Enhanced durability and reactivity for zinc ferrite desulfurization sorbent
AMAX Research Development Center (AMAX R D) investigated methods for enhancing the reactivity and durability of zinc ferrite desulfurization sorbents. Zinc ferrite sorbents are intended for use in desulfurization of hot coal gas in integrated gasification combined cycle (IGCC) or molten carbonate fuel cell (MCFC) applications. For this program, the reactivity of the sorbent may be defined as its sulfur sorption capacity at the breakthrough point and at saturation in a bench-scale, fixed-bed reactor. Durability may be defined as the ability of the sorbent to maintain important physical characteristics such as size, strength, and specific surface area during 10 cycles of sulfidation and oxidation. Two base case sorbents, a spherical pellet and a cylindrical extrude used in related METC-sponsored projects, were used to provide a basis for the aimed enhancement in durability and reactivity. Sorbent performance was judged on the basis of physical properties, single particle kinetic studies based on thermogravimetric (TGA) techniques, and multicycle bench-scale testing of sorbents. A sorbent grading system was utilized to quantify the characteristics of the new sorbents prepared during the program. Significant enhancements in both reactivity and durability were achieved for the spherical pellet shape over the base case formulation. Overall improvements to reactivity and durability were also made to the cylindrical extrude shape. The primary variables which were investigated during the program included iron oxide type, zinc oxide:iron oxide ratio, inorganic binder concentration, organic binder concentration, and induration conditions. The effects of some variables were small or inconclusive. Based on TGA studies and bench-scale tests, induration conditions were found to be very significant.
- Research Organization:
- AMAX Research and Development Center, Golden, CO (USA)
- Sponsoring Organization:
- DOE/FE
- DOE Contract Number:
- AC21-86MC23172
- OSTI ID:
- 5088398
- Report Number(s):
- DOE/MC/23172-2764-Vol.1; ON: DE90000422
- Country of Publication:
- United States
- Language:
- English
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Enhanced durability and reactivity for zinc ferrite desulfurization sorbent. Quarterly technical progress report 4, July--September 1987
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Related Subjects
FERRITES
SORPTIVE PROPERTIES
ZINC COMPOUNDS
BENCH-SCALE EXPERIMENTS
CHEMICAL ANALYSIS
COMBINED CYCLES
DESULFURIZATION
HOT GAS CLEANUP
HYDROGEN SULFIDES
IRON OXIDES
MOLTEN CARBONATE FUEL CELLS
PHYSICAL PROPERTIES
POROSITY
PROGRESS REPORT
SULFIDATION
SURFACE AREA
CHALCOGENIDES
CHEMICAL REACTIONS
DIRECT ENERGY CONVERTERS
DOCUMENT TYPES
ELECTROCHEMICAL CELLS
FERRIMAGNETIC MATERIALS
FUEL CELLS
HIGH-TEMPERATURE FUEL CELLS
HYDROGEN COMPOUNDS
IRON COMPOUNDS
MAGNETIC MATERIALS
MATERIALS
OXIDES
OXYGEN COMPOUNDS
PURIFICATION
SULFIDES
SULFUR COMPOUNDS
SURFACE PROPERTIES
THERMODYNAMIC CYCLES
TRANSITION ELEMENT COMPOUNDS
010402* - Coal
Lignite
& Peat- Purification & Upgrading