Abstract
Zirconium phosphide (ZrP) powders were synthesized by elemental combination method via the direct reaction of zirconium powders with red phosphorus, and characterized by XRD, SEM, XPS, XRF, SAED and TEM measurements. The obtained ZrP powders were found to exhibit apparent activity in the ready eliminateion of nitric oxide (NO) via facile redox reactions, and the elimination dynamics was evaluated within the context of various important experimental parameters, such as reaction temperature and gas concentration. At a fixed amount of ZrP powders, an increasing amount of NO would be eliminated with increasing reaction temperature, and complete conversion of NO to N2 could be reached in the range of 700 to 800 °C. The addition of NH3 also facilitated NO elimination at a fixed reaction temperature. Furthermore, of the products of the elimination process, zirconia (ZrO2) powder is a kind of biocompatible material, red phosphorus can be used to produce safety matches, organophosphorous pesticide and phosphor bronze, and the produced N2 might be collected and used as a protective gas or be converted into liquid nitrogen for other purposes.
Highlights
Nitrogen oxides (NOx) are harmful gases that give rise to a variety of environmental problems, such as acid rain, photochemical smog, and ozone depletion, which threaten human health to a great extent[1,2,3]
Whereas Zirconium phosphide (ZrP) has been synthesized by a variety of methods in the past decades, such as the reactions of zirconium metal with red phosphorus[32,33], zirconium or zirconium tetrachloride with Ca3P220, zirconium with PH333, or sodium co-reduction of ZrCl4 and PCl334, there are few reports on the chemical properties of ZrP and, up to date, there is no study of the activity of ZrP towards nitric oxide (NO) elimination
The results showed that the efficiency of NO elimination by ZrP increased with increasing temperature
Summary
Nitrogen oxides (NOx) are harmful gases that give rise to a variety of environmental problems, such as acid rain, photochemical smog, and ozone depletion, which threaten human health to a great extent[1,2,3]. Whereas ZrP has been synthesized by a variety of methods in the past decades, such as the reactions of zirconium metal with red phosphorus (elemental combination method)[32,33], zirconium or zirconium tetrachloride with Ca3P220, zirconium with PH333, or sodium co-reduction of ZrCl4 and PCl334, there are few reports on the chemical properties of ZrP and, up to date, there is no study of the activity of ZrP towards NO elimination. As for the products of the elimination reaction, ZrO2 powders can be used as a biocompatible material[35,36] and catalysts/catalyst support, red phosphorus can be used to produce safety matches and organophosphorous pesticide, and the produced N2 may be collected and used as a protective gas or be converted into liquid nitrogen for other purposes. The elimination process was of high efficiency and all reaction products could be used for other purposes
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