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Stability of a Cs‐promoted Co‐Mo/Al 2 O 3 catalyst during synthesis gas conversion
Author(s) -
Ardakani Shahrzad Jooya,
Alyani Mina,
Smith Kevin J.
Publication year - 2016
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.22381
Subject(s) - catalysis , selectivity , space velocity , chemistry , alcohol , incipient wetness impregnation , nuclear chemistry , inorganic chemistry , organic chemistry
The stability of a Cs‐promoted Co‐Mo/Al 2 O 3 catalyst, prepared by incipient wetness impregnation and operated under typical higher alcohol synthesis conditions, (280 °C, 8.2 MPa, GHSV 8524 h −1 , H 2 :CO ratio 1) for up to 100 h time‐on‐stream (TOS), is reported. The major cause of catalyst deactivation is shown to be due to carbonaceous deposits. The effect of adding H 2 O (0.047 and 0.094 mol/mol (4.7 and 9.4 mol %)), NH 3 (375–150 0× 10 −6 mol/mol (375–1500 ppmv)) and H 2 S (5 × 10 −6 and 10×10 −6 mol/mol (5 and 10 ppmv)) to the feed synthesis gas is also reported. Both the catalyst activity and the alcohol product selectivity are reduced in the presence of feed gas impurities, with H 2 O addition significantly increasing selectivity to CO 2 and coke deposition. The impact of NH 3 is reversible, whereas catalyst deactivation is only partially reversible in the case of H 2 O. H 2 S completely and irreversibly deactivates the catalyst.