Influences of AdBlue® spray targeting and mixing devices on the UWS distribution upstream of the SCR catalyst

2012 ◽  
pp. 21-41 ◽  
Author(s):  
J. Maass ◽  
A. Eppler ◽  
J. Scholz ◽  
H. Gentgen ◽  
F. Grumbrecht ◽  
...  
Keyword(s):  
Scr Catalyst

scholarly journals A novel method for automated SCR catalyst uniformity measurement

2021 ◽  
pp. 130257
Author(s):  
Sauli Halonen ◽  
Satu Pitkäaho ◽  
Tiina M. Pääkkönen ◽  
Esa Väisänen ◽  
Mauri Haataja
Keyword(s):  
Scr Catalyst ◽  
Novel Method

scholarly journals AFX Zeolite for Use as a Support of NH3-SCR Catalyst Mining through AICE Joint Research Project of Industries–Academia–Academia

Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 163
Author(s):  
Masaru Ogura ◽  
Yumiko Shimada ◽  
Takeshi Ohnishi ◽  
Naoto Nakazawa ◽  
Yoshihiro Kubota ◽  
...  
Keyword(s):  
High Performance ◽  
Ionic Species ◽  
Research Project ◽  
Joint Research ◽  
Structure Directing Agent ◽  
Scr Catalyst ◽  
Organic Structure ◽  
Nh3 Scr ◽  
Joint Research Project ◽  
The One

This paper introduces a joint industries–academia–academia research project started by researchers in several automobile companies and universities working on a single theme. Our first target was to find a zeolite for NH3-SCR, that is, zeolite mining. Zeolite AFX, having the same topology of SSZ-16, was found to be the one of the zeolites. SSZ-16 can be synthesized by using an organic structure-directing agent such as 1,1′-tetramethylenebis(1-azonia-4-azabicyclo[2.2.2]octane; Dab-4, resulting in the formation of Al-rich SSZ-16 with Si/Al below five. We found that AFX crystallized by use of N,N,N′,N′-tetraethylbicyclo[2.2.2]oct-7-ene-2,3:5,6-dipyrrolidinium ion, called TEBOP in this study, had the same analog as SSZ-16 having Si/Al around six and a smaller particle size than SSZ-16. The AFX demonstrated a high performance for NH3-SCR as the zeolitic support to load a large number of divalent Cu ionic species with high hydrothermal stability.

Deactivation Influence of HF on the V2O5–WO3–TiO2 SCR Catalyst

2021 ◽  
Vol 35 (5) ◽  
pp. 4377-4386
Author(s):  
Lei Deng ◽  
Zhengrong Zhu ◽  
Yikun Wang ◽  
Shihao Ma ◽  
Yan Zhang ◽  
...  
Keyword(s):  
Scr Catalyst

Integrated Dust Removal and Denitration Using a Dual-Layer Granular Bed Filter with SCR Catalyst

2020 ◽  
Vol 231 (2) ◽  
Author(s):  
Guanghui Yuan ◽  
Hongyun Wu ◽  
Guohua Yang ◽  
Yongfeng Zhu ◽  
Peng Liu ◽  
...  
Keyword(s):  
Dust Removal ◽  
Granular Bed ◽  
Scr Catalyst

scholarly journals Experimental and theoretical study of NH 3 adsorption and desorption over a Cu-chabazite NH 3 -SCR catalyst

2018 ◽  
Vol 42 (6) ◽  
pp. 1768-1780 ◽  
Author(s):  
Selmi Erim BOZBAĞ ◽  
Mutlu ŞİMŞEK ◽  
Onur DEMİR ◽  
Deniz ŞANLI YILDIZ ◽  
Hüseyin Barkın ÖZENER ◽  
...  
Keyword(s):  
Theoretical Study ◽  
Scr Catalyst ◽  
Adsorption And Desorption

TWC-SCR Aftertreatment System Evaluation for a Lean Burn Gasoline Engine Operating in HCCI, SACI, and SI Combustion Modes

2016 ◽  
Author(s):  
Jordan Easter ◽  
Stanislav V. Bohac
Keyword(s):  
Conversion Efficiency ◽  
Gasoline Engine ◽  
Fuel Efficiency ◽  
Compression Ignition ◽  
Scr Catalyst ◽  
Advanced Combustion ◽  
Nox Conversion ◽  
Combustion Modes ◽  
Scr System ◽  
Nox Conversion Efficiency

Low temperature and dilute Homogenous Charge Compression Ignition (HCCI) and Spark Assisted Compression Ignition (SACI) can improve fuel economy and reduce engine-out NOx emissions to very low values, often less than 30 ppm. However, these combustion modes are unable to achieve stringent future regulations such as SULEV 30 without the use of lean aftertreatment. Though active selective catalytic reduction (SCR) with urea injection and lean NOx traps (LNT) have been investigated as options for lean gasoline engines, a passive TWC-SCR system is investigated in this work because it avoids the urea storage and dosing hardware of a urea SCR system, and the high precious metal cost of an LNT. The TWC-SCR concept uses periodic rich operation to produce NH3 over a TWC to be stored on an SCR catalyst for subsequent NOx conversion during lean operation. In this work a laboratory study was performed with a modified 2.0 L gasoline engine that was cycled between lean HCCI and rich SACI operation, or between lean and rich SI (spark ignited) combustion, to evaluate NOx conversion and reduced fuel consumption. Different lambda values during rich operation and different times held in rich operation were investigated. Results are compared to a baseline case in which the engine is always operated at stoichiometric conditions. SCR system simulations are also presented that compare system performance for different levels of stored NH3. With the configuration used in this study, lean/rich HCCI/SACI operation showed a maximum NOx conversion efficiency of 10%, while lean/rich SI operation showed a maximum NOx conversion efficiency of 60%. However, if the low conversion efficiency of lean/rich HCCI/SACI operation could be improved through higher brick temperatures or additional SCR bricks, simulation results indicate TWC-SCR aftertreatment has the potential to provide near-zero SCR-out NOx concentration and increased system fuel efficiency. In these simulations, fuel efficiency improvement relative to stoichiometric SI were 7 to15% for lean/rich HCCI/SACI with zero tailpipe NOx and −1 to 5% for lean/rich SI with zero tailpipe NOx emissions. Although previous work indicated increased time for NH3 to start forming over the TWC during rich operation, less NH3 production over the TWC per fuel amount, and increased NH3 slip over the SCR catalyst for advanced combustion systems, if NOx conversion efficiency could be enhanced, improvements in fuel economy and low engine-out NOx from advanced combustion modes would more than make up for these disadvantages.

Heterogeneous Mercury Reaction on a Selective Catalytic Reduction (SCR) Catalyst

2007 ◽  
Vol 121 (3-4) ◽  
pp. 219-225 ◽  
Author(s):  
Yujin Eom ◽  
Seok Ho Jeon ◽  
Thanh An Ngo ◽  
Jinsoo Kim ◽  
Tai Gyu Lee
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Scr Catalyst

A Study of Engine Oil Composition Effects on Zeolite-type SCR Catalyst Durability

2007 ◽  
Author(s):  
Masahito Shibata ◽  
Hideyuki Nagata ◽  
Shigeki Takeshima ◽  
Koji Hoshino
Keyword(s):  
Engine Oil ◽  
Oil Composition ◽  
Scr Catalyst ◽  
Composition Effects ◽  
Zeolite Type ◽  
Catalyst Durability
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