Journal ArticleDOI
Selective reduction of nitrogen oxides with hydrocarbons over solid acid catalysts in oxygen-rich atmospheres
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In this article, the acidity of a series of silica-alumina catalysts is suggested to be one of the main factors that determine catalytic activity. But this is not the case for all catalysts.Abstract:
Highly selective reduction of nitrogen oxides to dinitrogen occurs to a high level in oxygen-rich atmospheres by using a small amount of propane as a reducing agent over alumina, silica-alumina, titania and zirconia catalyst. Judging from the data of activity and ammonia TPD measurement on a series of silica-alumina catalysts, acidity is suggested to be one of the main factors that determine catalytic activity.read more
Citations
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Journal ArticleDOI
Catalytic removal of NO
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.
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A review of the selective reduction of NOx, with hydrocarbons under lean-burn conditions with non-zeolitic oxide and platinum group metal catalysts
TL;DR: In this paper, it is concluded that although there is indirect, mainly spectroscopic, evidence for various reaction intermediates on the catalyst surface, it is difficult to confirm that any of these are involved in a critical mechanistic step because of a lack of a direct quantitative correlation between infrared and kinetic measurements.
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The new concept 3-way catalyst for automotive lean-burn engine: NOx storage and reduction catalyst
Naoki Takahashi,Hirofumi Shinjoh,Tomoko Iijima,Tadashi Suzuki,Kiyoshi Yamazaki,Koji Yokota,Hiromasa Suzuki,Naoto Miyoshi,Shinichi Matsumoto,Tsuneyuki Tanizawa,Toshiaki Tanaka,Syu-shi Tateishi,Kouichi Kasahara +12 more
TL;DR: In this article, a 3-way catalysts for a lean-burn engine have been developed, and their NOx purification mechanisms have been studied, which consist of precious metals, aluminum oxide and some other metal compounds such as NOx, storage compounds.
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Removal of nitrogen monoxide from exhaust gases through novel catalytic processes
Masakazu Iwamoto,Hamada Hideaki +1 more
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.
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Nitric oxide catalysis in automotive exhaust systems
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.
References
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Journal ArticleDOI
Mechanism of the reaction of NO and NH3 on vanadium oxide catalyst in the presence of oxygen under the dilute gas condition
TL;DR: In this paper, the authors showed that the NO-NH 3 reaction on vanadium oxide catalyst under the dilute gas condition was markedly accelerated by the addition of O 2, and the oxygen species responsible for the acceleration of the reaction was found to be the V 3+ O species on the catalyst.
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Selective catalytic reaction of hydrogen with nitric oxide in the presence of oxygen
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Catalytic Reduction of Nitric Oxide with Carbon Monoxide. Effect of Oxygen
George L. Bauerle,Ken Nobe +1 more
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Selective catalytic reduction of NOx over acid-leached mordenite catalysts
TL;DR: In this paper, the authors studied selective catalytic reductions of NO, NO 2 and mixtures of NO and NO 2 over mordenite catalysts and found that the reduction of NO x revealed a maximal conversion at a NO 2 /NO x ratio of 0.5, indicating that the oxidation of NO or the decomposition of NO 2 are the rate limiting step in the overall reduction.