SURFACE AND MICROANALYTICAL STUDIES OF WHETLERITE CHARCOALS: 1. EFFECTS OF AGING

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Authors
  1. McIntyre, N.S.
  2. Mount, G.R.
  3. Lipson, T.C.
  4. Humphrey, R.
  5. Harrison, B.
  6. and others
Corporate Authors
University of Western Ontario, London ONT (CAN) Natural Sciences Centre;Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
Whetlerite charcoals impregnated with copper and chromium have been studied by several surface and microanalytical techniques to determine the effects of aging on the composition and microstructure. X-ray photoelectron spectroscopic (XPS) studies of absorbers not deliberately aged, showed that most of copper on the inside of each particle was present as (Cu(I). Transmission microscopy showed that some of this copper is present as crystallites with diameters up to 0.1 mu m. Natural or artificial aging in a humid atmosphere resulted in the number and size of such crystallites and a migration of some of the copper impregnants to the outer surface of the particle, where it is bonded largely as Cu(OH). Chromium is present in the adsorber in both Cr(III) and Cr(VI) oxidation states and it undergoes little change during aging.
Keywords
X-ray photoelectron spectroscopy
Date of publication
11 Jun 1990
Number of Pages
10
Reprinted from
Carbon, vol 29, no 8, 1991, p 1071-1079
DSTKIM No
96-02599
CANDIS No
394283
Format(s):
Document Image stored on Optical Disk;Hardcopy

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