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NO represents an important group of pollutants that are formed in fuel combustion. As these pollutants cause significant environmental problems, removal of NO from exhaust gases is necessary. The present study investigated the influence of metal oxide powders on the removal of NO by oxidation with ozone. The aim of the study was to compare the catalytic effect of TiO, AlO and FeO and to investigate the dependence of the effective rate constant on temperature. 400 ppm of NO and a variable concentration of ozone in a mixture of N and O was directed through the catalyst chamber, heated to 60-140 °C. The addition of metal oxides resulted in a significant increase in the efficiency of the oxidation of NO to NO. FeO had the largest effect with a maximum of approximately three-fold increase in the effective rate constant at 100 °C. At the same time FeO had the lowest NO adsorption capacity. In case of all metal oxides, oxidation of NO to NO caused an abrupt increase in adsorption of NO.
This article was published in the following journal.
Name: Environmental science & technology
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A shift in the balance between production and destruction of STRATOSPHERIC OZONE that results in a decline of the amount of OZONE in the lower stratosphere.
Ozone in the Earth's stratosphere. It is produced continuously by the action of solar ULTRAVIOLET RAYS on oxygen in the stratosphere. The stratospheric ozone (especially at the ozone layer) blocks much of the solar UV radiation of wavelengths of 320 nanometers or less from being transmitted to lower ATMOSPHERE of the Earth.
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Neutral or negatively charged ligands bonded to metal cations or neutral atoms. The number of ligand atoms to which the metal center is directly bonded is the metal cation's coordination number, and this number is always greater than the regular valence or oxidation number of the metal. A coordination complex can be negative, neutral, or positively charged.
Nanoparticles produced from metals whose uses include biosensors, optics, and catalysts. In biomedical applications the particles frequently involve the noble metals, especially gold and silver.