Improved resistance to vanadium catalyzed steam deactivation by a demetallization for recycle of spent FCCU catalyst
- Coastal Catalyst Technology, Inc., Houston, TX (United States)
Demetallized spent FCCU catalysts for recycle processing incorporates leach and wash controls and procedures to improve the hydrothermal stability of the base catalyst. Microactivity (MAT) testing following steaming, and pilot plant testing, showed that removal of metal contaminants improved hydrothermal stability, e.g. resistance to deactivation by steam catalyzed by vanadium; aqueous processing further enhance catalytic properties. optimizing a system requires specification of the objectives e.g. maximizing conversion, olefins, isobutylene, liquid product yield, calculated total product values, throughput, etc., or minimizing coke, dry gas, unconverted bottoms, regenerator temperature, catalyst losses, solid waste, et al. Immediate activity improvement is seen in MATs prior to steaming. Improved resistance to steam deactivation is shown after spent (ecat) and demetallized spent catalyst (dcat) were steamed for 16 hours at 778{degrees}C, and then ASTM microactivity (MAT) tested. Examples of the benefit of demetallization and various aqueous processing alternatives are shown with surface areas and x-ray diffraction results. 11 refs., 3 tabs.
- OSTI ID:
- 416418
- Report Number(s):
- CONF-960730--
- Country of Publication:
- United States
- Language:
- English
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