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7697-37-2Relevant articles and documents
Formation and Decay of Peroxynitrous Acid: A Pulse Radiolysis Study
Loegager, T.,Sehested, K.
, p. 6664 - 6669 (1993)
Peroxynitrous acid and peroxynitrite anion have been studied using pulse radiolysis of nitrite and nitrate solutions.The formation rate constant determined to be k(OH + NO2) = (4.5 +/- 1.0) * 109 M-1 s-1, and the rate constant for the OH radical reaction with nitrite is determined to be k(OH +NO2-) = (6.0 +/- 1.0) * 109 M-1 s-1.In nitrate solutions, the competing reaction between OH and NO32- is found to have a rate constant of k(OH + NO32- = (3.0 +/- 1.0) * 109 M-1 s-1.The intermediate species in the nitrate system, NO32-, HNO3-, and H2NO3, decay into NO2 according to the first-order rate constants: (5.6 +/ - 0.5) * 104, (2.0 +/- 0.5) * 105, and (7.0 +/- 2.0) * 105 s-1, respectively.The rate constants k(H + NO3-) = (1.0 +/- 0.3) * 107 M-1 s-1 and k(H + NO2) = (1.0 +/- 0.2) * 1010 M-1 s-1 were also determined.The pKa of NOOH is found to be 6.5 +/- 0.1 by absorption measurements, and the maximum extinction coefficient at 240 nm is ε240(ONOOH) = 770 +/- 50 M-1 cm-1.The decay of peroxynitrous acid is detrmined to proceed through the first-order isomerization of ONOOH to HNO3 according to the rate equation kobs = kiso/(1 + Ka/+>) with rate constants kiso = 1.0 +/- 0.2 s-1 and Ka = (1.0 +/- 0.3) * 10-7.A comparison of all available literature values for the pKa and the decay rate is reported.
Visible light photocatalytic degradation of nitric oxides on PtOx-modified TiO2 via sol-gel and impregnation method
Huang, Chun-Hung,Wang, I-Kai,Lin, Yu-Ming,Tseng, Yao-Hsuan,Lu, Chun-Mei
, p. 163 - 170 (2010)
The visible light active catalysts, PtOx-doped TiO2 (PtOx-TiO2) and PtOx-loaded TiO2 (PtOx/TiO2), were successfully synthesized by the acid-catalyzed sol-gel process and the impregnation method. Pt(NH3)4(NO3)2 or H2Pt(OH)6 was employed as the PtOx precursor. By comparing the results of De-NOx, the modified photocatalysts exhibited a higher visible-light-responsive activity, and a lower NO2 selectivity than the unmodified ones. The FE-SEM images suggested that the particle size was unchanged after modification. The XRD patterns showed that the crystal structure still remained as anatase phase. Nitrogen adsorption revealed no significant change in surface areas for all samples. The UV-vis spectra indicated that PtOx promoted the absorption of visible light. Furthermore, the XPS spectra evidenced that the mixed valence states of PtO-PtO2 coexisted on the surface of TiO2. The adding of PtOx on TiO2 not only promoted the visible-light-responsive activity of converting NO to NO2 but also increased the consecutive reaction rate of NO2 to NO3-.
The inhibition of N2O5 hydrolysis in sulfuric acid by 1-butanol and 1-hexanol surfactant coatings
Park, Seong-Chan,Burden, Daniel K.,Nathanson, Gilbert M.
, p. 2921 - 2929 (2007)
Gas - liquid scattering experiments are used to measure the fraction of N2O5 molecules that are converted to HNO3 after colliding with 72 wt % H2SO4 containing 1-hexanol or 1-butanol at 216 K. These alcohols segregate to the surface of the acid, with saturation coverages estimated to be 60% of a close-packed monolayer for 1-hexanol and 44% of a close-packed monolayer for 1-butanol. We find that the alkyl films reduce the conversion of N2O5 to HNO 3 from 0.15 on bare acid to 0.06 on the hexyl-coated acid and to 0.10 on the butyl-coated acid. The entry of HC1 and HBr, however, is enhanced by the hexanol and butanol films. The hydrolysis of N2O5 may be inhibited because the alkyl chains restrict the transport of this large molecule and because the alcohol OH groups dilute the surface region, suppressing reaction between N2O5 and near-interfacial H 3O+ or H2O. In contrast, the interfacial alcohol OH groups provide additional binding sites for HC1 and HBr and help initiate ionization. These and previous scattering experiments indicate that short-chain alcohol surfactants impede or enhance sulfuric acid-mediated reactions in ways that depend on the chain length, liquid phase acidity, and nature of the gas molecule.
Photocatalytic activity of silicon-based nanoflakes for the decomposition of nitrogen monoxide
Itahara, Hiroshi,Wu, Xiaoyong,Imagawa, Haruo,Yin, Shu,Kojima, Kazunobu,Chichibu, Shigefusa F.,Sato, Tsugio
, p. 8643 - 8648 (2017)
The photocatalytic decomposition of nitrogen monoxide (NO) was achieved for the first time using Si-based nanomaterials. Nanocomposite powders composed of Si nanoflakes and metallic particles (Ni and Ni3Si) were synthesized using a simple one-pot reaction of layered CaSi2 and NiCl2. The synthesized nanocomposites have a wide optical absorption band from the visible to the ultraviolet. Under the assumption of a direct transition, the photoabsorption behavior is well described and an absorption edge of ca. 1.8 eV is indicated. Conventional Si and SiO powders with indirect absorption edges of 1.1 and 1.4 eV, respectively, exhibit considerably low photocatalytic activities for NO decomposition. In contrast, the synthesized nanocomposites exhibited photocatalytic activities under irradiation with light at wavelengths >290 nm (4.28 eV). The photocatalytic activities of the nanocomposites were confirmed to be constant and did not degrade with the light irradiation time.
An Upper Limit to the Rate of the HCl + ClONO2 Reaction
Molina, L. T.,Molina, M. J.,Stachnik, R. A.,Tom, R. D.
, p. 3779 - 3781 (1985)
The reaction HCl + ClONO2 -> Cl2 + HNO3 has been studied by FTIR spectroscopy and by a static wallless UV absorption technique.An upper limit to the homogeneous bimolecular rate constant of 1E-19 cm3 molecule-1 s-1 was established, making the reaction unimportant in the stratosphere.
Comparison of zinc oxide nanoparticles and its nano-crystalline particles on the photocatalytic degradation of methylene blue
Jang, Young Joon,Simer, Cynthia,Ohm, Taein
, p. 67 - 77 (2006)
Comparison of ZnO nanoparticles and its nano-crystalline particles on the photocatalytic degradation of methylene blue was investigated. ZnO nanoparticles and its nano-crystalline particles were synthesized from sprayed droplets of an aqueous zinc nitrate solution by flame spray pyrolysis and spray pyrolysis assisted with an electrical furnace, respectively. ZnO nanoparticles of 20 nm in average diameter and ZnO nano-crystalline particles of 20 nm in the grain size were prepared to compare the photocatalytic activity. The photocatalytic activity of those ZnO particles was evaluated by measuring the degradation of methylene blue in water under the illumination of ultraviolet rays. Effect of the particle morphology, initial concentration of methylene blue, and photocatalyst loading on the degradation of the methylene blue was investigated under the illumination of ultraviolet rays. The photocatalytic degradation capacity of the ZnO nanoparticles was higher than that of the ZnO nano-crystalline particles. The efficiency of photocatalytic degradation of methylene blue increased with increase in photocatalyst loading and decrease in initial concentration regardless of particle morphology.
Water vapor effect on the HNO3 yield in the HO2 + NO reaction: Experimental and theoretical evidence
Butkovskaya, Nadezhda,Rayez, Marie-Therese,Rayez, Jean-Claude,Kukui, Alexandre,Le Bras, Georges
, p. 11327 - 11342 (2009)
The influence of water vapor on the production of nitric acid in the gas-phase HO2 + NO reaction was determined at 298 K and 200 Torr using a high-pressure turbulent flow reactor coupled with a chemical ionization mass spectrometer. The yield o
Molecular Complexes of Nitric Acid with N2, CO and NO studied by Matrix Isolation IR Spectroscopy
Barnes, Austin J.,Lasson, Emilie,Nielsen, Claus J.
, p. 3111 - 3116 (1995)
The interaction of nitric acid with dinitrogen, carbon monoxide and nitric oxide has been investigated by IR spectroscopy in low-temperature argon matrices.The spectra show that under these conditions N2 interacts strongly and specifically with HNO3, forming several distinct 1 : 1 complexes.The probable structures of these complexes are discussed.CO behaves in a similar manner to N2, forming complexes of the type -ONO2; weak bands due to a -ONO2 complex were generated by photolysis.For NO, complexes of HNO3 were observed with both monomeric and dimeric NO.The strength of interaction with HNO3 was found to increase in the order N2 NO CO.
Ferric microperoxidase-11 catalyzes peroxynitrite isomerization
Ascenzi, Paolo,Leboffe, Loris,Santucci, Roberto,Coletta, Massimo
, p. 56 - 61 (2015)
Microperoxidase-11 (MP11) is an undecapeptide derived from horse heart cytochrome c offering the possibility to study the reactivity of the heme group relatively unshielded by the protein. Here, the peroxynitrite isomerization to NO3-/sup
Exploration of the Mechanism of the Activation of ClONO2 by HCl in Small Water Clusters Using Electronic Structure Methods
McNamara, Jonathan P.,Tresadern, Gary,Hillier, Ian H.
, p. 4030 - 4044 (2000)
High-level electronic structure calculations were used to study the mechanism of the reaction of ClONO2 with HCl in neutral water clusters containing one to five solvating water molecules. For the reaction between molecular HCl and ClONO2, the barrier decreases from 42 kcal mol-1 (uncatalyzed) to essentially zero when catalyzed by only two water molecules, where the reaction products involve Cl2 and HONO2. The calculations thus predict that the gas-phase reaction may be important in the stratospheric reactivation of ClONO2. The reaction between ClONO2 and solvated H3O+Cl-, as on the polar stratospheric cloud (PSC) surface, was investigated with clusters involving up to seven water molecules. The ice-catalyzed reaction involves an ionic mechanism whereby charge transfer to ClONO2 from the attacking nucleophile leads to significant ionization along the Cl-ONO2 bond. The effect of the size of the first solvation shell of Cl- is addressed by our calculations. In a cluster containing three waters and a five-water cluster structurally related to hexagonal ice, ClONO2 reacts spontaneously with HCl to yield Cl2/HONO2 in the three-water reaction and Cl2/H3O+-NO3- in the five-water-catalyzed reaction. The calculations thus predict that the reaction of ClONO2 with HCl on PSC ice aerosols can proceed spontaneously via an ionic pathway.