Development and Validation of a Cu-Zeolite SCR Catalyst Model

Watling, Timothy C.; Tutuianu, Monica; Desai, Maya R.; Dai, Jianhua; Markatou, Penelope; Johansson, Åsa

doi:10.4271/2011-01-1299

Cited by 29 publications

(13 citation statements)

References 28 publications

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“…Currently, the average model prediction error can achieve within 10%, 8 but the predictions of NH 3 slip show to be with much larger error. 1,9 Since the ammonia storage in the converter is unmeasurable, the calibration and validation of the model are difficult.…”

Section: System Configurationmentioning

confidence: 99%

A novel NH₃ slip control for diesel engine selective catalytic reduction aftertreatment system

Yuan

Gao

Wang

2014

International Journal of Engine Research

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To meet the future emission legislations, selective catalytic reduction aftertreatment system becomes a leading aftertreatment technique for heavy-duty diesel engines. In this article, a two-cell selective catalytic reduction model is first calibrated and verified on an experimental test bench. In order to regulate the ammonia coverage ratio in a proper range, an ammonia storage control is proposed based on the selective catalytic reduction model. The problem of NH 3 slip during temperature rise is discussed and a corresponding perturbation injection control is proposed to buffer the sudden change in selective catalytic reduction ammonia storage capability. The NH 3 slip control performance of the proposed strategy is experimentally validated in European Transient Cycle.

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Section: System Configurationmentioning

confidence: 99%

A novel NH₃ slip control for diesel engine selective catalytic reduction aftertreatment system

Yuan

Gao

Wang

2014

International Journal of Engine Research

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“…Many SCR models have been established for both Cu-zeolite and Fe-zeolite catalysts. A single ammonia storage site was used in most of the published models (Markatou et al, 2011;Watling et al, 2011;Colombo et al, 2012). Colombo et al (2012) developed a new dual-site approach to establish a new model for obtaining an accurate description of the NH 3 adsorption/desorption over the entire 50-550°C temperature window.…”

Section: Introductionmentioning

confidence: 99%

Simulation Study of Ammonia Storage Characteristics of Selective Catalytic Reduction for Diesel Engines

Tan

Huang

et al. 2021

Environmental Engineering Science

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Non-road machinery is very important, but non-road machinery has problems such as working under complex operating conditions. Agricultural machinery is an important type of non-road machinery, which mainly relies on diesel engines due to their high fuel efficiencies. The exhaust temperature of agricultural machinery changes drastically under different working conditions. This article aims to research on pollution control of non-road machinery. Among the exhaust after treatment technologies, selective catalytic reduction (SCR) technology is a very important method to reduce NO x. In this study, a series of tests was conducted to investigate the effects of temperature and exhaust gas mass flow on the NO x conversion and dynamic ammonia storage space distribution characteristics in simulation models. The genetic algorithm, a kind of global optimization algorithm that can avoid local optimization, was used in the parameter identification process. The simulation results showed that the ammonia storage capacity of SCR catalyst decreases as the temperature of SCR increases. With the decrease in temperature, the NH 3 desorption rate gradually decreased. An uneven distribution of ammonia storage similar to the shape of e was observed in the simulation and this kind of uneven distribution is obvious at low temperature. The effective area of the catalyst is near the inlet of the catalyst. This work presents an approach to help figure out the details in the ammonia storage process. This work provides information about the dynamic ammonia storage characteristics and guide for better SCR design.

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“…Numerous mathematical models that describe chemistry, mass transfer, thermal and flow phenomena in SCR systems have been published and validated in the recent literature (5,6,7,8,9) . In the present work, we employ a commercial simulation tool (axisuite ® ) to demonstrate a model-based comparison of different SCR substrate technologies, particularly focusing on conventional washcoated and innovative high-porosity catalysts.…”

Section: Introductionmentioning

confidence: 99%

Model-based Optimization of Advanced SCR Substrates

Koltsakis

Stavros²,

Thomas

et al. 2015

IJAE

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Innovative high porosity SCR substrates are targeting at optimum utilization of high catalyst amounts without increasing pressure drop. Mathematical modeling of such technologies is challenging, requiring accurate description of both chemistry and mass transfer inside the active material. In this work, a systematic experimental study is conducted towards calibrating a comprehensive commercial simulation model for a Cu-zeolite SCR catalyst. Based on the calibrated model, it is possible to evaluate different substrate technologies with respect to NOX conversion, pressure drop and packaging volume reduction potential.

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Development and Validation of a Cu-Zeolite SCR Catalyst Model

Cited by 29 publications

References 28 publications

A novel NH₃ slip control for diesel engine selective catalytic reduction aftertreatment system

A novel NH₃ slip control for diesel engine selective catalytic reduction aftertreatment system

Simulation Study of Ammonia Storage Characteristics of Selective Catalytic Reduction for Diesel Engines

Model-based Optimization of Advanced SCR Substrates

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Development and Validation of a Cu-Zeolite SCR Catalyst Model

Cited by 29 publications

References 28 publications

A novel NH3 slip control for diesel engine selective catalytic reduction aftertreatment system

A novel NH3 slip control for diesel engine selective catalytic reduction aftertreatment system

Simulation Study of Ammonia Storage Characteristics of Selective Catalytic Reduction for Diesel Engines

Model-based Optimization of Advanced SCR Substrates

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Product

Resources

About

A novel NH₃ slip control for diesel engine selective catalytic reduction aftertreatment system

A novel NH₃ slip control for diesel engine selective catalytic reduction aftertreatment system