Evolution of the Active Phase of CoMo/Al2O3 Catalysts under Industrial Conditions: a High-Pressure MES Study

The behavior of CoMo/Al2O3 catalysts sulfided in H2S/H2 gas mixture, under industrial conditions, was investigated using Mossbauer emission spectroscopy (MES). An intermediate Co-Mo phase is formed after increasing the sulfidation pressure to 4 MPa, favoring the Co-Mo-S phase formation. An increase...

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Bibliographic Details
Main Authors: Dugulan, A I, Overweg, A R, Craje, M W J, Kearley, G J
Format: Conference Proceeding
Language:English
Subjects:
ALUMINIUM OXIDES
CATALYSIS
CATALYSTS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
COBALT COMPOUNDS
EMISSION SPECTROSCOPY
HYDROGEN
HYDROGEN SULFIDES
MIXTURES
MOESSBAUER EFFECT
MOLYBDENUM COMPOUNDS
PRESSURE RANGE MEGA PA 01-10
QUADRUPOLES
SULFIDATION
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Summary:The behavior of CoMo/Al2O3 catalysts sulfided in H2S/H2 gas mixture, under industrial conditions, was investigated using Mossbauer emission spectroscopy (MES). An intermediate Co-Mo phase is formed after increasing the sulfidation pressure to 4 MPa, favoring the Co-Mo-S phase formation. An increase in the quadrupole splitting value of the Co-sulfide species after treatment at 573 K is proposed as a prerequisite for the formation of ideal Co-Mo-S structures.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.1923630