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Studies of molybdena‐alumina catalysts. X. temperature programmed desorption of H 2 S and thiophene
Author(s) -
Ramachandran R.,
Massothm F. E.
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.5450600104
Subject(s) - thiophene , catalysis , desorption , hydrodesulfurization , chemistry , thermal desorption spectroscopy , pyridine , adsorption , inorganic chemistry , residue (chemistry) , product distribution , temperature programmed reduction , butene , organic chemistry , ethylene
Temperature programmed desorption (TPD) and reduction (TPR) studies were carried out on H 2 S and thiophene adsorbed on Mo/Al 2 O 3 and CoMo/Al 2 O 3 catalysts. Freshly sulfided and pyridine poisoned catalysts were run. For sulfided catalysts, the major products of desorption of thiophene were thiophene and butene, leaving a carbonaceous residue. Subsequent TPR in H 2 effected complete removal of the residue with formation of H 2 S, thiophene and butene. The residue appeared to consist of an easily reactive thiophene polymer and a less‐reactive, sulfur‐containing coke. Runs on poisoned catalysts showed less adsorption but product profiles were similar, showing that the adsorption characteristics of the remaining sites were not significantly altered.