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Active phase transformation in industrial CoMo/Al2O3 hydrotreating catalyst during its deactivation and rejuvenation with organic chemicals treatment
- Source :
- Fuel Processing Technology. 173:56-65
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- Reactivation of industrial CoMo/Al2O3 hydrotreating (HDT) catalysts was studied. A spent catalyst was used in the ULSD production for about 2.5 years. It was oxidatively regenerated and rejuvenated by organic acids (citric and thioglycolic), glycols (ethylene and triethylene), and dimethylsulfoxide solutions. All solids were characterized by the elemental analysis, N2 physisorption, X-ray powder diffraction, thermogravimetric analysis, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy. Changes in the active phase composition and morphology during the CoMo/Al2O3 HDT catalyst operation, regeneration and rejuvenation were shown. The rejuvenated catalysts were tested in hydrodesulfurization (HDS) of dibenzothiophene and hydrogenation (HYD) of naphthalene. It was found that oxidative regeneration allowed restoring about 70–85% rel. of initial activity. Rejuvenation with organic chemicals resulted in the complete restoration of HDS and HYD activities. Resulting catalytic activity of the reactivated catalysts depended on the properties of the formed active phase species. These correlations are discussed in the study.
- Subjects :
- Thermogravimetric analysis
Ethylene
Chemistry
General Chemical Engineering
Energy Engineering and Power Technology
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
Catalysis
chemistry.chemical_compound
Fuel Technology
X-ray photoelectron spectroscopy
Physisorption
Dibenzothiophene
0210 nano-technology
Hydrodesulfurization
Nuclear chemistry
Naphthalene
Subjects
Details
- ISSN :
- 03783820
- Volume :
- 173
- Database :
- OpenAIRE
- Journal :
- Fuel Processing Technology
- Accession number :
- edsair.doi...........58640b1dba8d9529ecbeb2a0f64734c2
- Full Text :
- https://doi.org/10.1016/j.fuproc.2018.01.008