Reversible Sorption of Nitrogen Oxides in Mn–Zr Oxide

Selective Adsorption of NOxfrom Hot Combustion Gases by Ce-Doped CuO/TiO2

“…12,13 The more promising sorbents have been supported transition metal oxides, [14][15][16][17][18] Cu 2+ and other cations, 19 Fe 2 O 3 dispersed on activated carbon fibers, 20,21 zeolites, 22,23 Y-Ba-Cu-O, 24,25 mixed metal oxides, 11a,b,26,27 and carbon. 28 The most promising sorbent, in terms of NO x capacity and rate of uptake, appears to be Mn-Zr (1:1 molar ratio) mixed oxides, reported recently by Eguchi et al 27 In this work, we report sorbent characteristics of the new sorbents CuO/TiO 2 and Ce-CuO/TiO 2 and show that this sorbent is superior to the Mn-Zr oxides by a direct comparison.…”

“…The predominant species was NO 3on metal oxides, particularly on oxides of base metals. 27 Oxidation of NO is involved in the chemisorption of NO in the presence of O 2 ; in fact, O 2 enhances the sorption of NO x . 11a,b,27 However, it is also known that CeO 2 alone does not chemisorb NO at elevated temperatures.…”

“…Comparison of CeO 2 -CuO/TiO 2 with MnO/ZrO 2 . The most promising NO x sorbent reported in the literature was that of Eguchi et al 27 It was reported that MnO/Z x O 2 (1:1 molar ratio) had a high sorption rate and capacity for NO x at 200 °C, 900-1000 ppm of NO in 10% O 2 . To make a direct comparison with their sorbent, the CeO 2 -CuO/TiO 2 was subjected to the same sorption conditions, i.e., 1000 ppm of NO and 200 °C.…”

Reversible NOx storage over Ru/Na–Y zeolite

“…S3 †). 12,43,44 Ru(3%)/Na-Y adsorbent after pretreatment at 450 C for 1 h under 5% O 2 and 3% H 2 O was characterized using powder X-ray diffraction in sealed capillaries. In addition to the diffraction pattern of Na-Y zeolite, a crystalline anhydrous RuO 2 phase with characteristic diffraction peaks at 28.4, 35.3 and 54.4 2q was detected.…”

A short review about NOx storage-reduction catalysts based on metal oxides and hydrotalcite-type anionic clays

“…For example, the oxidative NO adsorption onto MnO x -ZrO 2 at temperature below 200 C was reported by Eguchi et al (1996), who showed that the amount of stored NO was the largest for the sample with the Mn/Zr ratio of 1 (0.133 mol/mol-Zr at 200 C). Due to weaker basicity, the thermal desorption of NO x took place at (Centi et al, 2003;Fornasari et al, 2002;Yu et al, 2007a (Yu et al, 2007a).…”