Premium
Deactivation studies of nickel catalysts used in the methanation of carbon monoxide
Author(s) -
Bajpai P. K.,
Bakhshi N. N.,
Mathews J. F.
Publication year - 1982
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450600102
Subject(s) - methanation , catalysis , calcination , carbon monoxide , crystallite , nickel , carbon fibers , sintering , materials science , metal , inorganic chemistry , chemical engineering , chemistry , metallurgy , organic chemistry , composite number , composite material , engineering
Four laboratory prepared catalysts (Ni/Al 2 O 3 , NiNaY‐uncalcined, NiNaY‐calcined, NiCaY‐calcined) and a commercially available catalyst G‐87 were studied for their deactivation behavior over a period of 24 h at 573 k for various H 2 /CO ratios (3.1, 3.8, 6.4 and 24.5). The results indicated that the activities did not change much with time at H 2 /CO ratios of 3.8 and higher. Detailed measurement of catalytic activities, crystallite sizes, metal areas and carbon depositions were made at an H 2 /CO ratio of 3.1. These measurements indicated that sintering and carbon depositions occurred on all the catalysts thus deactivating the catalysts. An attempt has been made to explain the catalytic behavior in terms of crystallite size changes and carbon depositions. Limited regeneration studies of G‐87 and NiNaY‐calcinated catalysts have also been done.