Thermally Durable Vanadium-SCR Catalysts for Diesel Applications

Maunula, Teuvo; Kinnunen, Toni; Kanniainen, Kauko; Viitanen, Arto; Savimäki, A.

doi:10.4271/2013-01-1063

Cited by 21 publications

(17 citation statements)

References 10 publications

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“…Madia et al 9 performed progressive aging experiments for 100 h at 550 °C and 30 h at 600 °C and found that 2 wt % V 2 O 5 had the best hydrothermal stability. Maunula et al 16 deactivated the catalyst using 10% H 2 O at 600, 650, 700, 750, and 800 °C for 20 h, and aged coated samples in static furnace conditions at 600, 650, 700, and 800 °C for 3 h. Li et al 17 aged SCR catalysts at 670 °C for 64 h. Beale et al 18 tested the catalyst at 650 and 700 °C for 20 h in a flow of 10% H 2 O.…”

Section: Introductionmentioning

confidence: 99%

New Findings in Hydrothermal Deactivation Research on the Vanadia-Selective Catalytic Reduction Catalyst

Yao

et al. 2019

ACS Omega

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Considering the risks of hydrothermal deterioration in vehicles, power plants, and oceangoing vessels, V 2 O 5 -WO 3 /TiO 2 catalysts were subject to hydrothermal and thermal aging at 600, 625, 635, and 650 °C for 4–48 h. The different ratio and significant loss of active sites are main reasons for catalyst deactivation. Both Lewis and Brønsted acid sites are involved in the selective catalytic reduction reaction. Brønsted acid sites are more susceptible. High temperature plays a major role in the aging. It causes sintering, particle growth, and the anatase phase transition. Phase transformation turns out to be less important than sintering. Sintering leads to the reduction of the BET surface area, which in turn causes decrease of NH 3 adsorption amount and changes of active sites. Aging time can accelerate the degree of deactivation. It also helps to change the proportion of active sites. Water vapor has no significant effect on NO X conversion rates.

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Section: Introductionmentioning

confidence: 99%

New Findings in Hydrothermal Deactivation Research on the Vanadia-Selective Catalytic Reduction Catalyst

Yao

et al. 2019

ACS Omega

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“…Presently, the current technology for automotive exhaust pollution control consists in combining a Diesel Oxidation Catalyst (DOC), which catalyzes the oxidation of NO to NO 2 , a Diesel Particulate Filter (DPF) and a SCR‐catalyst complying with the Euro VI and US Tier 4 standard regulations for heavy‐duty vehicles . The SCR occurs more readily at optimal ratio NO/NO 2 =1 according to Eq.…”

Section: General Introduction and Contextmentioning

confidence: 99%

What News in the Surface Chemistry of Bulk and Supported Vanadia Based SCR‐Catalysts: Improvements in their Resistance to Poisoning and Thermal Sintering

Granger

Siaka

Umbarkar

2018

The Chemical Record

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This paper reports a short review on the impact of poisoning effects and thermal aging on the reactivity of surface vanadate species on benchmark V2O5−WO3/TiO2 Selective‐Catalytic‐Reduction catalysts. A renewed interest of this SCR technology is related to its diversification notably as after‐treatment systems to treat the exhaust from Diesel engines with higher running temperature especially when SCR catalysts are coated on Diesel Particulates Filters. Particular attention is also paid to poisoning effects in conjunction with the progressive replacement of fossil fuels by bio‐fuels containing alkaline contaminants which drastically deactivate the catalyst through neutralization of strong acid sites. Most of the investigations show that better insight into the mechanisms of poisoning and aging processes is needed especially to understand the relative sensibility of various vanadate species. This could provide original guidelines to catalyst preparation and or the developments of more stable bulk systems as exemplified.

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“…There are: applying the internal engine methods (e.g. exhaust gas recirculation systems, modern combustion systems) or by use of engine external methods like exhaust aftertreatment systems [6][7][8][9]. It is possible to apply external exhaust gas recirculation systems (low and high pressure) and internal exhaust gas recirculation.…”

Section: Introduction and Motivation For The Researchmentioning

confidence: 99%

“…To these may include homogeneous combustion systems (HCCI -Homogeneous Charge Compression Ignition) or low temperature combustion (LTC -Low Temperature Combustion). It is also possible to use exhaust aftertreatment systems containing DOC (Diesel Oxidation Catalyst), DPF (Diesel Particle Filter), SCR (Selective Catalytic Reduction), or a combination thereof [6][7][8][9].…”

Section: Introduction and Motivation For The Researchmentioning

confidence: 99%

Examination of the influence of multi-injection strategy on thermodynamic indexes of engine cycle and on the emission of toxic compounds

et al. 2014

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The main target of this work was to investigate on the 1-cyl. research engine concerning practical realization possibilities of cold-flame-combustion when operating with high and very high Exhaust Gas Recirculation (EGR) rates. After determining of possibilities of lowering NOx and Soot emissions for EGR rates ca. 40-60% some further investigation on optimization of SOI and CoC parameters were performed. Additionally, some preliminary investigations of the optimization of combustion parameters when applying various strategies of multi-injection have been conducted and analyzed.

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Thermally Durable Vanadium-SCR Catalysts for Diesel Applications

Cited by 21 publications

References 10 publications

New Findings in Hydrothermal Deactivation Research on the Vanadia-Selective Catalytic Reduction Catalyst

New Findings in Hydrothermal Deactivation Research on the Vanadia-Selective Catalytic Reduction Catalyst

What News in the Surface Chemistry of Bulk and Supported Vanadia Based SCR‐Catalysts: Improvements in their Resistance to Poisoning and Thermal Sintering

Examination of the influence of multi-injection strategy on thermodynamic indexes of engine cycle and on the emission of toxic compounds

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