scholarly journals The Role of Defects in the Local Reaction Kinetics of CO Oxidation on Low-Index Pd Surfaces

2013 ◽  
Vol 117 (23) ◽  
pp. 12054-12060 ◽  
Author(s):  
D. Vogel ◽  
C. Spiel ◽  
M. Schmid ◽  
M. Stöger-Pollach ◽  
R. Schlögl ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Reaction Kinetics ◽  
Local Reaction ◽  
Kinetics Of

White Beam Synchrotron Topographic Studies of the Effects of Localized Stress Fields on the Kinetics of Single Crystal Solid State Reactions.

1988 ◽  
Vol 143 ◽  
Author(s):  
Michael Dudley
Keyword(s):  
Solid State ◽  
Reaction Kinetics ◽  
Local Reaction ◽  
Stress Fields ◽  
Solid State Reactions ◽  
Thermally Induced ◽  
White Beam ◽  
Kinetics Of ◽  
Good Agreement

AbstractWhite Beam Synchrotron Topography has been used to determine the role of localized stress fields in the solid state polymerization of single crystals of the diacetylene PTS. Results indicate that the stress fields due to grown in dislocations can accelerate local reaction kinetics in thermally induced polymerization reactions, although no such effects were previously observable in photolytically or radiolytically induced reactions. Results are analyzed in an analogous fashion to the treatment of the nucleation of solid state phase transformations at dislocations. Good agreement was found between approximate theoretical treatments and experimental observation. The response of the monomer crystal to the inhomogeneous stresses generated as a result of inhomogeneous reaction and the implications regarding local reaction kinetics are discussed in detail.

On the Role of Diffusion in the Oxidation of Fe, Ni, Co and the Fe-Sn Alloy by Calcium and Sodium Sulfates

2006 ◽  
Vol 258-260 ◽  
pp. 63-67
Author(s):  
V.M. Chumarev ◽  
V.P. Maryevich ◽  
V.A. Shashmurin
Keyword(s):  
Co Oxidation ◽  
Chemical Reaction ◽  
Diffusion Processes ◽  
Transport Processes ◽  
Diffusion Transport ◽  
Sodium Sulfates ◽  
Product Forms ◽  
Kinetics Of ◽  
Dominant Part

Diffusion processes play a dominant part in the macro kinetics of Fe, Ni and Co oxidation by calcium and sodium sulfates. Here, the reaction product forms a compact covering which spatially divides the reagents on the surface in the same way as in the oxidation and sulfidization of metals by oxygen and sulfur. Therefore, it is possible to assume in advance that interaction of metals with calcium and sodium sulfates will be determined not by the actual chemical reaction properly but by the diffusion transport processes.

scholarly journals Cover Picture: Local Reaction Kinetics by Imaging: CO Oxidation on Polycrystalline Platinum (ChemPhysChem 15/2010)

ChemPhysChem ◽  
2010 ◽  
Vol 11 (15) ◽  
pp. 3185-3185
Author(s):  
Yuri Suchorski ◽  
Christian Spiel ◽  
Diana Vogel ◽  
Wolfgang Drachsel ◽  
Robert Schlögl ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Reaction Kinetics ◽  
Local Reaction ◽  
Polycrystalline Platinum

Steady-state reaction kinetics of CO oxidation catalyzed by uni-sized Pt30 clusters directly bound to Si surface

2016 ◽  
Vol 6 (18) ◽  
pp. 6910-6915 ◽  
Author(s):  
H. Yasumatsu ◽  
N. Fukui
Keyword(s):  
Steady State ◽  
Low Temperature ◽  
Co Oxidation ◽  
Reaction Kinetics ◽  
Co Poisoning ◽  
Si Substrate ◽  
Catalytic Co Oxidation ◽  
Kinetics Of

Catalytic CO oxidation driven by uni-sized Pt30 bound to a Si substrate, at the interface of which electrons are accumulated. The low-temperature and anti-CO-poisoning performance has been evidenced with continuous and simultaneous supply of CO and O2.

Energy dependent transient reaction kinetics of CO oxidation on Pd{1 1 0}

2001 ◽  
Vol 482-485 ◽  
pp. 147-152 ◽  
Author(s):  
M Hirsimäki ◽  
P Nieminen ◽  
M Valden
Keyword(s):  
Co Oxidation ◽  
Reaction Kinetics ◽  
Energy Dependent ◽  
Kinetics Of

Role of functional groups in reaction kinetics of dithiothreitol with secondary organic aerosols

2020 ◽  
Vol 263 ◽  
pp. 114402 ◽  
Author(s):  
Huanhuan Jiang ◽  
C.M. Sabbir Ahmed ◽  
Zixu Zhao ◽  
Jin Y. Chen ◽  
Haofei Zhang ◽  
...  
Keyword(s):  
Reaction Kinetics ◽  
Functional Groups ◽  
Secondary Organic Aerosols ◽  
Organic Aerosols ◽  
Kinetics Of

Role of CO2 methanation into the kinetics of preferential CO oxidation on Cu/Co3O4

2019 ◽  
Vol 466 ◽  
pp. 167-180 ◽  
Author(s):  
Satyapaul A. Singh ◽  
Suhas Mukherjee ◽  
Giridhar Madras
Keyword(s):  
Co Oxidation ◽  
Co2 Methanation ◽  
Preferential Co Oxidation ◽  
Kinetics Of

scholarly journals Catalysis by Imaging: From Meso- to Nano-scale

2020 ◽  
Vol 63 (15-18) ◽  
pp. 1532-1544 ◽  
Author(s):  
Yuri Suchorski ◽  
Günther Rupprechter
Keyword(s):  
Co Oxidation ◽  
Reaction Kinetics ◽  
Surface Structure ◽  
Local Reaction ◽  
Model Systems ◽  
Image Intensity ◽  
Nano Scale ◽  
Kinetic Transitions ◽  
Local Image

AbstractIn-situ imaging of catalytic reactions has provided insights into reaction front propagation, pattern formation and other spatio-temporal effects for decades. Most recently, analysis of the local image intensity opened a way towards evaluation of local reaction kinetics. Herein, our recent studies of catalytic CO oxidation on Pt(hkl) and Rh(hkl) via the kinetics by imaging approach, both on the meso- and nano-scale, are reviewed. Polycrystalline Pt and Rh foils and nanotips were used as µm- and nm-sized surface structure libraries as model systems for reactions in the 10–5–10–6 mbar pressure range. Isobaric light-off and isothermal kinetic transitions were visualized in-situ at µm-resolution by photoemission electron microscopy (PEEM), and at nm-resolution by field emission microscopy (FEM) and field ion microscopy (FIM). The local reaction kinetics of individual Pt(hkl) and Rh(hkl) domains and nanofacets of Pt and Rh nanotips were deduced from the local image intensity analysis. This revealed the structure-sensitivity of CO oxidation, both in the light-off and in the kinetic bistability: for different low-index Pt surfaces, differences of up to 60 K in the critical light-off temperatures and remarkable differences in the bistability ranges of differently oriented stepped Rh surfaces were observed. To prove the spatial coherence of light-off on nanotips, proper orthogonal decomposition (POD) as a spatial correlation analysis was applied to the FIM video-data. The influence of particular configurations of steps and kinks on kinetic transitions were analysed by using the average nearest neighbour number as a common descriptor. Perspectives of nanosized surface structure libraries for future model studies are discussed.

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