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2 edition of chemisorption decomposition, and oxidation of methanol on clean metal surfaces. found in the catalog.

chemisorption decomposition, and oxidation of methanol on clean metal surfaces.

Thomas Ian Stewart

chemisorption decomposition, and oxidation of methanol on clean metal surfaces.

by Thomas Ian Stewart

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  • 27 Currently reading

Published in Bradford .
Written in English


Edition Notes

Ph.D. thesis. Typescript.

SeriesTheses
The Physical Object
Pagination1 vol
ID Numbers
Open LibraryOL13728656M

Kinetic and Spectroscopic Investigations of Surface Chemical Processes.- Experimental Methods.- Kinetic Studies of Methanol Decomposition on Ni{}.- Isothermal Decomposition of Methanol on Clean Ni{}.- Steady-State Kinetics of Methanol Decomposition on Ni {}.- Scanning Kinetic Spectroscopy (SKS) Methods for. Tanya Tsoncheva's 74 research works with 1, citations and 3, reads, including: Synthesis and characterization of copper-nickel ferrite catalysts for ethyl acetate oxidation.

  A main obstacle in the rational development of heterogeneous catalysts is the difficulty in identifying active sites. Here we show metal/oxide interfacial sites are highly active for the oxidation. catalysis,1–3 corrosion,4,5 and high temperature oxidation.6,7 Surface oxidation also plays a crucial role in copper catalysis such as synthesis of methanol,8 electroless plating,9 and fuel cell electrodes The typical reaction sequence of the surface oxidation of single crystals of copper proceeds according to the following steps.

Flash Decomposition from the Clean Surface and Flash Desorption of Reaction Products," J. Catal. 30 () Robert J. Madix, John Falconer and Jon McCarty, "Surface Microcatalysis: The Enhanced Selectivity of Ni() (4x5)C for Dehydrogenation of Formic Acid," J. Catal. 31 ()   @article{osti_, title = {Palladium catalysts synthesized by atomic layer deposition for methanol decomposition.}, author = {Elam, J W and Feng, H and Stair, P C and Libera, J A and Setthapun, W and Northwestern Univ.}, abstractNote = {Atomic layer deposition (ALD) palladium films were deposited at C on various ALD metal oxide surfaces using sequential exposures to Pd(II.


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Chemisorption decomposition, and oxidation of methanol on clean metal surfaces by Thomas Ian Stewart Download PDF EPUB FB2

Mechanistic Insights on Sulfide-Adsorption Enhanced Activity of Methanol Electro-Oxidation on Pt Nanoparticles. ACS Catalysis2 (1), DOI: /csf. Dominic R. Alfonso. Computational Studies of Experimentally Observed Structures of Sulfur on Metal by:   Surface Science () orth-Holland Publishing Company METHANOL DECOMPOSITION ON PLATINUM () Brett A.

SEXTON * Physical Chemistry Department, General Motors Research Laboratories, Warren, MichiganUSA Received 24 June The interaction ofmethanol with clean and oxygen-covered Pt(lll) surfaces has been exam- ined with high resolution Cited by:   Surface Science () North-Holland, Amsterdam THE ADSORPTION AND REACTIONS OF METHANOL ON CLEAN AND OXIDISED ALUMINIUM SURFACES lan F.

TINDALL and John C. VICKERMAN Department of Chemistry, U M 1ST, Sack ville Street, Manchester M 60 IQ D, UK Received 19 June ; accepted for publication 21 September The techniques of Cited by: An analysis of formic acid decomposition on metal surfaces by the bond-order-conservation-Morse-potential approach.

Surface Science(), DOI: /(89) Evgeny Shustorovich. Energetics of metal-surface reactions: back-of-the-envelope theoretical by: The oxidation and decomposition reactions are anal-ogous, since the only role of oxygen is to prevent the reduction of the metal oxide surface.

The partial ox-idation of alcohols on TiO2, CuO and Co3O4 follows a Mars–van Krevelen mechanism, i.e. zero-order File Size: KB. Several theoretical studies have been reported on the chemisorption and decomposition of CH 3 OH involving several metal surfaces such as Ge(), 12 Ni(), 20 Cu(), 21,22 Cu(), 22−24 Cu.

The adsorption and decomposition of methanol on clean Ru() were investigated by and oxidation of methanol on clean metal surfaces. book infrared spectroscopy (RAIRS). At low temperature (90 K) and coverage ( L), it was confirmed that methanol adsorbs dissociatively as methoxide (CH3O−).

No experimental evidence was obtained of an alternative decomposition for high coverage. Periodic, self-consistent, Density Functional Theory (PWGGA) calculations are used to study competitive paths for the decomposition of methanol on Pt().

Pathways proceeding through initial C−H and C−O bond scission events in methanol are considered, and the results are compared to data for a pathway proceeding through an initial O−H scission event [Greeley et al.

Chem. Soc. The methanol permeation from the anode to cathode will be oxidized and cause mixed potential at the cathode, which consequently induces severe noble metal poisoning because of the strong adsorption of the CO-like species (by-products of methanol oxidation) on the noble metal surface (17, 18).

This phenomenon critically reduces the cathodic ORR. Chemisorption of Ammonia and other Group V/VI Hydrides. Ammonia has lone pairs available for bonding on the central nitrogen atom and may bond without dissociation to a single metal atom of a surface, acting as a Lewis base, to give a pseudo-tetrahedral co-ordination for the nitrogen atom.

Fig. 2 presents the voltammetric curves for the methanol electro-oxidation on Pt pc and on Pt pc /Rh x /Pt y (Fig. 2a) and Pt pc /Ru x /Pt y (x = 2 or 5 monolayers and y = 1 or 2 monolayers) (Fig. 2b). The methanol electro-oxidation profile for all electrodes are similar, characterized by two peaks during the positive-going scan and one peak in the negative-going scan, which evidences similar.

A periodic, self-consistent, Density Functional Theory study of methanol decomposition on Pt() is presented. The thermochemistry and activation energy barriers for all the elementary steps, starting with O−H scission and proceeding via sequential hydrogen abstraction from the resulting methoxy intermediate, are presented here.

The minimum energy path is represented by a one. The methanol decomposition to adsorbed meth-oxy and desorbed water is energetically favorable. This is due to the fact that the methoxy radical is strongly stabilized on transition metal surfaces. The energy stabilization on the Cu() surface is higher than the energy required for desorption of one water molecule from the catalyst.

The same is. An inverse relationship (for metal oxide catalysts displaying high (>85%) selectivity to either redox or acidic products) was found between the methanol oxidation TOF values and the decomposition. The partial oxidation of methanol to formaldehyde on clean and oxygen precovered Cu() and Cu() has been studied by density functional theory calculations within the generalized gradient approximation.

We have studied the geometric and electronic structure of the reaction intermediates. Methanol is only very weakly bound to copper.

Methanol electrooxidation rates on Pt surfaces are generally much smaller at electrode potentials between – V / RHE compared to those of formic acid. This can be accounted for by the absence of adsorbed water on Pt which is a requirement for CO 2 formation. Methanol oxidation exhibits a surface structure sensitivity with the.

Dissociative chemisorption of methanol on metal surfaces is a key step for hydrogen production. Mechanistic study of methanol decomposition and oxidation on Pt().

formate on clean. Formic acid adsorption and decomposition on clean Cu() and two atomic oxygen pre-covered Cu() surfaces have been studied using surface science techniques including scanning tunneling microscopy, low-energy electron diffraction, x-ray photoelectron spectroscopy, and infrared reflection–absorption spectroscopy.

The decomposition of methanol on clean and oxygen-precovered CuCl(1 1 1) surface have been studied with the method of density functional theory-generalized gradient. Methanol decomposition on clean (a) and oxygen covered surface of Cu() according to [23] Stationary polarization curves of polycrystalline zinc in CH3OH -LiClO4-LiCl solutions[12] Transient.

The interaction of methanol with clean and oxidized films of Ni, Pd and Al has been investigated in the temperature range – K. Dissociative adsorption of methanol on the clean films occurred even at K.

A substantial fraction of the adsorption on oxidized Al .Our knowledge about the oxidation steps of methanol on Cu surfaces is mainly based on temperature pro-grammed desorption (TPD) and scanning tunneling mi-croscopy (STM) experiments. Clean copper surfaces are relatively inactive for methanol oxidation.

At low surface temperatures of about K only adsorbed methanol is present at Cu surfaces [1.performance of the catalyst. We have investigated the instability of the surface composition to oxidation of the Ga 3Ni 2 noble metal-free intermetallic compound, a new catalyst for the CO 2 reduction to CO, CH 4 and methanol.

Methods: The instability of the oxidized Ga 3Ni 2 surface composition to different heating–annealing conditions was.