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Showing 1 to 20 of 28 for “"NOx reduction"”.
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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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Role of Storage Material in NOX Storage and Reduction (NSR) and Three-Way Catalysts (TWC) During Cycling Operation
NOx storage and reduction (NSR) is a cyclic catalytic process that eliminates NOx from lean burn vehicles. There is an active debate about the NOx reduction mechanism, particularly at a high temperature and cycle frequency. Three-way catalysts (TWC) are widely applied in stoichiometric combustion …
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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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A study on the flow characteristics of an industrial radiant tube burner
… behind swirling flows and methane combustion. NOx reduction techniques are discussed and numerical modelling of combusting flows is detailed in this section. The importance of turbulence, radiation and combustion modelling is highlighted, as well as the numerical schemes that incorporate …
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On-Board-Reduktionsmittelherstellung zur NO x-Emissionsminderung bei Dieselfahrzeugen
The reduction of Diesel engine exhaust NOx emissions requires a reductant due to the composition (high oxygen content) of the exhaust gas. An efficient reductant is selected based on the comparison of literature data of different NOx reduction processes. A process for the on-board synthesis of this …
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Poisoning and Sulfation on Vanadia SCR Catalyst
… and sulfation and tungsten enhance SCR NOx reduction activity. Both the decrease and increase of catalyst activity arise from the decrease and increase of the pre-exponential factor (A) correspondingly. Moreover, the decrease of NO reduction activity from each poison are consistent with …
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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 Experimental Investigation into NOx Control of a Gas Turbine Combustor and Augmentor Tube Incorporating a Catalytic Reduction System
… of NO x emission control using catalytic reduction techniques in the jet engine test cell environment. A modified T-63 gas turbine combustor and an augmentor tube, 21 feet in length and containing a perlite catalyst, were used as a gas generator and catalytic reduction system. Four data …
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Biomass reburning for control of nitrogen oxides
… localized eddies that are fuel-rich, where the NOx reduction takes place. FLGR does not require over-fire air to complete the combustion of fuel fragments. Fuel-lean biomass reburning is a variation of FLGR that uses biomass instead of natural gas as the reburn fuel.;The goal of this work was to …
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Some Cost Effective Techniques for Reducing NOx Emissions at Blue Ridge Paper Company
… to reduce their emissions of nitrogen oxides (NOx) and how these emissions might be reduced in a cost effective way. Ultimately, it is focused on aiding a paper plant in the western part of the state to obtain a better understanding of the recent legislation that has impacted the plant …
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Ozone air pollution and stage-of-change status for alternative transportation usage among college students
… for 49% of emissions of O3's precursor, NOx. Reduction of auto emissions will be necessary in order to attain healthful O3 levels. Part of the solution will involve increased usage of more sustainable transportation sources. This study used a self-report survey, developed by the …
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Numerische Untersuchung von N 2 -O 2 -Plasma-Freistrahlen als plasmatechnologische Methode zur NO x -Reduktion in synthetischen Abgasen
… to use microwave induced N2-O2 plasmas to reduce NOx emissions of direct injecting gasoline and Diesel engines reaching the limits of the EURO 4 exhaust gas standards is of special interest. This work makes the attempt to explore the fundamental plasmachemical reaction paths of NOx kinetics in hot …
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Impact of Water Injection on Emissions of Nitrogen Oxides from Aircraft Engines
… emissions increase with temperature, so a NOₓ reduction technique has been proposed where water is injected in different regions of a gas turbine engine to cool down the peak flame temperature and decrease NOₓ production. In previous studies, water injection has been simulated on existing …
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Experimental and numerical investigation of flameless pulverised coal combustion
… showed, that it is highly beneficial in terms of NOx reduction to use N2 as coal carrier instead of air. The finding has been supported by OH* chemiluminescence imaging which revealed a suppression of ignition in the coal jet when N2 is used. With the investigated settings, NOx emissions are …
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The catalytic reduction of emissions from a natural gas fueled spark ignited engine
… fueled by natural gas. One possible emissions reduction strategy is the catalytic aftertreatment of the engine-out exhaust for stoichiometric operation. The focus of this work was to develop a catalytic converter test facility, to evaluate the operational and emissions characteristics of a …
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Emission Reduction and Assisted Combustion Strategies for Compression Ignition Engines with Subsequent Testing on a Single-Cylinder Engine
… are testing and developing various emission reduction strategies for compression ignition engines. This thesis contains three sections where the author details two separate strategies for emission reduction and assisted combustion. Combustion resulting from compression ignition diesel engines …
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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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Analysis of nitrogen oxide emissions produced during combustion of cracked-ammonia fuels
… This work compares the flame stability and NOx production of the two mixtures (with and without additional nitrogen). The range of operating conditions (equivalence ratio, fuel-hydrogen mole fraction, axial velocity) at which laminar burner-stabilized flames exist is defined. Experimental …
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The catalytic reduction of nitric oxide over copper doped aluminosilicates
… facility capable of the simultaneous removal of NOx, SO₂ and particulates from flue gas at high temperature. This project forms the initial phase of the development of such a high temperature flue gas cleaning facility and is limited to the study of catalytic NOx reduction over aluminosilicates. …
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