Catalysed oxidation of nitric oxide to nitrogen dioxide

Hilliard, John C.; Wheeler, R. W.

doi:10.1016/0010-2180(77)90089-x

Cited by 12 publications

(4 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…9 The presence of CO in large quantities will also inhibit the formation of NO 2 . 10 The formation of NO 2 is highly temperature dependent. At temperatures above 1650°F, NO 2 and HO 2 are consumed by reactions that compete more efficiently for their constituents.…”

Section: Composition Of No X Emitted From Lean-burnmentioning

confidence: 99%

Impact of Oxidation Catalysts on Exhaust NO₂/NO_x Ratio from Lean-Burn Natural Gas Engines

Olsen

Kohls

Arney

2010

Journal of the Air & Waste Management Association

View full text Add to dashboard Cite

Section: Composition Of No X Emitted From Lean-burnmentioning

confidence: 99%

Impact of Oxidation Catalysts on Exhaust NO₂/NO_x Ratio from Lean-Burn Natural Gas Engines

Olsen

Kohls

Arney

2010

Journal of the Air & Waste Management Association

View full text Add to dashboard Cite

“…The NO 2 , once formed, subsequently decays down the exhaust pipe. 31 ' 33 If substantial quantities of NO2 are formed in the engine, then HNO3 could also be present. If so, nitration reactions could proceed very rapidly in the engine or tail pipe.…”

Section: Formation Of Nitro-pah In the Engine/exhaust Systemmentioning

confidence: 99%

Factors Influencing the Emissions of Nitrated-Polynuclear Aromatic Hydrocarbons(Nitro-PAH) from Diesel Engines

Schuetzle

Perez

1983

Journal of the Air Pollution Control Association

View full text Add to dashboard Cite

“…4. The last region begins after full oxidation has been reached and is characterized by the reduction of NO 2 into NO in accordance with the thermodynamic properties of their equilibrium reaction [22].…”

Section: Effect On No Xmentioning

confidence: 85%

Characterization and Evaluation of Methane Oxidation Catalysts for Dual-Fuel Diesel and Natural Gas Engines

Worth

Stettler

Dickinson

et al. 2016

Emiss. Control Sci. Technol.

View full text Add to dashboard Cite

The UK has incentivized the use of natural gas in heavy goods vehicles (HGVs) by converting to dual-fuel (DF) diesel-natural gas systems to reduce noxious and greenhouse gas emissions. Laboratory and on-road measurements of DF vehicles have demonstrated a decrease in CO 2 emissions relative to diesel, but there is an increase in greenhouse gas (CO 2 e) emissions because of unburned methane. Decreasing tailpipe emissions of methane via after-treatment devices in lean-burn compression ignition engines is a challenge because of low exhaust temperatures (∼400°C) and the presence of water vapor. In this study, six commercially available methane oxidation catalysts (MOCs) were tested for their application in DF HGV vehicles. Each MOC was characterized in terms of the catalyst platinum group metal (PGM) loading (both Pd and Pt), particle size, catalytic surface area, and Pd:Pt ratio. In addition, the washcoat surface area, pore volume, and pore size were evaluated. The MOC conversion efficiency was evaluated in controlled methane-oxidation experiments with varying temperatures, flow rates, and gas compositions. Characteristic-conversion efficiency correlations demonstrate that the influential MOC characteristics were PGM loading (both Pd and Pt), Pd:Pt ratio, washcoat surface area, and washcoat pore volume. With 90 % methane oxidation at less than 400°C in DF HGV exhaust conditions, sample 1 had the highest conversion efficiency because of a high PGM loading (330 g/ft 3 , 12,000 g/m 3), a 5.9 Pd:Pt ratio, a high alumina washcoat surface area of 20 m 2 /cm 3 , and 74-mm 3 /cm 3 pore volume. Additional studies showed increased MOC conversion efficiency with decreasing gas hourly space velocities (GHSVs) and increasing methane concentrations.

show abstract

Catalysed oxidation of nitric oxide to nitrogen dioxide

Cited by 12 publications

References 6 publications

Impact of Oxidation Catalysts on Exhaust NO₂/NO_x Ratio from Lean-Burn Natural Gas Engines

Impact of Oxidation Catalysts on Exhaust NO₂/NO_x Ratio from Lean-Burn Natural Gas Engines

Factors Influencing the Emissions of Nitrated-Polynuclear Aromatic Hydrocarbons(Nitro-PAH) from Diesel Engines

Characterization and Evaluation of Methane Oxidation Catalysts for Dual-Fuel Diesel and Natural Gas Engines

Contact Info

Product

Resources

About

Catalysed oxidation of nitric oxide to nitrogen dioxide

Cited by 12 publications

References 6 publications

Impact of Oxidation Catalysts on Exhaust NO2/NOx Ratio from Lean-Burn Natural Gas Engines

Impact of Oxidation Catalysts on Exhaust NO2/NOx Ratio from Lean-Burn Natural Gas Engines

Factors Influencing the Emissions of Nitrated-Polynuclear Aromatic Hydrocarbons(Nitro-PAH) from Diesel Engines

Characterization and Evaluation of Methane Oxidation Catalysts for Dual-Fuel Diesel and Natural Gas Engines

Contact Info

Product

Resources

About

Impact of Oxidation Catalysts on Exhaust NO₂/NO_x Ratio from Lean-Burn Natural Gas Engines

Impact of Oxidation Catalysts on Exhaust NO₂/NO_x Ratio from Lean-Burn Natural Gas Engines