Results 221 to 230 of about 4,606 (263)

NO storage/reduction over lean-burn automotive catalysts

Applied Catalysis B: Environmental, 2007
This paper shows the behavior of a Pt/Ba/¿–Al2O3 automotive catalyst in a fixed bed reactor during cyclic operation at lean and rich gas phase conditions at short (seconds) and long (hours) cycling times at different temperatures. Reactor exit gas phase concentrations have been measured and catalyst properties have been determined before and after ...
Scholz, C.M.L., Gangwal, V.R., Hoebink, J.H.B.J., Schouten, J.C.   +3 more
openaire   +1 more source

Homogeneous Chemistry in Lean-Burn Exhaust Mixtures

The Journal of Physical Chemistry A, 1997
The search for catalysts capable of reducing NOx in the exhaust of internal combustion engines operated in the lean-burn mode is presently focused on copper-exchanged zeolites. Despite intensive study, the mechanism of reduction over these catalysts is not well understood. In this study new complications are revealed.
Julian Smith, Jonathan Phillips, Alan Graham, Raymond Steele, Antonio Redondo, James Coons   +5 more
openaire   +1 more source

The Hybrid Rich-Burn/Lean-Burn Engine

Journal of Engineering for Gas Turbines and Power, 1997
This paper describes a new low-emissions engine concept called the hybrid rich-burn/lean-burn (HRBLB) engine. In this concept a portion of the cylinders of a multicylinder engine are fueled with a very rich natural gas-air mixture. The remaining cylinders are operated with a lean mixture of natural gas and air and supplemented with the rich combustion ...
D. P. Meyers, J. T. Kubesh
openaire   +1 more source

The Volkswagen Lean Burn PC-Engine Concept

SAE Technical Paper Series, 1980
<div class="htmlview paragraph">Results from the 1600 cm³ PCI- (PreChamber Injection) Stratified Charge Engine with a divided combustion chamber and fuel injection into the prechamber were described in SAE Paper 750 869. The main objective of continued development on this engine was to meet future emission and fuel economy ...
openaire   +1 more source

Dynamic Optimization of Lean Burn Engine Aftertreatment

Journal of Dynamic Systems, Measurement, and Control, 2000
The competition to deliver fuel efficient and environmentally friendly vehicles is driving the automotive industry to consider even more complex powertrain systems. Adequate performance of these new highly interactive systems can no longer be obtained through traditional approaches, which are intensive in hardware use and final control software ...
Jun-Mo Kang, Ilya Kolmanovsky, J. W. Grizzle   +2 more
openaire   +1 more source

Formation of formaldehyde in lean-burn gas engines

MTZ worldwide, 2009
In recent times stationary gas engines, especially those fuelled with poor gases such as biogas or landfill gas, have shown amounts of formaldehyde (HCHO) emissions exceeding the given limits of the German emission regulation TA Luft. In order to achieve compliance with the emission regulations, research was conducted at the Lehrstuhl fur ...
Markus Bauer, Georg Wachtmeister
openaire   +1 more source

Development of KMC 2.4L Lean Burn Engine

SAE Technical Paper Series, 1995
<div class="htmlview paragraph">This paper describes the development process and test results of the lean burn engine. LML (Lean Misfire Limit) extension and NOx emission reduction was realized in combination with the following factors. (1) Installing several types of SCV (Swirl Control Valve) with different section shapes and dividing wall in ...
Chulho Yu, Taehoon Kim, Yonggyun Yi, Juheon Lee, Seokhong Noh, Kyuhoon Choi   +5 more
openaire   +1 more source

Effusion Cooling System Optimization for Modern Lean Burn Combustor

Volume 5B: Heat Transfer, 2016
Stricter legislation limits concerning NOx emissions are leading main aero-engine manufacturers to update the architecture of the combustors towards the implementation of lean burn combustion concept. Cooling air availability for the thermal management of combustor liners is significantly reduced, demanding even more effective liner cooling schemes ...
Andreini, Antonio, Becchi, Riccardo, Facchini, Bruno, Mazzei, Lorenzo, Picchi, Alessio, Peschiulli, Antonio   +5 more
openaire   +1 more source

Modelling Strategies for Large-Eddy Simulation of Lean Burn Spray Flames

Volume 4B: Combustion, Fuels and Emissions, 2017
During the last years aero-engines are progressively evolving toward design concepts that permit improvements in terms of engine safety, fuel economy and pollutant emissions. With the aim of satisfying the strict NOx reduction targets imposed by ICAO-CAEP, lean burn technology is one of the most promising solutions even if it must face safety concerns ...
Puggelli, S., Bertini, D., Mazzei, L., Andreini, A.   +3 more
openaire   +2 more sources

DeNOx catalyst for automotive lean-burn engine

Catalysis Today, 1996
Abstract The performance and durability of Cu-ZSM-5 were studied. Cu-ZSM-5 has fairly high NOx reduction activity but its durability is insufficient for practical use. We developed a new deNOx catalyst. In this catalyst, we call NOx storage reduction catalyst (NSR-catalyst), NOx emitted from an engine at lean A F operation is stored and this ...
openaire   +1 more source