Comparative evaluation of rejuvenation of spent residue hydroprocessing catalysts in the decoked (oxide) and coked (sulfided) forms
Conference
·
OSTI ID:141284
- Petroleum Technology Dept., Safat (Kuwait)
Two routes were used to rejuvenate spent residue hydroprocessing catalyst by leaching foulant metals. In the first, the deoiled spent catalyst containing coke and deposited metals in the sulfide form was chemically treated to remove the metal foulants. In the second, the deoiled spent catalyst was decoked by controlled combustion of coke and the resultant coke free catalyst containing the metals in the oxide form was subjected to leaching. Oxalic acid, a chelating agent, that can form soluble metal complexes was used for metal leaching in both routes. The influence of adding an oxidizing agent such as H{sub 2}O{sub 2} to oxalic acid on the leaching efficiency was also examined in both routes. The spent and treated catalysts were characterized and the improvements in surface area pore volume and HDS activity of the catalysts as a result of leaching in different routes compared. The selectivity for leaching of the major metal foulant (vanadium) was better, and activity recovery was higher for the catalyst rejuvenated by metal leaching prior to decoking.
- OSTI ID:
- 141284
- Report Number(s):
- CONF-930304--
- Country of Publication:
- United States
- Language:
- English
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