Boosting the sintering resistance of platinum-alumina catalyst via a morphology-confined phosphate doping strategy

2021 ◽  
Author(s):  
Jinshi Dong ◽  
Yutao Zhang ◽  
Hongji Zou ◽  
Panpan Chang ◽  
Yan Guo
Keyword(s):  
Automotive Exhaust ◽  
Alumina Catalyst ◽  
Working Temperature ◽  
Exhaust Catalysts ◽  
Sintering Resistance

It is still a great challenge to develop robust sintering-resistant automotive exhaust catalysts due to the harsh working temperature varying from ambient to >1000 °C. Here we report a strategy...

Analytical Electron Microscopy study of two vehicle-aged automotive exhaust catalysts having dissimilar activities

1989 ◽  
Vol 47 ◽  
pp. 272-273
Author(s):  
Sooho Kim ◽  
M. J. D’Aniello
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Noble Metal ◽  
Catalyst Deactivation ◽  
Analytical Electron Microscopy ◽  
Microscopy Study ◽  
Metal Particles ◽  
Automotive Exhaust ◽  
Exhaust Catalysts ◽  
Analytical Electron

Automotive catalysts generally lose-agtivity during vehicle operation due to several well-known deactivation mechanisms. To gain a more fundamental understanding of catalyst deactivation, the microscopic details of fresh and vehicle-aged commercial pelleted automotive exhaust catalysts containing Pt, Pd and Rh were studied by employing Analytical Electron Microscopy (AEM). Two different vehicle-aged samples containing similar poison levels but having different catalytic activities (denoted better and poorer) were selected for this study.The general microstructure of the supports and the noble metal particles of the two catalysts looks similar; the noble metal particles were generally found to be spherical and often faceted. However, the average noble metal particle size on the poorer catalyst (21 nm) was larger than that on the better catalyst (16 nm). These sizes represent a significant increase over that found on the fresh catalyst (8 nm). The activity of these catalysts decreases as the observed particle size increases.

Improvement of automotive exhaust catalysts by support and electrochemical modification induced promotional effects

1997 ◽  
Vol 30 (4) ◽  
pp. 2353-2361 ◽  
Author(s):  
V.G. Papadakis ◽  
C.A. Pliangos ◽  
I.V. Yentekakis ◽  
X.E. Verykios ◽  
C.G. Vayenas
Keyword(s):  
Automotive Exhaust ◽  
Electrochemical Modification ◽  
Exhaust Catalysts

Understanding Automotive Exhaust Catalysts Using a Surface Science Approach: Model NOx Storage Materials

2013 ◽  
Vol 56 (15-17) ◽  
pp. 1420-1440 ◽  
Author(s):  
János Szanyi ◽  
Cheol Woo Yi ◽  
Kumudu Mudiyanselage ◽  
Ja Hun Kwak
Keyword(s):  
Surface Science ◽  
Nox Storage ◽  
Automotive Exhaust ◽  
Storage Materials ◽  
Exhaust Catalysts ◽  
Science Approach

Effect of Ce–Zr mixed oxides on the chemical state of Rh in alumina supported automotive exhaust catalysts studied by XPS and XRD

2001 ◽  
Vol 218 (1-2) ◽  
pp. 151-160 ◽  
Author(s):  
S. Suhonen ◽  
M. Valden ◽  
M. Hietikko ◽  
R. Laitinen ◽  
A. Savimäki ◽  
...  
Keyword(s):  
Mixed Oxides ◽  
Chemical State ◽  
Automotive Exhaust ◽  
Exhaust Catalysts

Direct determination of Pd, Pt and Rh in fire assay lead buttons by laser ablation-ICP-OES: automotive exhaust catalysts as an example

2011 ◽  
Vol 26 (8) ◽  
pp. 1679 ◽  
Author(s):  
Sien Compernolle ◽  
Dorine Wambeke ◽  
Ine De Raedt ◽  
Kristof Kimpe ◽  
Frank Vanhaecke
Keyword(s):  
Laser Ablation ◽  
Direct Determination ◽  
Icp Oes ◽  
Automotive Exhaust ◽  
Fire Assay ◽  
Exhaust Catalysts ◽  
In Fire

Numerical Modeling of Automotive Exhaust Catalysts

2011 ◽  
Author(s):  
Masayuki Kato ◽  
Takaki Matsumoto ◽  
Shinichiro Otsuka ◽  
Hirosuke Okubo ◽  
Yoshiaki Matsuzono ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Automotive Exhaust ◽  
Exhaust Catalysts
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