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Sintering kinetics of silica- and alumina-supported nickel in hydrogen atmosphere

Journal Article · · J. Catal.; (United States)
Loss of nickel surface area occurs during sintering of nickel/silica (Ni/SiO/sub 2/) and nickel/alumina (Ni/Al/sub 2/O/sub 3/) in hydrogen (H/sub 2/) as a result of support collapse and growth of metal crystallites, particularly, in the Ni/Al/sub 2/O/sub 3/ system. Growth of metal crystallites is predominant at high temperatures. Ni/SiO/sub 2/ sinters more rapidly than Ni/Al/sub 2/O/sub 3/ at temperatures above 923K, but less rapidly in H/sub 2/ than in helium (He) atmosphere (data obtained in He from previous study). Orders of sintering decrease with increasing temperature and time of sintering. The kinetic and transmission electron microscopy data are consistent with a shift in mechanism from crystalline migration to atomic migration with increasing temperature and time of sintering. 10 figures, 5 tables.
Research Organization:
Brigham Young Univ., Provo, Utah
OSTI ID:
5944526
Journal Information:
J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 81:1; ISSN JCTLA
Country of Publication:
United States
Language:
English