Synthesis and Characterization of Fe²⁺ Ion-Exchanged TiO₂ Materials and Their Supported V₂O₅ Catalysts for a Great Depression of the Formation of N₂O in the Selective Reduction of NO by NH₃

Abstract

Fe-exchanged TiO 2 substances ("FeTn") were synthesized by subliming a solid mixture of a surface-hydroxylated TiO 2 ("HT") with a salt of iron(II) chloride at 200−400 °C to utilize them as supports for dramatically decreasing the formation of N 2 O in the reduction of NO by NH 3 over supported V 2 O 5 catalysts. All the FeTns did not undergo the incorporation of Fe cations into the lattice of the HT, the structural transformation, or the formation of any oxygen-containing iron complexes. Unique bands near 2286 cm −1 by η 1 -N 2 O adsorbed on the FeTns disclosed the presence of the Fe as isolated Fe 2+ cations, consistent with their Fe 2p 3/2 main and satellite structures. All FeTn-supported V 2 O 5 systems exhibited a noticeable decrease in N 2 O production at temperatures ≥350 °C, by 70−80%, compared to that over an HTsupported V 2 O 5 . Thus, such FeTns bode well for use as supports of V 2 O 5 in deNO x catalysis.

Depicting the Nitric Oxide (NO) Chemical Sorption in Lithium Cuprate (Li2CuO2), through Thermokinetic and Spectroscopic Analyses

“…18,19 Specifically, nitrogen oxide (NO), a colorless toxic gas, has been captured using ionic liquids and deep eutectic liquids, 20,21 as well as several types of metal oxides (CaO, MnO, NiO, SrO, BaO, TiO 2 and SnO 2 , among others) and zeolites, by a selective catalytic reduction. 22 This article is licensed under CC-BY 4 On the other hand, according to literature, lithium cuprate (Li 2 CuO 2 ) is an important ceramic used frequently as a cathode of rechargeable lithium batteries. 23 Lithium cuprate has been used in this application due to its magnetic and electronic properties, which can be described based on its crystal structure, where CuO 2 layers are stacked along the caxis and these layers interact with each other through LiO 2 sheets located between CuO 4 square planar units.…”

“…In order to confront this environmental challenge, different scientific and technological approaches have been proposed for the elimination of these nitrogen oxides. For example, the selective catalytic reduction and the capture of NO x − have been explored using different types of solid adsorbent materials, such as zeolites, ,− metal oxides, , activated carbon materials , and metal–organic frameworks (MOFs). , Specifically, nitrogen oxide (NO), a colorless toxic gas, has been captured using ionic liquids and deep eutectic liquids, , as well as several types of metal oxides (CaO, MnO, NiO, SrO, BaO, TiO 2 and SnO 2 , among others) and zeolites, by a selective catalytic reduction …”