Removal of Hydrocarbons and Particulate Matter Using a Vanadia Selective Catalytic Reduction Catalyst: An Experimental and Modeling Study

Watling, Timothy C.; Lopez, Yaritza; Pless, Jason D.; Sukumar, Balaji; Klink, Wassim; Markatou, Penelope

doi:10.4271/2013-01-1071

Cited by 21 publications

(22 citation statements)

References 19 publications

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“…3 (b). The partial oxidation of HCs over vanadia-based catalysts leads to a mixture of CO and CO2 instead of total oxidation, which has been previously reported also for commercial catalysts [26,29]. Accordingly, in the present study, the CO share was much higher than the CO2 concentration for both catalysts, which is in agreement with our previous results [29].…”

Section: Propylene Oxidationsupporting

confidence: 93%

“…This behavior is even more pronounced for the Mo-based catalyst, which shows a 100 °C shift for the onset of propylene oxidation. Hardly any inhibition of SCR on C3H6 oxidation was found above 400 °C for both catalysts, in agreement with previous literature studies [26,29]. Also in the presence of the SCR gas mixture formaldehyde emissions were recorded for both samples.…”

Section: Scr With Propylene Oxidationsupporting

confidence: 92%

“…In contrast to C3H6 oxidation, C12H26 conversion occurs at much lower temperatures in the absence of the SCR mixture. This is a result of chain length impact since HCs with longer chain length are easier oxidized [25,26]. This explains the substantial impact of dodecane presence on SCR activity, observed for both catalysts.…”

Section: Discussionmentioning

confidence: 89%

“…The oxidation activity of V2O5-based catalysts for carbonaceous species has been linked to the low oxygen bond strength of vanadia [25]. Watling et al [26] showed that up to 80% of propylene conversion is achieved at 550 °C on commercial vanadia based SCR catalysts, without a significant impact on the SCR performance. A similarly high SCR activity was observed by Bertole et al [18] in the presence of HCHO, CO, C2H4 and C2H6 over a V-based system that also included noble metals.…”

Section: Introductionmentioning

confidence: 99%

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Selective Catalytic Reduction of NOx with Ammonia and Hydrocarbon Oxidation Over V2O5–MoO3/TiO2 and V2O5–WO3/TiO2 SCR Catalysts

et al. 2018

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The NH3-SCR performance in the presence of short and long chain hydrocarbons (propylene and dodecane) as well as of formaldehyde was investigated for a series of V2O5-MoO3/TiO2 (VMoTi) and V2O5-WO3/TiO2 (VWTi) catalysts. The results demonstrate that vanadium oxides act as the main catalytically active component for NOx conversion, hydrocarbon (HC) and formaldehyde oxidation. Among VMoTi and VWTi materials with different vanadium loading, the catalysts containing 3 wt.% V2O5 lead to the highest catalytic activity. The ability to simultaneously remove NOx, HC and HCHO over VMoTi is inferior to that of the conventional WO3-based catalyst. However, VMoTi exhibits higher CO2 selectivity, especially during oxidation of long-chain HCs, which represents an important advantage for a possible multifunctional catalyst. Apart from CO, formaldehyde was detected as byproduct during HC oxidation for both catalyst formulations.

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Section: Propylene Oxidationsupporting

confidence: 93%

Section: Scr With Propylene Oxidationsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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Selective Catalytic Reduction of NOx with Ammonia and Hydrocarbon Oxidation Over V2O5–MoO3/TiO2 and V2O5–WO3/TiO2 SCR Catalysts

et al. 2018

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“…Whereas the DOC+SCR configuration consists of a DOC designed to oxidize hydrocarbons and SOF (Diehl et al 2010), the V-SCR does not. However, it has been previously reported that the combined oxidation capability of the V-SCR and AMOX catalysts enables this configuration to reduce hydrocarbons, including aromatics and PAHs (Jiang et al 2013;Ottinger et al 2014;Watling et al 2013;Liu et al 2015b). Watling et al have studied the ability of a V-SCR catalyst-without the additional AMOX catalyst utilized in this study-to convert THC, and the authors have reported up to 75% conversion, depending on engine operating conditions.…”

Section: Resultsmentioning

confidence: 99%

Gas-phase and semivolatile organic emissions from a modern nonroad diesel engine equipped with advanced aftertreatment

Liu

Eckerle

Ottinger

2018

Journal of the Air & Waste Management Association

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U.S. Tier 4 Final and Euro Stage IV and V regulations for nonroad compression-ignition engines have led to the development of exhaust aftertreatment technologies optimized for nonroad engines and duty cycles. In this study, several aftertreatment configurations consisting of state-of-the-art diesel oxidation catalysts (DOCs), diesel particulate filters (DPFs), copper (Cu) zeolite- and vanadium-based selective catalytic reduction (SCR) catalysts, and ammonia oxidation (AMOX) catalysts are evaluated using both nonroad transient (NRTC) and steady (8-mode NRSC) cycles in order to understand both component- and system-level effects of diesel aftertreatment on gas-phase, semivolatile, and particle-phase and particle-bound unregulated organic emissions. Organic emissions reported in this work include total hydrocarbon (THC), n-alkanes, branched alkanes, saturated cycloalkanes, aromatics, aldehydes, ketones, hopanes, steranes, and soluble organic fraction (SOF). Brake-specific emissions are reported for four configurations, including engine-out, DOC+CuZ-SCR+AMOX, V-SCR+AMOX, and DOC+DPF+CuZ-SCR+AMOX, and conversion of engine-out emissions is reported for the three aftertreatment configurations. Mechanisms responsible for the reduction of organic species are discussed in detail. This summary of emissions from a current nonroad diesel engine equipped with advanced aftertreatment can be used to more accurately model the impact of anthropogenic emissions on the atmosphere with tools such as the U.S. Environmental Protection Agency's Motor Vehicle Emissions Simulator (MOVES2014a) model. Implications: Anthropogenic emissions are a source of significant human health and environmental risk. This study, focused on the treatment of exhaust emissions from a modern nonroad diesel engine with a variety of aftertreatment configurations, examines the impact that human industrial activity can have on air pollution. In particular, we focus on the remediation of gas-phase and semivolatile organic emissions by emission reduction technologies. This detailed summary of emissions from a current nonroad diesel engine equipped with advanced aftertreatment can be used to more accurately model the impact of anthropogenic emissions on the atmosphere with tools such as the U.S. Environmental Protection Agency's MOVES2014a model.

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Hydrocarbon and Soot Oxidation over Cerium and Iron Doped Vanadium SCR Catalysts

et al. 2020

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V2O5−WO3/TiO2 (VWTi) catalysts are widely employed for selective catalytic reduction (SCR) of NOx. However, due to their poor thermal stability the application in diesel particulate filters (DPFs), i. e. 2‐way SCRonDPF is limited. In this study, the potential of Ce‐ and Fe‐doped VWTi systems for hydrocarbon and soot oxidation in addition to the SCR activity was systematically investigated for fresh and thermally aged samples. The formation of metal vanadates upon thermal aging, as identified by X‐ray diffraction, Raman and X‐ray adsorption spectroscopy, prevents drastic sintering of the support and maintains a high NOx−SCR and hydrocarbon oxidation activity. Additionally, the doped VWTi catalysts show a slight increase of the CO2 selectivity during hydrocarbon oxidation, which represents an important aspect for such multifunctional catalysts. Despite of the advantages, the formation of metal vanadates hinders the mobility of vanadium species and decreases the soot oxidation ability of the doped catalysts. Interestingly, a promising soot oxidation activity was identified for the VWTi−Fe sample after aging at 650 °C, which resulted in decomposition of the iron vanadate and generation of highly dispersed and mobile V2O5.

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Removal of Hydrocarbons and Particulate Matter Using a Vanadia Selective Catalytic Reduction Catalyst: An Experimental and Modeling Study

Cited by 21 publications

References 19 publications

Selective Catalytic Reduction of NOx with Ammonia and Hydrocarbon Oxidation Over V2O5–MoO3/TiO2 and V2O5–WO3/TiO2 SCR Catalysts

Selective Catalytic Reduction of NOx with Ammonia and Hydrocarbon Oxidation Over V2O5–MoO3/TiO2 and V2O5–WO3/TiO2 SCR Catalysts

Gas-phase and semivolatile organic emissions from a modern nonroad diesel engine equipped with advanced aftertreatment

Hydrocarbon and Soot Oxidation over Cerium and Iron Doped Vanadium SCR Catalysts

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