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γ‐Al 2 O 3 ‐Supported and Unsupported (Ni)MoS 2 for the Hydrodenitrogenation of Quinoline in the Presence of Dibenzothiophene
Author(s) -
Hein Jennifer,
Hrabar Ana,
Jentys Andreas,
Gutiérrez Oliver Y.,
Lercher Johannes A.
Publication year - 2014
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201300856
Subject(s) - dibenzothiophene , hydrodenitrogenation , hydrodesulfurization , quinoline , catalysis , molybdate , sulfidation , chemistry , sulfide , inorganic chemistry , nickel , flue gas desulfurization , organic chemistry
Supported MoS 2 /γ‐Al 2 O 3 and Ni‐MoS 2 /γ‐Al 2 O 3 as well as unsupported Ni‐MoS 2 were investigated in the hydrodenitrogenation (HDN) of quinoline in the presence of dibenzothiophene (DBT). The supported oxide catalyst precursors had a well‐dispersed amorphous polymolybdate structure that led to the formation of a highly dispersed sulfide phase. In contrast, the unsupported catalyst precursor consisted of a mixture of nickel molybdate and ammonium nickel molybdate phases that formed stacked sulfide slabs after sulfidation. On all catalysts, the reaction pathway for the removal of N in quinoline HDN mainly followed the sequence quinoline→1,2,3,4‐tetrahydroquinoline→decahydroquinoline→propylcyclohexylamine→propylcyclohexene→propylcyclohexane. The hydrodesulfurization of DBT proceeded mainly by direct desulfurization towards biphenyl. For both processes, the activity increased in the order MoS 2 /γ‐Al 2 O 3