Low temperature oxidation of carbon monoxide over alkali-metal promoted palladium-tin oxide catalysts

Date

2005-09-17

Author

MİRKELAMOĞLU, Burcu
Karakaş, Gürkan

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

183
views

0
downloads

The CO oxidation activity of sol-gel prepared tin dioxide based palladium and sodium-palladium promoted catalysts were investigated by XRD, XPS, DRIFTS and temperature programmed desorption techniques. XPS data suggests that alkali-metal promotion results in the formation of super-oxide species and promotes the surface segregation of Pd atoms, increasing the number of active sites for CO adsorption/oxidation. The formation of a ternary oxide of sodium and palladium is Postulated. Through sub-ambient TPD experiments, the noble metal promoted catalysts have been identified to exhibit CO oxidation activity below ambient temperature. Steady-state CO conversion and rate of reaction data revealed that improvements in the CO oxidation activity of palladized tin dioxide could be achieved under both oxygen-rich and oxygen-lean conditions by sodium-promotion of the catalyst.

Subject Keywords

Alkali-metal promotion, Tin dioxide catalysts, CO oxidation, Temperature-programmed characterization

URI

https://hdl.handle.net/11511/42721

DOI

https://doi.org/10.1007/1-4020-4741-x_32

Collections

Department of Chemical Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

Low-temperature oxidation reactions of crude oils using TGA-DSC techniques Kök, Mustafa Verşan; Nurgaliev, Danis K. (Springer Science and Business Media LLC, 2020-07-01) In this research, combustion behaviour of three crude oils with different degrees API gravities was analysed. The thermogravimetric analyser (TGA) and differential scanning calorimeter (DSC) experiments were performed using three different heating rates (2, 5, and 10 degrees C min(-1)) under air atmosphere. The reaction regions, burn-out temperatures, and peak temperatures were determined accordingly. Two main reaction regions, particularly the low-temperature oxidation (LTO) and high-temperature oxidation ...
Low temperature thermoluminescence behaviour of Y2O3 nanoparticles Delice, S.; IŞIK, MEHMET; Hasanlı, Nızamı (2019-01-01) Y2O3 nanoparticles were investigated using low temperature thermoluminescence (TL) experiments. TL glow curve recorded at constant heating rate of 0.4 K/s exhibits seven peaks around 19, 62, 91, 115, 162, 196 and 215 K. Activation energies and characteristics of traps responsible for observed curves were revealed under the light of results of initial rise analyses and T-max-T-stop experimental methods. Analyses of TL curves obtained at different stopping temperatures resulted in presence of one quasi-contin...
Characterization of degradation products of polyethylene oxide by pyrolysis mass spectrometry Fares, M.M.; Hacaloğlu, Jale; Suzer, S. (1994-01-01) The techniques of direct and indirect (evolved gas analysis) pyrolysis MS are used to characterize the thermal degradation products of polyethylene oxide. Using direct pyrolysis MS technique the main degradation process is determined to be due to C~ and C~C scissions yielding fragments characteristic of the polymer. Evolved gas analysis indicates formation of small molecular stable compounds such as C2H•OCzH 5, CH3CHO, CO,, CO and C2H 4.
Selective oxidation of H2S to elemental sulfur over Ce-V mixed oxide and CeO2 catalysts prepared by the complexation technique Yasyerli, Sena; Dogu, Gulsen; Doğu, Timur (2006-09-30) Selective oxidation of H2S to elemental sulfur was investigated in a fixed bed reactor using Ce-V mixed oxides and cerium oxide (CeO2) catalytic materials prepared by the complexation technique. The Ce-V mixed oxide with a V/Ce atomic ratio of one and with the CeVO4 crystal structure gave very high sulfur selectivity values (close to one) at almost complete conversion of H2S, for O-2/H2S mote ratios close to 0.5. Best operation temperature was found as 250 degrees C with this catalyst. CeO2 gave lower selec...
Low temperature thermoluminescence study of some ternary and quaternary layered structured semiconductors Delice, Serdar; Hasanlı, Nızamı; Department of Physics (2016) Thermoluminescence (TL) experiments for ternary and quaternary layered single crystals were carried out in 10−300 K temperature range by employing various heating rates between 0.2 and 1.2 K/s. The TL emissions coming from the trapping centers in the studied samples brought out the TL spectra exhibiting peaks at different temperature regions for each crystals. These peaks were taken under consideration to reveal the TL properties of the associated trap levels. Characterizations of defect centers existing in...

Citation Formats

B. MİRKELAMOĞLU and G. Karakaş, “Low temperature oxidation of carbon monoxide over alkali-metal promoted palladium-tin oxide catalysts,” 2005, vol. 228, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/42721.