Premium
Rhenium Effect on the Performance of CoMoNi/γ‐Al 2 O 3 Catalyst in Thiophene Hydrodesulphurization. Performance Evaluation and Process Kinetics
Author(s) -
Doukeh Rami,
Leostean Cristian,
Bolocan Ion,
Trifoi Ancuta Roxana,
Banu Ionut
Publication year - 2021
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202004326
Subject(s) - thiophene , catalysis , rhenium , hydrodesulfurization , x ray photoelectron spectroscopy , desorption , adsorption , space velocity , chemistry , inorganic chemistry , materials science , chemical engineering , organic chemistry , selectivity , engineering
The rhenium effect on the performance of CoMoNi/γ‐Al 2 O 3 catalyst was studied in thiophene hydrodesulphurization. The unsulfided and freshly sulfided catalysts were characterized by N 2 adsorption‐desorption, IR spectroscopy, X‐ray photoelectron spectroscopy (XPS) and total acidity. The effects of reaction temperature, pressure, and liquid hourly space velocity (LHSV) on thiophene HDS performance shown that the activity of the CoMoNiRe/γ‐Al 2 O 3 catalyst for thiophene HDS was superior to that of the CoMoNi/γ‐Al 2 O catalyst, which was mainly ascribed to the higher acidic functional groups. Based on Langmuir‐Hinshelwood approach, a kinetic model for thiophene HDS over both catalysts have been developed. In this respect, two mechanisms have been considered, one hypothesizing that hydrogen is adsorbed on different active centers than thiophene (two‐centers mechanism) and the other considering one type of active centers. Based on statistical reasons, the kinetic model considering two types of active centers proved to be more adequate in representing the experimental results.