CO oxidation over palladium- and sodium-promoted tin dioxide: catalyst characterization and temperature-programmed studies

Date

2005-03-18

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

78
views

0
downloads

One weight percentage PdO/SnO2 and 0.1 wt.% Na-1 wt.% PdO/SnO2 catalysts have been synthesized through a sol-gel route and these catalysts have been characterized by XRD, BET, SEM and temperature-programmed adsorption and desorption techniques with regard to their activity for the CO oxidation reaction. CO adsorption and CO-O-2 co-adsorption followed by O-2 TPD have been carried out to observe the role of sodium promotion on the catalytic activity. The catalytic activity of PdO/SnO2 catalysts is suppressed by blockage of CO active sites by O-2 on co-adsorbed catalysts. Sodium-promoted catalysts possess increased affinity to oxygen and thus, exhibit superior activity Upon CO-O-2 co-adsorption, but these catalysts have been observed to perform poorly upon consecutive adsorption of CO and O-2. The effect has been ascribed to enhanced interaction of sodium-promoted surfaces with CO hindering oxygen adsorption on CO precovered surface.

Subject Keywords

Process Chemistry and Technology, Catalysis

URI

https://hdl.handle.net/11511/35890

Journal

APPLIED CATALYSIS A-GENERAL

DOI

https://doi.org/10.1016/j.apcata.2004.11.036

Collections

Department of Chemical Engineering, Article

Suggestions

OpenMETU
Core

Water soluble laurate-stabilized rhodium(0) nanoclusters catalyst with unprecedented catalytic lifetime in the hydrolytic dehydrogenation of ammonia-borane Durap, Feyyaz; Zahmakiran, Mehmet; Özkar, Saim (Elsevier BV, 2009-11-15) Herein we report, for the first time, the preparation and characterization of water soluble rhodium(0) nanoclusters stabilized by laurate (dodecanoate) anion and their catalytic activity in the hydrolysis of ammonia-borane. The water soluble laurate-stabilized rhodium(0) nanoclusters were prepared from the reduction of rhodium(III) chloride by dimethylamine-borane in solution containing sodium laurate at room temperature. The water soluble laurate-stabilized rhodium(0) nanoclusters in average size of 5.2 +/...
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 ...
Processing and properties of modified polyamide 66-organoclay nanocomposites Mert, Miray; Yılmazer, Ülkü (Wiley, 2008-06-15) Binary polyamide 66 nanocomposites containing 2 wt % organoclay, polyamide 66 blend containing 5 wt % impact modifier, and ternary polyamide 66 nanocomposites containing 2 wt % organoclay and 5 wt % impact modifier were prepared by melt compounding method. The effects of E-GMA and the types of the organoclays on the interaction between the organoclay and the polymer, dispersion of the organoclay, morphology, mechanical, flow, and thermal properties of the nanocomposites were investigated. Partial exfoliatio...
Co-combustion of olive cake with lignite coal in a circulating fluidized bed Atımtay, Aysel (Elsevier BV, 2004-05-01) In this study, olive cake (OC) was co-fired with coal in a circulating fluidized bed of 125 mm diameter and 1800 mm height. Olive cake is a waste from olive oil production. A lignite coal that is most widely used in Turkey (Tuncbilek lignite) was used together with OC and the combustion characteristics of olive cake (OC) + coal mixture were investigated. The combustion experiments were carried out with various excess air ratios. The excess air ratio, A, has been changed between 1.1 and 2.16. Temperature dis...
Dry grinding kinetics of binary mixtures of ceramic raw materials by Bond milling Ipek, H; Ucbas, Y; Yekeler, M; Hoşten, Çetin (Elsevier BV, 2005-01-01) The kinetics of batch dry grinding of binary mixtures of ceramic raw materials, namely quartz-kaolin, quartz-potassium feldspar and kaolin-potassium feldspar, from the feed sizes of -3.350 + 2.360, -2.000 + 1.400, -0.850 + 0.600, -0.500 + 0.355 and -0.300 + 0.212 mm have been determined using a Bond mill with a mixture of ball sizes of 38.10, 31.75, 25.40, 19.05 and 12.70 mm diameter and total mass of 22.648 kg. The Bond mill used was a size of 30.5 cm diameter, 30.5 cm length, with a total volume of 22,272...

Citation Formats

B. MİRKELAMOĞLU and G. Karakaş, “CO oxidation over palladium- and sodium-promoted tin dioxide: catalyst characterization and temperature-programmed studies,” APPLIED CATALYSIS A-GENERAL, pp. 275–284, 2005, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/35890.