Improvement in Selective Catalytic Reduction Model Accuracy for Predicting NOx Conversion at High Temperature

2018 ◽  
Author(s):  
Kohei Oka ◽  
Teppei Ohori ◽  
Yutaka Itagaki ◽  
Kazuo Osumi ◽  
Naoya Ishikawa ◽  
...  
Keyword(s):  
High Temperature ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Model Accuracy ◽  
Reduction Model ◽  
Nox Conversion

scholarly journals Fe2O3 enhanced high-temperature arsenic resistance of CeO2–La2O3/TiO2 catalyst for selective catalytic reduction of NOx with NH3

RSC Advances ◽  
2021 ◽  
Vol 11 (16) ◽  
pp. 9395-9402
Author(s):  
Na Wang ◽  
Changfei Ye ◽  
Huidong Xie ◽  
Chang Yang ◽  
Jinhong Zhou ◽  
...  
Keyword(s):  
High Temperature ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Arsenic Resistance ◽  
No Conversion ◽  
Tio2 Catalyst ◽  
Reduction Of Nox ◽  
Better Than

The NO conversion of the CeLa0.5Fe0.2/Ti is obviously better than that of the commercial vanadium-based catalyst with regard to arsenic resistance and it has good N2 selectivity, and good SO2 resistance.

scholarly journals Selective Catalytic Reduction of NO with NH 3 on Cu−SSZ‐13: Deciphering the Low and High‐temperature Rate‐limiting Steps by Transient XAS Experiments

ChemCatChem ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1429-1435 ◽  
Author(s):  
Adam H. Clark ◽  
Rob Jeremiah G. Nuguid ◽  
Patrick Steiger ◽  
Adrian Marberger ◽  
Andrey W. Petrov ◽  
...  
Keyword(s):  
High Temperature ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Reduction Of No ◽  
Temperature Rate ◽  
Rate Limiting

Coordinated Active Thermal Management and Selective Catalytic Reduction Control for Simultaneous Fuel Economy Improvement and Emissions Reduction During Low-Temperature Operations

2015 ◽  
Vol 137 (12) ◽  
Author(s):  
Pingen Chen ◽  
Junmin Wang
Keyword(s):  
Low Temperature ◽  
Selective Catalytic Reduction ◽  
Thermal Management ◽  
Catalytic Reduction ◽  
Coordinated Control ◽  
Nox Emissions ◽  
Total Cost ◽  
Nox Conversion ◽  
Ammonia Slip ◽  
Nox Conversion Efficiency

The low-temperature operations of diesel engines and aftertreatment systems have attracted increasing attention over the past decade due to the stringent diesel emission regulations and excessive tailpipe emissions at low temperatures. The removal of NOx emissions using selective catalytic reduction (SCR) systems during low-temperature operations remains a significant challenge. One of the popular techniques for alleviating this issue is to employ active thermal management via in-cylinder postinjection to promote aftertreatment system temperatures. Meanwhile, numerous studies have focused on ammonia coverage ratio controls with the aim to maintain high NOx conversion efficiency and low tailpipe ammonia slip. However, most of the active thermal management and SCR controls in the existing literatures were separately and conservatively designed, which can lead to higher cost of SCR operation than needed including diesel fuel consumption through active thermal management and urea solution consumption. The main purpose of this study is to design and coordinate active thermal management and SCR control using nonlinear model predictive control (NMPC) approach to minimize the total cost of SCR operation while obtaining high NOx conversion efficiency and low tailpipe ammonia slip. Simulation results demonstrate that, compared to the baseline control which consists of separated active thermal management and SCR control, the coordinated control is capable of reducing the total cost of SCR operation by 25.6% while maintaining the tailpipe NOx emissions and ammonia slip at comparable levels. Such an innovative coordinated control design concept shows its promise in achieving low tailpipe emissions during low-temperature operations in a cost-effective fashion.

Dual-template assembled hierarchical Cu-SSZ-13: morphology evolution, crystal growth and stable high-temperature selective catalytic reduction performance

CrystEngComm ◽  
2020 ◽  
Vol 22 (42) ◽  
pp. 7036-7045
Author(s):  
Li Liu ◽  
Zhiqiang Chen ◽  
Hongxia Qu ◽  
Jiaxi Yuan ◽  
Mahong Yu ◽  
...  
Keyword(s):  
Crystal Growth ◽  
High Temperature ◽  
Selective Catalytic Reduction ◽  
Ammonia Oxidation ◽  
Catalytic Reduction ◽  
Morphology Evolution

Assembled hierarchical Cu-SSZ-13 zeolites maintained excellent high-temperature activity due to mesoporous inhibition of ammonia oxidation.

scholarly journals Influence of Steam and Sulfide on High Temperature Selective Catalytic Reduction

2020 ◽  
Vol 16 (3) ◽  
pp. 615-621
Author(s):  
Jiyuan Zhang ◽  
Linbo Wang ◽  
Chengqiang Zhang ◽  
Shuzhan Bai
Keyword(s):  
High Temperature ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction

Zonal control for selective catalytic reduction system using a model-based multi-objective genetic algorithm

2019 ◽  
pp. 146808741987459
Author(s):  
Guoyang Wang ◽  
Jinzhu Qi ◽  
Shiyu Liu ◽  
Yanfei Li ◽  
Shijin Shuai ◽  
...  
Keyword(s):  
Genetic Algorithm ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Optimal Solution ◽  
Utilization Efficiency ◽  
Reduction Model ◽  
Coverage Ratio ◽  
Multi Objective ◽  
Model Based ◽  
Multi Objective Genetic Algorithm

It is challenging for aqueous urea injection control to achieve high NO x conversion efficiency while restricting tailpipe ammonia (NH3) slip. Optimizing the selective catalytic reduction systems can reduce diesel engine emissions, potentially improve fuel economy and urea utilization efficiency, and finally reduce aftertreatment costs. In this article, a model-based multi-objective genetic algorithm is adopted to optimize selective catalytic reduction systems related to trade-off between NO x emission and NH3 slip. Selective catalytic reduction model is a one-state selective catalytic reduction model based on continuous stirred tank reactor theory, which significantly reduces the computational burden. The optimal NH3 coverage ratio map was obtained globally based on world harmonized transient cycle. The effect of temperature on optimal NH3 coverage ratio, Zonal control logics extracted from the optimal solution, and the control problems on different zones were analyzed. The zonal control logics were validated on multiple test cycle with different initial NH3 coverage ratios. Results show that the zonal control achieves high NO x conversion while restricting the tailpipe NH3 slip. With this method, NO x emission and NH3 slip of optimal solution can meet the requirements of the Euro VI emission regulation for heavy-duty diesel engines.

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