scholarly journals SO2 deactivation mechanism of NO oxidation and regeneration of the LaCoO3 perovskite

2020 ◽  
Vol 10 (7) ◽  
pp. 2193-2202 ◽  
Author(s):  
Ferenc Martinovic ◽  
Quang Nguyen Tran ◽  
Fabio Alessandro Deorsola ◽  
Samir Bensaid ◽  
Regina Palkovits ◽  
...  
Keyword(s):  
No Oxidation ◽  
Oxidation Catalyst ◽  
So2 Deactivation ◽  
Deactivation Mechanism

The deactivation mechanism and methods to cope with the poisoning by SO2 of a LaCoO3 perovskite-based NO oxidation catalyst were investigated.

scholarly journals Identification of Ru/Ceria Among Single Atom Ceria Catalysts as a Stable and Superior Material for Abatement of Diesel and Gasoline Engine Pollutants

2020 ◽  
Author(s):  
Konstantin Khivantsev ◽  
Nicholas R. Jaegers ◽  
Libor Kovarik ◽  
Jinshu Tian ◽  
Xavier Isidro Pereira Hernandez ◽  
...  
Keyword(s):  
Gasoline Engine ◽  
No Oxidation ◽  
Oxidation Catalyst ◽  
Single Atom ◽  
Hydrothermal Aging ◽  
Gasoline Engines ◽  
Nox Adsorption ◽  
Ceria Catalysts ◽  
Better Than ◽  
Three Way Catalysis

Atomically dispersed transition metals (Ru, Pd and Pt) have been prepared on CeO<sub>2</sub> and evaluated for NOx/CO abatement applications for diesel and gasoline engines, such as low temperature passive NOx adsorption (PNA), NO and CO oxidation, and three-way-catalysis (TWC). 0.5 wt% Ru/CeO<sub>2</sub> catalyst (Ru is ~27 and ~7 times cheaper than Rh and Pd) shows remarkable PNA performance, better than 1 wt% Pd/Zeolite: it achieves 100% removal of NOx during vehicle cold start. FTIR measurements reveal the formation of stable Ru(NO) complexes as well spill-over of NO to CeO<sub>2</sub> surface via the Ru-O-Ce shuttle, explaining high NO storage. Notably, Ru/ceria survives hydrothermal aging at 750 ⁰C without loss of PNA capacity. It is also a robust NO oxidation catalyst, considerably more active than Pt or Pd/CeO<sub>2</sub>. Expanding the repertoire of Ru/CeO<sub>2</sub> catalytic applications, we further find 0.1 and 0.5 wt% Ru/CeO<sub>2</sub> to be excellent TWC catalysts, rivaling best single-atom Rh supported materials. Our study pushes the frontier of precious metal atom economy for environmental catalysis from uber expensive Rh/Pd/Pt to more sustainable cheaper Ru and highlights the utility of single-atom catalysts for industrially relevant applications.

The inhibition effect and deactivation mechanism of H2O and SO2 on selective catalytic oxidation of NO over the Mn–Ca–Ox–(CO3)y catalyst

2019 ◽  
Vol 43 (48) ◽  
pp. 19279-19285 ◽  
Author(s):  
Chi Wang ◽  
Ruiyuan Zhang ◽  
Yishan Zhang ◽  
Ping Ning ◽  
Xin Song ◽  
...  
Keyword(s):  
Particle Size ◽  
Catalytic Oxidation ◽  
No Oxidation ◽  
Inhibition Effect ◽  
Selective Catalytic Oxidation ◽  
Oxidation Of No ◽  
Deactivation Mechanism

H2O and SO2 had an inhibition effect on NO oxidation. SO2 increased the particle size of the catalyst. H2O decreased the particle size of the catalyst.

H2O and SO2 deactivation mechanism of MnOx/MWCNTs for low-temperature SCR of NOx with NH3

2013 ◽  
Vol 377 ◽  
pp. 154-161 ◽  
Author(s):  
Siwei Pan ◽  
Hongcheng Luo ◽  
Li Li ◽  
Zhengle Wei ◽  
Bichun Huang
Keyword(s):  
Low Temperature ◽  
So2 Deactivation ◽  
Low Temperature Scr ◽  
Scr Of Nox ◽  
Deactivation Mechanism

scholarly journals Evaluation of NO Oxidation Properties over a Mn-Ce/γ-Al2O3Catalyst

2016 ◽  
Vol 2016 ◽  
pp. 1-5
Author(s):  
Pan Wang ◽  
Peng Luo ◽  
Junchen Yin ◽  
Lili Lei
Keyword(s):  
Electron Microscope ◽  
Sol Gel ◽  
Diesel Oxidation Catalyst ◽  
No Oxidation ◽  
Oxidation Catalyst ◽  
X Ray Diffraction ◽  
Oxidation Activity ◽  
Transmission Electron ◽  
Diesel Oxidation ◽  
Oxidation Properties

With the purpose of studying the effect of diesel oxidation catalyst (DOC) on the NO oxidation activity, a series ofxMn10Ce/γ-Al2O3(x= 4, 6, 8, and 10) catalysts were synthesized by acid-aided sol-gel method. The physicochemical properties of the catalysts were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and Transmission Electron Microscope (TEM). Result showed that the crystalline size of MnOxand CeO2ranges from 5 nm to 30 nm and manganese existed mainly in the catalysts in the form of manganese dioxide. Moreover, NO oxidation experiments were carried out to evaluate the activity of the catalysts; according to the results, 6Mn10Ce/γ-Al2O3catalyst showed the supreme NO oxidation activity with a NO to NO2conversion rate of 83.5% at 300°C. Compared to 500 ppm NO inlet concentration, the NO conversion was higher than that of 750 and 1000 ppm NO over 6Mn10Ce/γ-Al2O3catalyst in the temperature range of 150–300°C.

Evaluation of H2 effect on NO oxidation over a diesel oxidation catalyst

2015 ◽  
Vol 179 ◽  
pp. 542-550 ◽  
Author(s):  
Muhammad Mufti Azis ◽  
Xavier Auvray ◽  
Louise Olsson ◽  
Derek Creaser
Keyword(s):  
Diesel Oxidation Catalyst ◽  
No Oxidation ◽  
Oxidation Catalyst ◽  
Diesel Oxidation ◽  
H2 Effect

scholarly journals Low-temperature SCR activity and SO2 deactivation mechanism of Ce-modified V2O5–WO3/TiO2 catalyst

2015 ◽  
Vol 25 (4) ◽  
pp. 342-352 ◽  
Author(s):  
Ziran Ma ◽  
Xiaodong Wu ◽  
Ya Feng ◽  
Zhichun Si ◽  
Duan Weng ◽  
...  
Keyword(s):  
Low Temperature ◽  
Tio2 Catalyst ◽  
So2 Deactivation ◽  
Low Temperature Scr ◽  
Deactivation Mechanism

The impact of CO and C3H6 pulses on PtO reduction and NO oxidation in a diesel oxidation catalyst

2016 ◽  
Vol 181 ◽  
pp. 644-650 ◽  
Author(s):  
Adéla Arvajová ◽  
Petr Kočí ◽  
Volker Schmeißer ◽  
Michel Weibel
Keyword(s):  
Diesel Oxidation Catalyst ◽  
No Oxidation ◽  
Oxidation Catalyst ◽  
Diesel Oxidation ◽  
The Impact

scholarly journals Kinetic Modeling of C3H6 Inhibition on NO Oxidation over Pt Catalyst

2016 ◽  
Vol 11 (1) ◽  
pp. 27
Author(s):  
Muhammad Mufti Azis ◽  
Derek Creaser
Keyword(s):  
Low Temperature ◽  
Kinetic Modeling ◽  
Diesel Oxidation Catalyst ◽  
No Oxidation ◽  
Oxidation Catalyst ◽  
Pt Catalyst ◽  
Lean Burn ◽  
Microkinetic Model ◽  
Langmuir Hinshelwood Mechanism ◽  
Temperature Programmed Reaction

<p>Exhaust after treatment for lean burn and diesel engine is a complex catalytic system that consists of a number of catalytic units. Pt/Al<sub>2</sub>O<sub>3</sub> is often used as a model Diesel Oxidation Catalyst (DOC) that plays an important role to facilitate oxidation of NO to NO<sub>2</sub>. In the present study, we proposed a detailed kinetic model of NO oxidation as well as low temperature C<sub>3</sub>H<sub>6</sub> inhibition to simulate temperature-programmed reaction (TPR) data for NO oxidation over Pt/Al<sub>2</sub>O<sub>3</sub>. A steady-state microkinetic model based on Langmuir-Hinshelwood mechanism for NO oxidation was proposed. In addition, low temperature C<sub>3</sub>H<sub>6</sub> inhibition was proposed as a result of site blocking as well as surface nitrite consumption. The model can explain the experimental data well over the studied temperature range. Copyright © 2016 BCREC GROUP. All rights reserved</p><p><em>Received: 10<sup>th</sup> November 2015; Revised: 1<sup>st</sup> February 2016; Accepted: 1<sup>st</sup> February 2016</em></p><p><strong>How to Cite</strong>: Azis, M.M., Creaser, D. (2016). Kinetic Modeling of C<sub>3</sub>H<sub>6</sub> Inhibition on NO Oxidation over Pt Catalyst. <em>Bulletin of Chemical Reaction Engineering &amp; Catalysis</em>, 11 (1): 27-33. (doi:10.9767/bcrec.11.1.403.27-33)</p><p><strong>Permalink/DOI</strong>: <a href="http://dx.doi.org/10.9767/bcrec.11.1.403.27-33">http://dx.doi.org/10.9767/bcrec.11.1.403.27-33</a></p>

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