Aged DOC is a Net Consumer of NO2: Analyses of Vehicle, Engine-dynamometer and Reactor Data

Katare, Santhoji; Patterson, Joseph E.; Laing, Paul M.

doi:10.4271/2007-01-3984

Cited by 55 publications

(42 citation statements)

References 4 publications

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“…These results corroborate the findings of Katare and coauthors, 25 who found that aged DOCs are net consumers of NO 2 when exhaust temperature is relatively low and high concentrations of hydrocarbons and carbon monoxide are present in the exhaust, conditions similar to those observed for mode M1. The NO 2 was formed in DOCs at the higher exhaust temperatures under conditions similar to those observed for M2, at which hydrocarbons and carbon monoxide are oxidized.…”

Section: No Xsupporting

confidence: 82%

Aerosols Emitted in Underground Mine Air by Diesel Engine Fueled with Biodiesel

Bugarski

Cauda

Janisko

et al. 2010

Journal of the Air & Waste Management Association

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Using biodiesel in place of petroleum diesel is considered by several underground metal and nonmetal mine operators to be a viable strategy for reducing the exposure of miners to diesel particulate matter. This study was conducted in an underground experimental mine to evaluate the effects of soy methyl ester biodiesel on the concentrations and size distributions of diesel aerosols and nitric oxides in mine air. The objective was to compare the effects of neat and blended biodiesel fuels with those of ultralow sulfur petroleum diesel. The evaluation was performed using a mechanically controlled, naturally aspirated diesel engine equipped with a muffler and a diesel oxidation catalyst. The effects of biodiesel fuels on size distributions and number and total aerosol mass concentrations were found to be strongly dependent on engine operating conditions. When fueled with biodiesel fuels, the engine contributed less to elemental carbon concentrations for all engine operating modes and exhaust configurations. The substantial increases in number concentrations and fraction of organic carbon (OC) in total carbon over the baseline were observed when the engine was fueled with biodiesel fuels and operated at light-load operating conditions. Size distributions for all test conditions were found to be single modal and strongly affected by engine operating conditions, fuel type, and exhaust configuration. The peak and total number concentrations as well as median diameter decreased with an increase in the fraction of biodiesel in the fuels, particularly for highload operating conditions. The effects of the diesel oxidation catalyst, commonly deployed to counteract the potential increase in OC emissions due to use of biodiesel, were found to vary depending upon fuel formulation and engine operating conditions. The catalyst was relatively effective in reducing aerosol number and mass concentrations, particularly at light-load conditions, but also showed the potential for an increase in nitrogen dioxide concentrations at high-load modes. INTRODUCTION As of May 20, 2008, the U.S. Mine Safety and HealthAdministration (MSHA) regulation 1 limits exposures of underground metal and nonmetal miners to diesel particulate matter (DPM) to 160 g/m 3 of total carbon (TC). Improvements in mine ventilation and the curtailment of DPM and toxic gaseous emissions from existing and new diesel-powered equipment are commonly perceived as the most promising tools to meet MSHA technology forcing regulations. Although diesel particulate filter (DPF) systems are gradually becoming more utilized for controlling DPM emissions from underground mining vehicles, 2,3 their acceptance has been hindered by their relative complexity, implementation issues, and expense. Changing fuel supply from petroleum diesel to higherconcentration biodiesel blends is considered by several underground mine operators to be a viable alternative for controlling DPM emissions. The major advantages of biodiesel over petroleum-based diesel fuels with respect to DPM emissi...

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Section: No Xsupporting

confidence: 82%

Aerosols Emitted in Underground Mine Air by Diesel Engine Fueled with Biodiesel

Bugarski

Cauda

Janisko

et al. 2010

Journal of the Air & Waste Management Association

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“…In terms of NO, CO and HC oxidation over a Pt/Al 2 O 3 DOC, the oxidation reactions are mutually inhibited by one another due to competitive adsorption on the same active sites [3,4]. Furthermore, the reaction between product NO 2 and HC/CO is catalytically more favorable than that with O 2 , which results in little to no net NO 2 made in the presence of CO and HC [4,5]. Thus, NO 2 formation is only evident once most of the CO and HCs are oxidized.…”

Section: Introductionmentioning

confidence: 96%

“…Thus, NO 2 formation is only evident once most of the CO and HCs are oxidized. For example, due to decreased CO and HC oxidation ability, an aged DOC is reportedly a net consumer of NO 2 [5].…”

Section: Introductionmentioning

confidence: 99%

NO Oxidation Inhibition by Hydrocarbons over a Diesel Oxidation Catalyst: Reaction Between Surface Nitrates and Hydrocarbons

Luo

Epling

2011

Catal Lett

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“…Considering NO 2 , it appears alternatively decreased and increased over the DOC. Such behavior has already partly been described [4], but not for temperatures below 100°C.…”

Section: Engine Bench Evaluationmentioning

confidence: 86%

Low Temperature Activity of Euro4 Diesel Oxidation Catalysts: Comprehensive Material Analyses and Experimental Evaluation of a Representative Panel

2009

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Diesel oxidation catalysts of 16 Euro 4 passenger cars were analyzed and tested on an engine bench to attempt to correlate composition and structure to real-life performances. Particular low temperature behavior was evidenced, which was further studied using simplified gas mixtures on a synthetic gas bench. The long chain hydrocarbons are efficiently trapped, while NO 2 plays a major role in CO abatement before the activation of the catalytic oxidation by O 2 .

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Aged DOC is a Net Consumer of NO2: Analyses of Vehicle, Engine-dynamometer and Reactor Data

Cited by 55 publications

References 4 publications

Aerosols Emitted in Underground Mine Air by Diesel Engine Fueled with Biodiesel

Aerosols Emitted in Underground Mine Air by Diesel Engine Fueled with Biodiesel

NO Oxidation Inhibition by Hydrocarbons over a Diesel Oxidation Catalyst: Reaction Between Surface Nitrates and Hydrocarbons

Low Temperature Activity of Euro4 Diesel Oxidation Catalysts: Comprehensive Material Analyses and Experimental Evaluation of a Representative Panel

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