH3, CO, H-2 or hydrocarbons as well as the decomposition of NO.

1,110 citations

Journal ArticleDOI
TL;DR: In this paper, a review of the literature on NO catalysis is presented, focusing on the threeway catalyst system which simultaneously promotes the reduction of nitrogen oxides and the oxidation of carbon monoxide and hydrocarbons.
Abstract: This review covers the literature through 1991 on nitric oxide catalysis as applied to automobile exhaust systems. Attention is given to the threeway catalyst system which simultaneously promotes the reduction of nitrogen oxides and the oxidation of carbon monoxide and hydrocarbons. These systems have been used on most passenger cars in the United States since 1982. Prior to 1980, emission control catalysts were oxidation catalysts, and reduction in exhaust nitric oxide was achieved using engine modifications (i.e., exhaust gas recirculation). This review focuses on catalytic control of NO, for gasoline-fueled vehicles (not diesels and alternate fuels) and primarily on developments reported since 1982. The term NO, refers to both NO and NOz. The reader is referred to an earlier publication by the author for a general review of automobile catalytic converters [1] and to a review by Egelhoff [2] on the nitric oxide literature through 1980. The recent literature on NO, reduction in lean exhaust is c...

746 citations

Journal ArticleDOI
TL;DR: In this paper, the main portion of the review discusses the progress and development of various catalysts for NOx removal from exhaust by NO decomposition, NO reduction by CO or H-2 or NH3 or hydrocarbons.

616 citations