Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Mechanisms of CO oxidation reaction and effect of chlorine ions on the CO oxidation reaction over Pt/CeO2 and Pt/CeO2/gamma-Al2O3 catalysts
Date
2004-12-20
Author
Oran, U
Üner, Deniz
Metadata
Show full item record
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
Item Usage Stats
257
views
0
downloads
Cite This
The reaction orders and activation energies of CO oxidation reaction over Pt/gamma-Al2O3, Pt/CeO2 and Pt/CeO2/Y-Al2O3 were investigated for stoichiometric gas mixtures. The effect of residual chlorine originating from catalyst precursors on the CO oxidation activity of Pt/gamma-Al2O3, Pt/CeO2 and Pt/CeO2/gamma-Al2O3 was also studied. Indirect evidence was collected indicating that platinum was selectively deposited on alumina surface when Pt/CeO2/gamma-Al2O3 catalyst was prepared from the physical mixture of pure oxides. The reaction orders of CO and O-2 was found approximately as -2.0 and +1.0, respectively, over the Pt/gamma-Al2O3 catalyst, but as -1.0 and 0.0 over the Pt/CeO2 and Pt/CeO2/gamma-Al2O3 catalysts. The activation energy of CO oxidation reaction over Pt/gamma-Al2O3 catalyst under stoichiometric conditions was around 120.0 kJ/mol. On the other hand, over Pt/CeO2 catalysts activation energies were measured to be around 70 kJ/mol. Surface reaction mechanisms were postulated to explain the differences in the reaction orders and activation energies.
Subject Keywords
Process Chemistry and Technology
,
General Environmental Science
,
Catalysis
URI
https://hdl.handle.net/11511/34562
Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
DOI
https://doi.org/10.1016/j.apcatb.2004.06.011
Collections
Department of Chemical Engineering, Article
Suggestions
OpenMETU
Core
Effect of hydrogen ion-exchange capacity on activity of resin catalysts in tert-amyl-ethyl-ether synthesis
Boz, N; Doğu, Timur; Murtezaoglu, K; Dogu, G (Elsevier BV, 2004-08-10)
Activities of ion-exchange resin catalysts, having different hydrogen exchange capacities ranging between 5.1 and 1.3 meq H+/g, on the etherification reactions of 2M1B (2-methyl-1-butene) and 2M2B (2-methyl-2-butene) with ethanol were experimentally tested in a fixed bed reactor. These catalysts were prepared by the heat treatment of Amberlyst-15 catalysts at 220 degreesC at different durations of time and also by the synthesis of sulfonated styrene divinyl benzene cross-linked resins. Activity of these cat...
Intrazeolite cobalt(0) nanoclusters as low-cost and reusable catalyst for hydrogen generation from the hydrolysis of sodium borohydride
Rakap, Murat; Özkar, Saim (Elsevier BV, 2009-09-07)
Intrazeolite cobalt(0) nanoclusters were prepared by ion-exchange of Co2+ ions with the extraframework Na+ ions in the zeolite-Y followed by the reduction of Co2+ ions in the supercages of zeolite-Y with sodium borohydride at room temperature. The intrazeolite cobalt(0) nanoclusters were isolated as solid materials and characterized by ICP-OES, XRD, HRTEM, SEM, XPS, Raman spectroscopy and N-2 adsorption technique. The catalytic activities of intrazeolite cobalt(0) nanoclusters in the hydrolysis reaction of ...
Hydroxyapatite supported ruthenium(0) nanoparticles catalyst in hydrolytic dehydrogenation of ammonia borane: Insight to the nanoparticles formation and hydrogen evolution kinetics
Akbayrak, Serdar; Erdek, Pelin; Özkar, Saim (Elsevier BV, 2013-10-01)
When a solution of ammonia borane is added to the suspension of ruthenium(III) ions supported on hydroxyapatite, both reduction of ruthenium(III) to ruthenium(0) nanoparticles and hydrogen release from the hydrolysis of ammonia borane occur concomitantly at room temperature. Using the hydrogen evolution from the hydrolysis of ammonia borane as reporter reaction provides valuable insights to the formation kinetics of ruthenium(0) nanoparticles. Thus, the rate constants for the slow nucleation and autocatalyt...
Rhodium(0) nanoparticles supported on nanosilica: Highly active and long lived catalyst in hydrogen generation from the methanolysis of ammonia borane
Ozhava, Derya; Özkar, Saim (Elsevier BV, 2016-02-01)
Nanosilica stabilized rhodium(0) nanoparticles (Rh(0)/nanoSiO(2)), in situ formed from the reduction of rhodium(II) octanoate impregnated on the surface of nanosilica, are active catalyst in hydrogen generation from the methanolysis of ammonia borane at room temperature. Monitoring the hydrogen evolution enables us to follow the kinetics of nanoparticles formation. The resulting sigmoidal kinetic curves are analyzed by using the 2-step mechanism of the slow, continuous nucleation and autocatalytic surface g...
The role of alkali-metal promotion on CO oxidation over PdO/SnO2 catalysts
MİRKELAMOĞLU, BURCU; Karakaş, Gürkan (Elsevier BV, 2006-01-17)
Sol-gel prepared PdO/SnO2 and Na-PdO/SnO2 catalysts were investigated by X-ray photoelectron spectroscopy (XPS), diffuse reflectance IR (DRIFTS), temperature-programmed reaction spectroscopy (TPRS) and impulse techniques. Alkali-metal promotion was observed to enhance CO oxidation rate and decreases light-off temperatures of PdO/SnO, XPS analysis revealed that alkali-metal promotion resulted in the segregation of Pd atoms and promoted the oxygen storage capacity of the catalysts. The presence of super-oxide...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
U. Oran and D. Üner, “Mechanisms of CO oxidation reaction and effect of chlorine ions on the CO oxidation reaction over Pt/CeO2 and Pt/CeO2/gamma-Al2O3 catalysts,”
APPLIED CATALYSIS B-ENVIRONMENTAL
, pp. 183–191, 2004, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/34562.