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X-Ray absorption spectroscopy under conditions of total external reflection: application to the structural characterisation of the Cu/GaAs(100) interface

General discussion ( Faraday Discussions of the Chemical Society Vol -89 )

Sulphur-induced structural chemistry of oxide surfaces

In situ studies of supported rhodium catalysts

Characterisation of oxide-supported alkene conversion catalysts using X-ray absorption spectroscopy

Structural studies of high-area zeolitic adsorbents and catalysts by a combination of high-resolution X-ray powder diffraction and X-ray absorption spectroscopy

EXAFS study of the influence of hydrogen desorption and oxygen adsorption on the structural properties of small iridium particles supported on Al₂O₃

General discussion ( Faraday Discussions of the Chemical Society Vol -89 )

Structure and roughening of the Pt(110) surface

Structure of the Ge(111)-c(2 × 8) surface as determined from scattered X-ray intensities along crystal truncation rods

X-Ray scattering from surfaces and interfaces

X-Ray scattering from semiconductor interfaces

General discussion ( Faraday Discussions of the Chemical Society Vol -89 )

Langmuir monolayers: structures and phase transitions

Structure of surfaces and interfaces as studied using synchrotron radiation. Liquid surfaces

General discussion ( Faraday Discussions of the Chemical Society Vol -89 )

Core-level shift spectroscopy on tungsten surfaces. Overlayer and underlayer adsorption

Characterization of metal/organic molecule and metal/polymer interfaces by NEXAFS spectroscopy

Structure of the surface methoxy species on Cu{111}

Normal-incidence standing X-ray wavefield absorption and SEXAFS studies of adsorption structures on Cu and Ni surfaces

Photoelectron diffraction study of O, N and C adsorption structures on Ni(100) and Cu(110)

Study of xenon layers on a Cu(111) surface

General discussion ( Faraday Discussions of the Chemical Society Vol -89 )

Index of names

Faraday Discussions of the Chemical Society Vol -79

Faraday Discussions of the Chemical Society Vol -69

Faraday Discussions of the Chemical Society Vol -59

In situ studies of supported rhodium catalysts

Content Provider	Royal Society of Chemistry (RSC)
Author	Johnston, Peter Pudney, Paul D. A. Joyner, Richard W. Shpiro, Efim S. Williams, B. Peter
Copyright Year	1990
Abstract	Rhodium catalysts have been prepared, supported on γ-alumina, vanadium(III) oxide, chromia and molybdena. The activity and selectivity of these materials in the conversion of synthesis gas, (H2/CO: 1/1, 523 K and 5 bar pressure), to methanol, ethanol and hydrocarbons has been studied. All catalysts showed similar activity except for chromia, which was almost inactive at the temperature chosen. Selectivity to higher oxygenates followed the trend: V2O3 > MoO3 > Al2O3 > Cr2O3. The alumina supported catalysts had the highest selectivity to methanol. Catalysts have been characterised in situ by extended X-ray absorption fine structure (EXAFS) and the alumina-supported material has been examined in the greatest detail. On reduction at 473 K, rhodium particles with diameter < 1 nm are observed by electron microscopy, and EXAFS indicates that these contain ca. 10 rhodium atoms on average. There is good evidence that these particles may be bonded to oxygen of the support or residual chlorine from the impregnation procedure. X-ray photoelectron spectroscopy shows that the surface stoichiometry is ca. Cl/Rh: 1.3/1.On exposure to carbon monoxide at room temperature the metal particles break up completely and form entities with the composition (CO)2·Rh·Cl2 and bond lengths similar to those in crystalline Rh2Cl2(CO)4. On exposure to synthesis gas at 323 K metallic particles are partly reformed.Under conditions of catalytic relevance only metallic particles are observed although some Rh—Cl bonding persists on alumina. No rhodium–chlorine bonding is observed on vanadia-supported catalysts, although the metal particles have a similar average size to those found on alumina. There is some evidence that the particle size is much less uniform on vanadia than on alumina. Exposure to synthesis gas causes small changes in particle parameters, which may be related to the chemisorption of carbon monoxide. The average particle size is much larger, > 30 Å diameter, on the chromia support.The relation between catalyst structure and performance is discussed.
Starting Page	91
Ending Page	105
Page Count	15
File Format	PDF
ISSN	03017249
Volume Number	89
Journal	Faraday Discussions of the Chemical Society
DOI	10.1039/DC9908900091
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Rhodium Vanadium(III) oxide Chromia Syngas Methanol Ethanol Aluminium oxide Extended X-ray absorption fine structure Transmission electron microscopy Oxygen Chlorine X-ray photoelectron spectroscopy Photoemission spectroscopy Stoichiometry Carbon monoxide Chemical bond Chemisorption
Content Type	Text
Resource Type	Article

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Faraday communications. Influence of chlorine on the lability of small rhodium particles in carbon monoxide

Activated-carbon-supported K–Co–Mo catalysts for synthesis of higher alcohols from syngas

Characterisation of oxide-supported alkene conversion catalysts using X-ray absorption spectroscopy

New and revisited insights into the promotion of methanol synthesis catalysts by CO₂

Structure of the methanol synthesis catalyst determined by in situ HERFD XAS and EXAFS

In situ X-ray absorption spectroscopy of transition metal based water oxidation catalysts

Structure of germanium oxide on CVD zeolites by extended X-ray absorption fine structure and X-ray photoelectron spectroscopy

Preparation and characterization of vanadium oxide promoted rhodium catalysts (1986).

Surface and bulk properties, catalytic activities and selectivities in methane oxidation on near-stoichiometric calcium hydroxyapatites

In situ studies of supported rhodium catalysts

Similar Documents

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