Attrition-resistant zinc titanate sorbent for sulfur
- Southern Illinois Univ., Carbondale, IL (United States). Dept. of Mechanical Engineering and Energy Processes
- Research Triangle Inst., Research Triangle Park, NC (United States). Center for Process Research
For new coal gasification systems, zinc titanate sorbents are being developed to remove sulfur from the hot product gas prior to its use in combined cycle turbines and high-temperature fuel cells. The properties of zinc titanate for this application are very attractive. However, there is still a concern about durability over many sulfidation-regeneration cycles. The approach to the problem taken in this project was to contain the zinc titanate in a structural matrix of excess titania. Fifteen sorbent formulations were evaluated in a screening study to obtain a good compromise between mechanical properties and chemical reactivity. Then, the two best formulations were evaluated in ten-cycle fluidized bed and fixed bed tests. One of these was shown to be outstanding in resistance to attrition and decrepitation during the tests. It had the composition 33.5% zinc oxide and 66.5% titania, was prepared from 2 {micro}m powders, and was sintered at 1,000 C. The crush strength of this sorbent was approximately a factor of 10 higher than values reported by other investigators. Its chemical reactivity was good, and improvement should be possible with minor changes in preparation procedures. The results of complementary research on improving sorbent regeneration procedures and on activation pretreatments are reported, also.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 183097
- Journal Information:
- Industrial and Engineering Chemistry Research, Vol. 34, Issue 12; Other Information: PBD: Dec 1995
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
FUEL GAS
HOT GAS CLEANUP
DESULFURIZATION
ADSORBENTS
MATERIALS TESTING
ZINC COMPOUNDS
TITANATES
COAL GASIFICATION PLANTS
COMBINED-CYCLE POWER PLANTS
TITANIUM OXIDES
FRAGMENTATION
COMPRESSION STRENGTH
SORPTIVE PROPERTIES
HYDROGEN SULFIDES
SULFUR DIOXIDE
REMOVAL
MOLTEN CARBONATE FUEL CELLS