Selective Catalytic Reduction of NOxin Lean Burn Engine Exhaust by Highly Active Pt Supported on V-impregnated MCM-41

2002 ◽  
Vol 31 (2) ◽  
pp. 246-247 ◽  
Author(s):  
Jong Yeol Jeon ◽  
Hee Young Kim ◽  
Seong Ihl Woo
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Lean Burn ◽  
Engine Exhaust ◽  
Highly Active ◽  
Mcm 41

Effect of Engine Exhaust Parameters on the Hydrothermal Stability of Hydrocarbon-Selective Catalytic Reduction (SCR) Catalysts for Lean-Burn Systems

2012 ◽  
Vol 26 (12) ◽  
pp. 7084-7091 ◽  
Author(s):  
Preshit Gawade ◽  
Anne-Marie C. Alexander ◽  
Ronald Silver ◽  
Umit S. Ozkan
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Hydrothermal Stability ◽  
Lean Burn ◽  
Engine Exhaust ◽  
Scr Catalysts

scholarly journals Experimental Assessment of an Electrofilter and a Tandem Positive-Negative Corona Charger for the Measurement of Charged Nanoparticles formed in Selective Catalytic Reduction Systems

2019 ◽  
Vol 9 (6) ◽  
pp. 1051 ◽  
Author(s):  
Matthias Schwelberger ◽  
Athanasios Mamakos ◽  
Martin Fierz ◽  
Barouch Giechaskiel
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Charged Particles ◽  
Passenger Cars ◽  
Engine Exhaust ◽  
Condensation Particle Counter ◽  
Measurement Systems ◽  
Charged Nanoparticles ◽  
Technical Solutions ◽  
Volatile Particle

Onboard measurement of non-volatile particle number (PN) emissions with portable emissions measurement systems (PEMS) was introduced for the type-approval of passenger cars in Europe since 2017 and is foreseen for heavy-duty (HD) vehicles in 2021. First studies on the performance of PN-PEMS with HD engine exhaust revealed larger differences between established PN-PEMS techniques than what was observed for passenger cars. Particles forming in selective catalytic reduction (SCR) systems for NOx of late technology HD engines have recently been identified as a potential reason for the observed differences. The formed particles have a size distribution peaking below the regulatory limit of 23 nm and most importantly acquire high (more than one) positive charges at the elevated exhaust temperatures. Precise measurement of such highly charged nanosized particles with PN-PEMS instrumentation utilizing diffusion charger (DC) based counters requires proper conditioning of these charges. Two approaches were investigated in this study: (a) an electrofilter (EF) to completely remove charged particles below the regulated size and (b) a tandem negative-positive corona (TC) charger to directly condition pre-charged particles. The two technical solutions were tested alongside the unmodified DC-based PN-PEMS, a PN-PEMS utilizing a condensation particle counter (CPC) and a reference stationary PN system using exhaust of two SCR-equipped HD engines. The results confirmed that the particles forming in such SCR systems are responsible for the observed inconsistencies and that both technical solutions efficiently address the interferences of these pre-charged nanoparticles.

The dual effects of ammonium bisulfate on the selective catalytic reduction of NO with NH3 over Fe2O3-WO3 catalyst confined in MCM-41

2020 ◽  
Vol 389 ◽  
pp. 124271 ◽  
Author(s):  
Kai Guo ◽  
Yuxiang Zhu ◽  
Zhen Yan ◽  
Annai Liu ◽  
Xiangze Du ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Reduction Of No ◽  
Ammonium Bisulfate ◽  
Mcm 41
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