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Showing 1 to 20 of 526 for “"NOx"”.
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Reactive based NOx sensor
… technology has virtually eliminated carbon monoxide and particulate emissions. Sulfur oxide emissions have been eliminate by the use of ultra-low sulfur fuel. Nitrogen oxide (NOx) emissions are still not in line with up-coming EPA regulations. NOx sensors are required for all catalysts being …
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An examination of techniques for the removal of NOx and NOx/SOx from flue gases.
Dept. of Chemistry and Biochemistry. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1983 .C545. Source: Masters Abstracts International, Volume: 40-07, page: . Thesis (M.A.Sc.)--University of Windsor (Canada), 1983.
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Unraveling the fingerprints of NOx using stable isotopes: Implications for NOx source partitioning and oxidation chemistry
… composition (δ15N & δ18O) of nitrogen oxides (NOx )may be a useful tool for constraining NOx emission sources as well as for understanding the atmospheric oxidation pathways responsible for its removal if various NOx sources and sink processes exhibit characteristic isotopic compositions …
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Probing Interactions Between Canonical NOX Domains
<p>NAPDH oxidase enzymes (NOXes) reduce molecular oxygen to superoxide and other ROS. NOXes contain a catalytic core comprising a heme-containing transmembrane (TM) domain and a cytoplasmic dehydrogenase (DH) domain that binds the substrate NADPH and the cofactor. Previously, NOXes were only …
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Electrochemical NOx reduction using a carbon nanospiked catalyst
Electrochemical NOx reduction was studied using a novel, nanostructured nitrogen-doped carbon nanospikes catalyst (CNS). NOx is a major environment and health concern that is typically eliminated using noble-metal gas-phase catalytic reactors. Alternatively, an electrocatalytic approach may reduce …
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NOx Removal by LNT-SCR Dual-layer Catalysts
… emission standards have driven the progress of NOx storage and reduction (NSR) technology. NOx is stored in a lean NOx trap (LNT) catalyst during fuel-lean mode and reduced to N2 during fuel-rich mode. First, we investigated the impact of ceria on NSR in an Pt/Ce LNT catalyst. The physisorbed …
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Mechanistic Investigation of FCC CO/NOx Emission Control Additives
… released from this unit in the form of NOx and NH3. Among the different technologies currently employed to control these pollutants, the use of catalytic additives is the most attractive one, as it is simple, cost-effective, and applicable to existing FCC units without the need for …
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In Cylinder NOx Control Technologies for Marine Diesel Engines
… their potential in order to reach the IMO Tier 3 NOx emissions target. By means of extreme Miller cycles, with Early Intake Valve Closures (EIVC up to 100 crank angle degrees before BDC), a shorter compression stroke and lower charge temperatures inside the cylinder can be achieved and thanks to …
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An Environmental Cost Basis for Regulating Aviation NOx Emissions/
Nitrogen oxides and carbon dioxide are two by-products of combustion in aircraft engines, and have different impacts on the environment. Nitrogen oxides (NO[subscript x]) are both an air quality concern and an indirect contributor to radiative forcing, while carbon dioxide (CO₂) is a long-lived …
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NOx control and environmental regulation : techniques and discriminatory social outcomes
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994.
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Investigation of accelerated ageing protocols applied to Lean NOx Trap catalysts
… of a tri-metal (Pt-Pd-Rh) commercial Lean NOX Trap (LNT) catalyst. The investigation has been focused on the correlation between the real-world ageing and artificial or rapid-ageing procedures. Samples exposed to hydrothermal, vehicle and dynamometer ageing have been fully characterized, …
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The analysis of Bcr-Abl—Nox signalling in chronic myeloid leukaemia
… studies have demonstrated that NADPH oxidase (Nox) activity contributes to intracellular-ROS levels in Bcr-Abl-positive cells, enhancing survival signalling. The objective of this study was to elucidate how Nox protein activity was influenced downstream of Bcr-Abl while examining how …
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Sviluppi di catalizzatori per l'abbattimento di NOx in presenza di ossigeno
… veicolare è la principale fonte antropogenica di NOx, idrocarburi (HC) e CO e, dato che la sostituzione dei motori a combustione interna con sistemi alternativi appare ancora lontana nel tempo, lo sviluppo di sistemi in grado di limitare al massimo le emissioni di questi mezzi di trasporto riveste …
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Two-Phase Anaerobic Digestion to Reduce the NOx Emission Potential of Biogas
… implement due to the high costs of controlling NOx emissions. NOx production can be minimized by blending H<sub>2</sub> gas with CH<sub>4</sub> at a volume ratio of 15:85 H<sub>2</sub>:CH<sub>4</sub>, which allows burning at ultra-lean air-to-fuel ratios. For biogas systems, a potential low-cost …
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Structure and Nitrogen Chemistry in Coal, Biomass, and Cofiring Low-NOx Flames
… facility was fired with a dual-feed low-NOx burner capable of independently conveying 2 separate fuels unblended to the burner. Spatially detailed gas species measurements were made for 8 flames, including a coal, straw, finely ground straw, wood, and 4 straw/coal cofiring flames. …
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Performance simulation and control design for diesel engine NOx emission reduction technologies
… are studied for off-road diesel engine NOx emission reductions: stoichiometric combustion ignition (SCI) and lean NOx trap (LNT). The concept of the stoichiometric compression ignition (SCI) engine was investigated for implementation in a turbocharged diesel engine through co-simulation. …
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Fuel-NOx Formation during Low-Grade Fuel Combustion in a Swirling-Flow Burner
<p>Insufficient knowledge of fireside behavior in the near-burner region during biomass combustion is one of major factors preventing widespread use of this renewable fuel in pulverized coal power plants. The current research is aimed to investigate the impact of biomass cofiring on NO formation in …
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Experimental investigation and numerical modeling of radially stratified low-NOx natural gas flames
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994.
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Fundamental Understanding of NOx Sequestration Capacity And Pathways in Nano-TiO2 Engineered Cementitious Materials
… that capture nitrogen oxide species (NOx) from the atmosphere, then oxidizing them into nitrite and nitrate species. Because nitrite- and nitrate-based corrosion inhibitors are effective in improving corrosion resistance in reinforced concrete, there is potential to develop nano-TiO2 …
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