Ion scattering and electron spectroscopic study of catalysts prepared by adsorption of molybdate on alumina

Journal Article · Mon Oct 15 04:00:00 EDT 1990 · Analytical Chemistry (Washington); (USA)

DOI:https://doi.org/10.1021/ac00219a015· OSTI ID:6126705

Mulcahy, F M ^[1]; Houalla, M; Hercules, D M ^[2]

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1. Univ. of Pittsburgh, Bradford, PA (USA)
2. Univ. of Pittsburgh, PA (USA)

A series of Mo/Al{sub 2}O{sub 3} catalysts was prepared by using an equilibrium adsorption method. The dispersion of the molybdenum phase and coverage of the alumina surface by Mo species as a function of Mo loading were monitored by ion scattering spectroscopy (ISS) and X-ray photoelectron spectroscopy (XPS, ESCA). By modeling changes in the ISS Mo/Al intensity ratio as a function of molybdenum coverage, it is shown that, for Mo/Al{sub 2}O{sub 3} catalysts prepared by equilibrium adsorption, coverage of the alumina surface should be complete at a loading of 47 {times} 10{sup 13} Mo atoms/cm{sup 2} for calcined catalysts and 55 {times} 10{sup 13} Mo atoms/cm{sup 2} for dried catalysts. These values agree with those obtained from modeling of the ISS Al/O intensity ratio as a function of Mo loading.

• OSTI ID: 6126705
• Journal Information: Analytical Chemistry (Washington); (USA), Journal Name: Analytical Chemistry (Washington); (USA) Vol. 62:20; ISSN 0003-2700; ISSN ANCHA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYSTS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL PREPARATION
DATA
DEPOSITION
ELECTRON SPECTROSCOPY
EXPERIMENTAL DATA
INFORMATION
ION SCATTERING ANALYSIS
MEASURING METHODS
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
NONDESTRUCTIVE ANALYSIS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
REFRACTORY METAL COMPOUNDS
SPECTROSCOPY
SURFACE COATING
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS