Realizing the need for e®ective kinetic models that could be used over wide op-erating regimes, oxidation and storage kinetics for a diesel oxidation catalyst (DOC) were developed in this work. As a first step towards kinetics development, a simple catalyst formulation including only Platinum was chosen. Kinetics were generated by assuming that propylene was representative all the hydrocarbons (HCs) in the exhaust. A systematic methodology was formulated which consisted of (1) careful choice of concentration/temperature domain (2) measurement of reactor conversions of aged catalyst samples at chosen test points using a high space velocity integral reactor (3) developing a simplified 1D reactor model (4) defining an objective func- tion which is critically sensitive to the differences between model predictions and experiments at all conversions (5) generating proper initial guesses and finally (6) modifying Langmuir-Hinshelwood rate expressions to arrive at the final rate forms. This methodology can be used to generate steady state global kinetics in general.
Archiv: Diesel
2010 2 Feb
Global Reaction Kinetics for Oxidation and Storage in Diesel Oxidation Catalysts
Abgelegt unter: Forschung | RSS 2.0 | TB | Tags: Diesel, Global Reaction | Keine Kommentare
2008 27 Dez
Mercedes Introduces Cleaner, Quieter Diesel
Abgelegt unter: Allgemein | RSS 2.0 | TB | Tags: Adblue, Diesel | Keine Kommentare
Mercedes Introduces Cleaner, Quieter Diesel
Diesel engines have a well-deserved reputation of being noisy and smelly. We normally think of them clattering under the enormous hoods of industrial haulers. Or, we may have friends who use diesel pickups for heavy-duty hauling. Remember the Diesel Rabbit? Slow. Recall Oldsmobile’s failed experiment with Diesels in the 1980s? Sigh.
By : Steve Schaefer : 12/25/08
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2008 12 Nov
Changes in Diesel Fuel
Abgelegt unter: Allgemein, Grundlagen | RSS 2.0 | TB | Tags: Adblue, Diesel, Fuel | Keine Kommentare
The Changes in Gasoline manual series was first introduced in July 1987. Due to continuing changes in gasoline, driven in large part by environmental requirements, the manual has been revised and updated three times over the past twenty years. The focus of the manual series has been to present information about gasoline quality as it relates to vehicle performance and driveability. The manual series is targeted specifically to the service and repair professional who needs a condensed, concise, fuel quality information resource that covers their specific areas of interest. The Changes in Gasoline manual series boasts a circulation exceeding 500,000 copies, with a new edition to be released soon. Over the years we have received numerous requests for a companion manual on diesel fuel quality. In recent years there has been an increasing amount of environmental regulations that impact both the diesel engine and the fuels that power them. These changes have led to our decision to finally write and release Changes in Diesel Fuel - The Service Technician’s Guide to Compression Ignition Fuel Quality. We encourage you to read on and see why we believe that, similar to Changes in Gasoline, this manual will become the service and repair industry’s definitive guide to diesel fuel quality.