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Advances in NOx Reduction Technology, 2017
Viewing 1 to 13 of 13
Investigation of SCR Catalysts for Marine Diesel Applications
Author(s): Konstandopoulos, A., Zarvalis, D., Chasapidis, L., Deloglou, D. et al.
Abstract Evolving marine diesel emission regulations drive significant reductions of nitrogen oxide (NOx) emissions. There is, therefore, considerable interest to develop and validate Selective Cataly....
Impact of Hydrothermal Aging on the Formation and Decomposition of Ammonium Nitrate on a Cu/zeolite SCR Catalyst
Author(s): Ottinger, N., Xi, Y., Keturakis, C., and Liu, Z.
Abstract Low-temperature (T ≤ 200°C) NOx conversion is receiving increasing research attention due to continued potential reductions in regulated NOx emissions from diesel engines. At these temperatur....
Radio-Frequency-Based Urea Dosing Control for Diesel Engines with Ammonia SCR Catalysts
Author(s): Dietrich, M., Steiner, C., Hagen, G., and Moos, R.
Abstract The radio-frequency (RF) or microwave-based catalyst state determination offers the opportunity to operate an automotive catalyst at its optimal point. This has already been proven for the ox....
Detailed Mechanism of S Poisoning and De-Sulfation Treatment of Cu-SCR Catalyst
Author(s): Ando, R., Hihara, T., Banno, Y., Nagata, M. et al.
Abstract Modern diesel emission control systems often use Urea Selective Catalytic Reduction (Urea-SCR) for NOx control. One of the most active SCR catalysts is based on Cu-zeolite, specifically Cu-Ch....
Selective Catalytic Reduction Control with Multiple Injectors
Author(s): Hendrickson, C., Upadhyay, D., and Van Nieuwstadt, M.
Abstract Over the past decade urea-based selective catalytic reduction (SCR) has become a leading aftertreatment solution to meet increasingly stringent Nitrogen oxide (NOx) emissions requirements in ....
The Effects of CO, C2H4, and H2O on the NOx Storage Performance of Low Temperature NOx Adsorbers for Diesel Applications
Author(s): Theis, J. and Lambert, C.
Abstract Model low temperature NOx adsorbers (LTNA) consisting of Pd on a ceria/zirconia washcoat on monoliths were evaluated for low temperature NOx storage under lean conditions to assess their pote....
After-Treatment Systems to Meet China NS VI, India BS VI Regulation Limits
Author(s): Yang, L., Sukumar, B., Naseri, M., Markatou, P. et al.
Abstract Future emissions regulations proposed for the Asian automotive industry (BS VI regulations for India and NS VI regulations for China) are strict and similar to EU VI regulations. As a result,....
Performance Studies and Correlation between Vehicle- and Rapid- Aged Commercial Lean NOx Trap Catalysts
Author(s): De Abreu Goes, J., Olsson, L., Berggrund, M., Kristoffersson, A. et al.
Abstract Even though substantial improvements have been made for the lean NOx trap (LNT) catalyst in recent years, the durability still remains problematic because of the sulfur poisoning and sinterin....
Effect of Transition Metal Ion Properties on the Catalytic Functions and Sulfation Behavior of Zeolite-Based SCR Catalysts
Author(s): Kumar, A., Kamasamudram, K., Currier, N., and Yezerets, A.
Abstract Copper- and Iron- based metal-zeolite SCR catalysts are widely used in US and European diesel aftertreatment systems to achieve drastic reduction in NOx emission. These catalysts are highly s....
Robust, Model-Based Urea Dosing Control for SCR Aftertreatment Systems using a Cross-Sensitive Tailpipe NOx Sensor
Author(s): Hommen, G., Kupper, F., and Seykens, X.
Abstract This article describes a NOx sensor based urea dosing control strategy for heavy-duty diesel aftertreatment systems using Selective Catalytic Reduction. The dosing control strategy comprises ....
Development of Robust Electric Heating System for Medium Duty Diesel Vehicles
Author(s): Culbertson, D., Pradun, J., Khair, M., and Diestelmeier, J.
Abstract Tightening regulations throughout the world demand a reduction in fuel consumption and NOX emission levels, creating an increasing need for additional heat for SCR aftertreatment. A durable a....
Cascade MPC Approach to Automotive SCR Multi-Brick Systems
Author(s): Krejza, P., Pekar, J., Figura, J., Lansky, L. et al.
Abstract The paper provides an overview of a developed methodology and a toolchain for modeling and control of a complex aftertreatment system for passenger cars. The primary objective of this work is....
Twin-LNT System for Advanced Diesel Exhaust Gas Aftertreatment
Author(s): Boerensen, C., Roemer, D., Nederlof, C., Smirnov, E. et al.
Abstract The most significant challenge in emission control for compression ignited internal combustion engines is the suppression of NOx. In the US, NOx-levels have faced a progressive reduction for ....
Viewing 1 to 13 of 13