Investigation of the CO oxidation rate oscillations using electrochemical promotion of catalysis over sputtered-Pt films interfaced with YSZ

2010 ◽  
Vol 12 (10) ◽  
pp. 1310-1313 ◽  
Author(s):  
L. Lizarraga ◽  
S. Souentie ◽  
L. Mazri ◽  
A. Billard ◽  
P. Vernoux
Keyword(s):  
Co Oxidation ◽  
Oxidation Rate ◽  
Electrochemical Promotion ◽  
Rate Oscillations ◽  
Electrochemical Promotion Of Catalysis ◽  
Pt Films

Electrochemical promotion of catalytic CO oxidation on Pt/YSZ catalysts under low pressure conditions

1999 ◽  
Vol 1 (22) ◽  
pp. 5241-5249 ◽  
Author(s):  
Jens Poppe ◽  
Stefan Völkening ◽  
Andreas Schaak ◽  
Eckart Schütz ◽  
Jürgen Janek ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Electrochemical Promotion ◽  
Low Pressure ◽  
Catalytic Co Oxidation

scholarly journals Electropositive Promotion by Alkalis or Alkaline Earths of Pt-Group Metals in Emissions Control Catalysis: A Status Report

Catalysts ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 157 ◽  
Author(s):  
Ioannis V. Yentekakis ◽  
Philippe Vernoux ◽  
Grammatiki Goula ◽  
Angel Caravaca
Keyword(s):  
Cost Effective ◽  
Electrochemical Promotion ◽  
Catalytic Performance ◽  
Effective Control ◽  
Status Report ◽  
Alkaline Earths ◽  
Reduction Of Nox ◽  
Electrochemical Promotion Of Catalysis ◽  
Novel Catalyst ◽  
Combustion Processes

Recent studies have shown that the catalytic performance (activity and/or selectivity) of Pt-group metal (PGM) catalysts for the CO and hydrocarbons oxidation as well as for the (CO, HCs or H2)-SCR of NOx or N2O can be remarkably affected through surface-induced promotion by successful application of electropositive promoters, such as alkalis or alkaline earths. Two promotion methodologies were implemented for these studies: the Electrochemical Promotion of Catalysis (EPOC) and the Conventional Catalysts Promotion (CCP). Both methodologies were in general found to achieve similar results. Turnover rate enhancements by up to two orders of magnitude were typically achievable for the reduction of NOx by hydrocarbons or CO, in the presence or absence of oxygen. Subsequent improvements (ca. 30–60 additional percentage units) in selectivity towards N2 were also observed. Electropositively promoted PGMs were also found to be significantly more active for CO and hydrocarbons oxidations, either when these reactions occur simultaneously with deNOx reactions or not. The aforementioned direct (via surface) promotion was also found to act synergistically with support-mediated promotion (structural promotion); the latter is typically implemented in TWCs through the complex (Ce–La–Zr)-modified γ-Al2O3 washcoats used. These attractive findings prompt to the development of novel catalyst formulations for a more efficient and cost-effective control of the emissions of automotives and stationary combustion processes. In this report the literature findings in the relevant area are summarized, classified and discussed. The mechanism and the mode of action of the electropositive promoters are consistently interpreted with all the observed promoting phenomena, by means of indirect (kinetics) and direct (spectroscopic) evidences.

scholarly journals Electrochemical Promotion of Catalysis

2002 ◽  
Vol 56 (4) ◽  
pp. 137-142 ◽  
Author(s):  
György Fóti ◽  
Ivan Bolzonella ◽  
Justyna Eaves ◽  
Christos Comninellis
Keyword(s):  
Electrochemical Promotion ◽  
Electrochemical Promotion Of Catalysis
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