scholarly journals BaTi0.8B0.2O3 (B = Mn, Fe, Co, Cu) LNT Catalysts: Effect of Partial Ti Substitution on NOx Storage Capacity

Catalysts ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 365
Author(s):  
Craig Aldridge ◽  
Verónica Torregrosa-Rivero ◽  
Vicente Albaladejo-Fuentes ◽  
María-Salvadora Sánchez-Adsuar ◽  
María-José Illán-Gómez
Keyword(s):  
Storage Capacity ◽  
Sol Gel ◽  
Aqueous Media ◽  
Active Phase ◽  
Nox Storage ◽  
Partial Substitution ◽  
Lean Nox Trap ◽  
Highly Active ◽  
Nox Storage Capacity ◽  
Ti Substitution

The effect of partial Ti substitution by Mn, Fe, Co, or Cu on the NOx storage capacity (NSC) of a BaTi0.8B0.2O3 lean NOx trap (LNT) catalyst has been analyzed. The BaTi0.8B0.2O3 catalysts were prepared using the Pechini’s sol–gel method for aqueous media. The characterization of the catalysts (BET, ICP-OES, XRD and XPS) reveals that: i) the partial substitution of Ti by Mn, Co, or Fe changes the perovskite structure from tetragonal to cubic, whilst Cu distorts the raw tetragonal structure and promotes the segregation of Ba2TiO4 (which is an active phase for NOx storage) as a minority phase and ii) the amount of oxygen vacancies increases after partial Ti substitution, with the BaTi0.8Cu0.2O3 catalyst featuring the largest amount. The BaTi0.8Cu0.2O3 catalyst shows the highest NSC at 400 °C, based on NOx storage cyclic tests, which is within the range of highly active noble metal-based catalysts.

scholarly journals Improved NOx Storage/Release Properties of Ceria-Based Lean NOx Trap Compositions with MnOx Modification

Materials ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2127 ◽  
Author(s):  
Marcos Schöneborn ◽  
Thomas Harmening ◽  
Javier Giménez-Mañogil ◽  
Juan Carlos Martínez-Munuera ◽  
Avelina García-García
Keyword(s):  
Storage Capacity ◽  
Nox Storage ◽  
Pt Catalyst ◽  
Lean Nox Trap ◽  
Incipient Wetness Impregnation ◽  
Nox Trap ◽  
Remarkable Effect ◽  
Nox Storage Capacity ◽  
Nox Adsorption ◽  
Lean Nox

Ceria/spinel-based lean NOx trap compositions with and without barium were modified with MnOx via incipient wetness impregnation. The effect of the MnOx layer on the aged materials (850 °C) as to the NOx storage and release properties was investigated via NOx adsorption (500 ppm NO/5% O2/balance N2) carried out at 300 °C in a dual-bed with a 1% Pt/Al2O3 catalyst placed upstream of the samples to generate sufficient amounts of NO2 required for efficient NOx storage. Subsequent temperature programmed desorption (TPD) experiments were carried out under N2 from 300 °C to 700 °C. The addition of MnOx to the barium free composition led to a slightly reduced NOx storage capacity but all of the ad-NOx species were released from this material at significantly lower temperatures (ΔT ≈ 100 °C). The formation of a MnOx layer between ceria/spinel and barium had a remarkable effect on ageing stability as the formation of BaAl2O4 was suppressed in favour of BaMnO3. The presence of this phase resulted in an increased NOx storage capacity and lower desorption temperatures. Furthermore, NOx adsorption experiments carried out in absence of the Pt-catalyst also revealed an unexpected high NOx storage ability at low NO2/NO ratios, which could make this composition suitable for various lean NOx trap catalysts (LNT) related applications.

The Effects of Aging Temperature and Air-Fuel Ratio on the NOx Storage Capacity of a Lean NOx Trap

2004 ◽  
Author(s):  
Joseph R. Theis ◽  
Justin A. Ura ◽  
George W. Graham ◽  
Hung-Wen Jen ◽  
John J. Li ◽  
...  
Keyword(s):  
Aging Temperature ◽  
Storage Capacity ◽  
Nox Storage ◽  
Lean Nox Trap ◽  
Nox Trap ◽  
Fuel Ratio ◽  
Nox Storage Capacity ◽  
Lean Nox ◽  
Effects Of Aging

The Effects of Aging Temperature and PGM Loading on the NOx Storage Capacity of a Lean NOx Trap

2005 ◽  
Author(s):  
Joseph R. Theis ◽  
Justin A. Ura ◽  
Christian T. Goralski ◽  
Jon Caine ◽  
Marcus Davies ◽  
...  
Keyword(s):  
Aging Temperature ◽  
Storage Capacity ◽  
Nox Storage ◽  
Lean Nox Trap ◽  
Nox Trap ◽  
Nox Storage Capacity ◽  
Lean Nox ◽  
Effects Of Aging

scholarly journals BaTi1−xCuxO3 perovskites: The effect of copper content in the properties and in the NOx storage capacity

2014 ◽  
Vol 488 ◽  
pp. 189-199 ◽  
Author(s):  
Vicente Albaladejo-Fuentes ◽  
Franz Edwin López-Suárez ◽  
María Salvadora Sánchez-Adsuar ◽  
María José Illán-Gómez
Keyword(s):  
Copper Content ◽  
Storage Capacity ◽  
Nox Storage ◽  
Nox Storage Capacity ◽  
Effect Of Copper

scholarly journals NOx storage capacity, SO2 resistance and regeneration of Pt/(Ba)/CeZr model catalysts for NOx-trap system

2007 ◽  
Vol 42-43 (1-4) ◽  
pp. 9-13 ◽  
Author(s):  
E. C. Corbos ◽  
S. Elbouazzaoui ◽  
X. Courtois ◽  
N. Bion ◽  
P. Marecot ◽  
...  
Keyword(s):  
Storage Capacity ◽  
Model Catalysts ◽  
Nox Storage ◽  
Nox Trap ◽  
Trap System ◽  
Nox Storage Capacity ◽  
So2 Resistance

scholarly journals High Performance of Mn-Doped MgAlOx Mixed Oxides for Low Temperature NOx Storage and Release

Catalysts ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 677 ◽  
Author(s):  
Cui ◽  
Ma ◽  
Wang ◽  
Liu ◽  
Liu ◽  
...  
Keyword(s):  
Low Temperature ◽  
High Performance ◽  
Storage Capacity ◽  
Mixed Oxides ◽  
Nox Storage ◽  
X Ray ◽  
Temperature Range ◽  
Nox Storage Capacity ◽  
Nox Adsorption ◽  
Mn Doped

NOx storage-reduction (NSR) is a potential approach for the effective removal of NOx under the lean conditions in lean-burn engines. Herein, manganese-doped mixed oxides (Mn/MgAlOx) with high performance for low temperature NOx storage and release were derived from hydrotalcites precursors prepared by a facile coprecipitation method. The catalysts were characterized by X-ray diffraction (XRD), SEM, N2 adsorption-desorption, H2-TPR, FT-IR, and X-ray photoelectron spectroscopy (XPS) techniques. The Mn-doped MgAlOx catalysts exhibited high NOx storage capacity (NSC) at low temperature range (150–300 °C), which was related to their increased surface area, improved reducibility and higher surface Mn3+ content. The largest NSC measured, 426 μmol/g, was observed for NOx adsorption at 200 °C on Mn15 catalyst (the sample containing 15 wt% of Mn). The in situ DRIFTS spectra of NOx adsorption proved that the Mn-doped hydrotalcite catalysts are preferred for low temperature NOx storage and release due to their ability to store NOx mainly in the form of thermally labile nitrites. NSR cycling tests revealed the NOx removal rate of Mn15 sample can reach above 70% within the wide temperature range of 150–250 °C. Besides, the influence of CO2, soot, H2O and SO2 on NOx storage performance of Mn15 catalyst was also studied. In all, owning to their excellent NOx storage capacity, NSR cycling performance, and resistance to CO2, soot, SO2 and H2O, the Mn-doped MgAlOx NSR catalysts have broad application prospects in NOx control at low temperatures.

scholarly journals Trade-off between NOx storage capacity and sulfur tolerance on Al2O3/ZrO2/TiO2–based DeNOx catalysts

2019 ◽  
Vol 320 ◽  
pp. 152-164 ◽  
Author(s):  
Zafer Say ◽  
Oana Mihai ◽  
Merve Kurt ◽  
Louise Olsson ◽  
Emrah Ozensoy
Keyword(s):  
Storage Capacity ◽  
Nox Storage ◽  
Sulfur Tolerance ◽  
Trade Off ◽  
Nox Storage Capacity ◽  
Denox Catalysts

Transient behaviour of catalytic monolith with NOx storage capacity

2007 ◽  
Vol 119 (1-4) ◽  
pp. 64-72 ◽  
Author(s):  
Petr Kočí ◽  
Matyáš Schejbal ◽  
Jan Trdlička ◽  
Tomáš Gregor ◽  
Milan Kubíček ◽  
...  
Keyword(s):  
Storage Capacity ◽  
Nox Storage ◽  
Transient Behaviour ◽  
Nox Storage Capacity
Sign in / Sign up

Export Citation Format

Share Document