Modeling and analysis of transport and reaction in washcoated monoliths: Cu-SSZ-13 SCR and dual-layer Cu-SSZ-13 + Pt/Al2O3 ASC

2019 ◽  
Vol 4 (6) ◽  
pp. 1103-1115 ◽  
Author(s):  
Pritpal S. Dhillon ◽  
Michael P. Harold ◽  
Di Wang ◽  
Ashok Kumar ◽  
Saurabh Y. Joshi
Keyword(s):  
Selective Catalytic Reduction ◽  
Ammonia Oxidation ◽  
Catalytic Reduction ◽  
Modeling And Analysis ◽  
Ammonia Slip ◽  
Monolith Catalysts

Modeling and analysis of washcoated single- and dual-layer monolith catalysts is presented for selective catalytic reduction (SCR) on Cu-SSZ-13 and ammonia oxidation on Cu-SSZ-13 + Pt/Al2O3 ammonia slip catalyst (ASC).

Transfer and Reaction Performances of Selective Catalytic Reduction of N2O with CO over Monolith Catalysts

2013 ◽  
Vol 21 (8) ◽  
pp. 835-843 ◽  
Author(s):  
Chengna DAI ◽  
Zhigang LEI ◽  
Yuli WANG ◽  
Runduo ZHANG ◽  
Biaohua CHEN
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Monolith Catalysts

Selective Catalytic Reduction of NO by CH4 on Platinum-Based Monolith Catalysts

2006 ◽  
Vol 22 (08) ◽  
pp. 1004-1009
Author(s):  
FANG Hua ◽  
◽  
◽  
CAI Li ◽  
LIU Ping ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Reduction Of No ◽  
Monolith Catalysts

SO2-Tolerant Selective Catalytic Reduction of NOx over Meso-TiO2@Fe2O3@Al2O3 Metal-Based Monolith Catalysts

2019 ◽  
Vol 53 (11) ◽  
pp. 6462-6473 ◽  
Author(s):  
Lupeng Han ◽  
Min Gao ◽  
Jun-ya Hasegawa ◽  
Shuangxi Li ◽  
Yongjie Shen ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Reduction Of Nox ◽  
Monolith Catalysts

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.

Investigation of the selective catalytic reduction of NO by NH3 on Fe-ZSM5 monolith catalysts

2006 ◽  
Vol 66 (3-4) ◽  
pp. 208-216 ◽  
Author(s):  
Oliver Kröcher ◽  
Mukundan Devadas ◽  
Martin Elsener ◽  
Alexander Wokaun ◽  
Nicola Söger ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Reduction Of No ◽  
Monolith Catalysts

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.

It is no laughing matter: nitrous oxide formation in diesel engines and advances in its abatement over rhodium-based catalysts

2016 ◽  
Vol 6 (21) ◽  
pp. 7671-7687 ◽  
Author(s):  
Magdalena Jabłońska ◽  
Regina Palkovits
Keyword(s):  
Nitrous Oxide ◽  
Diesel Engine ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Oxide Formation ◽  
Diesel Oxidation Catalysts ◽  
Diesel Oxidation ◽  
Ammonia Slip ◽  
Aftertreatment Systems ◽  
By Products

N2O appears as one of the undesired by-products in exhaust gases emitted from diesel engine aftertreatment systems, such as diesel oxidation catalysts (DOC), lean NOx trap (LNT, also known as NOx storage and reduction (NSR)) or selective catalytic reduction (NH3-SCR and HC-SCR) and ammonia slip catalysts (ASC, AMOX, guard catalyst).

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