Determination of the near-surface elemental composition of catalysts by the technique of proton-induced x-ray analysis. [Highly sensitive; limit of 10/sup -12/g absolute and 10/sup -6/ relative concentration]
- IBM Research, Yorktown Heights, NY
The technique of using an accelerated beam of protons to generate characteristic x rays from elements is shown to be particularly useful for analyzing catalysts. The information comes from within the first few micrometers of the surface, so all elements in this region, i.e., the catalytic elements as well as trace impurities in the support, are detected. The technique is highly sensitive for all the main catalytic elements (down to at least 10/sup -12/ g absolute and 10/sup -6/ relative concentration) and is rapid, taking typically only a few minutes to obtain a sample spectrum. Unlike x-ray production by electron beam irradiation, advantage can be taken of the fact that the information may be rendered quantitative simply by preparing the sample in the form of small (less than 2 ..mu..m) particulates: 3 MeV protons lose typically less than 2 percent of their energy in traversing such a particle. No chemical information is obtained, but the technique, by virtue of its special features, is well suited for use in conjunction with other near-surface analytical techniques.
- OSTI ID:
- 7321679
- Journal Information:
- J. Catal.; (United States), Vol. 45:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CATALYSTS
QUANTITATIVE CHEMICAL ANALYSIS
X-RAY SPECTRA
SURFACE COATING
ELEMENTS
PROTON BEAMS
SENSITIVITY
SURFACTANTS
TRACE AMOUNTS
X RADIATION
BEAMS
CHEMICAL ANALYSIS
DEPOSITION
ELECTROMAGNETIC RADIATION
IONIZING RADIATIONS
NUCLEON BEAMS
PARTICLE BEAMS
RADIATIONS
SPECTRA
400103* - Radiometric & Radiochemical Procedures- (-1987)