Synthesis and characterization of akaganeite-like ferric oxyhydroxides

Conference · Fri Aug 01 04:00:00 EDT 1997

OSTI ID:501002

Linehan, J C; Darab, J G; Matson, D W; Chen, X; Amonette, J E ^[1]

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1. Pacific Northwest National Lab., Richland, WA (United States)

Iron-based powders have been used as catalytic and stoichiometric reactants in a variety of organic reactions and are receiving additional attention as ion exchange materials or once-through adsorbents for clean-up of toxic or radioactive waste streams. Recent efforts have been directed toward the design of iron-based products, in particular iron sulfides, capable of performing as hydrocracking catalysts for coal liquefaction and heavy crude or resid cracking. Here the authors present structural studies of new materials having akaganeite-like structures and of their use as hydrocracking catalyst precursors. Akaganeite, {beta}-FeOOH, a natural ferric oxyhydroxide mineral, has a structure containing tunnel-like cavities in which chloride ions reside. Analogs of akaganeite in which carbonate or sulfate groups replace the chloride ions have also been synthesized. Both akaganeite and its substituted analogs are known to be precursors for active hydrocracking catalysts. The authors present powder X-ray diffraction (XRD) and X-ray absorption fine-structure spectroscopy (XAFS) data confirming the synthesis of new ferric oxyhydroxides having structures similar to akaganeite, but contain molybdate and tungstate oxy-anions. They also present a new hydrothermal method to prepare this family of materials.

• Sponsoring Organization: USDOE, Washington, DC (United States)
• OSTI ID: 501002
• Report Number(s): CONF-960401--; ISBN 1-55899-335-5
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
02 PETROLEUM
36 MATERIALS SCIENCE
CATALYSTS
COAL LIQUEFACTION
CRYSTAL STRUCTURE
HYDROCRACKING
HYDROTHERMAL SYNTHESIS
IRON HYDROXIDES
PETROLEUM RESIDUES
PRECURSOR