Kinetics of hydrogen adsorption and Desorption on silica-supported Pt, Rh, and Ru catalysts studied by solid state H-1 NMR

Date

2002-05-14

Author

Savargaonkar, N
Üner, Deniz
Pruski, M
King, TS

Metadata

Show full item record

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

Item Usage Stats

212
views

0
downloads

The kinetics of adsorption and desorption of hydrogen on the multifaceted surfaces of silica-supported Pt, Rh, and Ru catalysts were studied by means of solid state H-1 NMR. Experiments with selective inversion of 1H magnetization and the formalism developed by Engelke et al. [J. Chem. Phys. 1994, 101 (9), 7262] were used to extract the adsorption and desorption rate constants and the apparent sticking coefficient. The sticking coefficients of hydrogen measured at 333 K at a surface coverage of 0.4 over 5% Pt/SiO2, 4% Ru/SiO2, and 3% Rh/SiO2 were determined to be 0.014, 0.12, and 0.52, respectively. The corresponding activation energies for desorption were 66, 43, and 79 kJ/mol, respectively.

Subject Keywords

Fischer-tropsch synthesis, Alkali promoters, Ru/sıo2 surfaces, Carbon-monoxide, Metal-catalysts, Ruthenıum, Chemisorption, Nı(111), Rh(111), Model

URI

https://hdl.handle.net/11511/36809

Journal

LANGMUIR

DOI

https://doi.org/10.1021/la0157263

Collections

Department of Chemical Engineering, Article

Suggestions

OpenMETU
Core

Kinetics of polyurethane formation between glycidyl azide polymer and a triisocyanate Keskin, S; Özkar, Saim (Wiley, 2001-07-25) Kinetics of the polyurethane formation between glycidyl azide polymer (GAP) and a polyisocyanate, Desmodur N-100, were studied in the bulk state by using quantitative FTIR spectroscopy. The reaction was followed by monitoring the change in intensity of the absorption band at 2270 cm-l for NCO stretching in the IR spectrum, and was shown to obey second-order kinetics up to 50% conversion. The activation parameters were obtained from the evaluation of kinetic data at different temperatures in the range of 50-...
Catalytic oxidation of nitrogen containing compounds for nitrogen determination Karakaş, Gürkan (2019-02-15) The high temperature catalytic oxidation (HTCO) performance of Al2O3 supported Pt, Cu, Cu-Ce and Fe catalysts were systematically studied with a perspective of selective oxidation of nitrogenous compounds to nitric oxide for quantitative determination of bound nitrogen. The catalyst samples were prepared via impregnation and characterized by XRD and BET. In addition, temperature programmed reaction experiments with acetonitrile and oxygen were conducted to evaluate the catalytic activity and selectivity tow...
Kinetics of fcc-Al nanocrystallization in Al90Tb10 metallic glass DEMIRTAS, T.; Kalay, Yunus Eren (Elsevier BV, 2013-10-15) The crystallization kinetics of Al90Tb10 amorphous alloy were investigated by a combined study of differential scanning calorimetry (DSC), transmission electron microscopy (TEM), Cu-K alpha X-ray diffraction (XRD) analyses and microhardness measurements. Amorphous to fcc-Al transformation kinetics were descried through Johnson-Mehl-Avrami OMA) approach based on the isothermal DSC hold at 220 degrees C. XRD and TEM revealed the formation of highly populated (similar to 10(21) m(-3)) fcc-Al nanocrystals after...
Kinetics of H2S sorbtion on manganese oxide and Mn-Fe-Cu mixed oxide prepared by the Complexation Technique Caglayan, P; Yasyerli, S; Ar, I; Dogu, G; Doğu, Timur (2006-04-02) Hydrogen sulfide sorption activities of manganese oxide and Mn-Fe-Cu mixed oxide sorbents were examined in a fixed bed reactor. Sulfur retention capacity of Mn-O sorbent was found to be quite high at 600 degrees C both in the absence and presence of hydrogen gas (0.17 and 0.14 g S/g sorbent, respectively). This sorbent has a high porosity and a relatively high surface area. Best regeneration temperature of this sorbent was found as 700 degrees C, with a gas stream containing 6% oxygen in nitrogen. Mn-Fe-Cu ...
Synthesis, characterization, and polymerization of polyether bridged thiophene and aniline derivatives Tirkeş, Seha; Önal, Ahmet Muhtar; Department of Polymer Science and Technology (2008) New compounds consisting of 3-thienyl and aniline units linked by polyether bridges have been synthesized and their electrochemical polymerization was performed via constant potential electrolysis and cyclic voltammetry. In the case of 3-thienyl derivatives two compounds, 1,12-di-3-thienyl-2,5,8,11-tetraoxadodecane (MI) and 1,15-di-3-thienyl-2,5,8,11,14-pentaoxapentadecane (MII) were synthesized utilizing literature methods and their corresponding polymers, poly(I) and poly(II) were prepared in an electroly...

Citation Formats

N. Savargaonkar, D. Üner, M. Pruski, and T. King, “Kinetics of hydrogen adsorption and Desorption on silica-supported Pt, Rh, and Ru catalysts studied by solid state H-1 NMR,” LANGMUIR, pp. 4005–4009, 2002, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/36809.