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Reduction, sulfidation, and regeneration of mixed iron-aluminum oxide sorbents

Patrick, Valerie and Gavalas, George R. and Sharma, Pramod K. (1993) Reduction, sulfidation, and regeneration of mixed iron-aluminum oxide sorbents. Industrial & Engineering Chemistry Research, 32 (3). pp. 519-532. ISSN 0888-5885.

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The reduction and sulfidation of Fe_2O_3 and Fe_2O_3-Al_2O_3 sorbents were investigated by thermogravimetric analysis (TGA). Mixed iron-aluminum oxides were reduced more slowly and by a more complex mechanism than pure iron oxide. Several phases that were responsible for this difference were identified by temperature-programmed reduction (TPR), X-ray diffraction (XRD), BET surface area (BET), and scanning electron microscopy (SEM). Sulfidation of reduced sorbents in the TGA at 600 "C produced two crystalline phases: high-temperature, hexagonal pyrrhotite (Fe_(1-x)S), and unreacted FeAl_2O_4. The reaction of the pure and mixed oxide with a mixture of H_2S-H_2-H_2O-N_2 was studied in a tubular microreactor to evaluate the performance of these materials as high-temperature H2S sorbents. At 650 °C the mixed oxide yielded considerably lower prebreakthrough outlet H_2S levels than the pure iron oxide. Regeneration in pure SO_2 and SO_2-air mixtures of sulfided samples resulted in complete conversion of iron sulfide to iron oxide and quantitative recovery of elemental sulfur.

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Gavalas, George R.0000-0003-1468-6835
Additional Information:© 1993 American Chemical Society. Received for review July 2, 1992. Revised manuscript received November 5, 1992. Accepted November 23,1992. This project was funded by a grant from General Electric Company.
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General ElectricUNSPECIFIED
Issue or Number:3
Record Number:CaltechAUTHORS:20151007-090429100
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Official Citation:Reduction, sulfidation, and regeneration of mixed iron-aluminum oxide sorbents Valerie Patrick, George R. Gavalas, and Pramod K. Sharma Industrial & Engineering Chemistry Research 1993 32 (3), 519-532 DOI: 10.1021/ie00015a015
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:60855
Deposited By: George Porter
Deposited On:07 Oct 2015 17:44
Last Modified:03 Oct 2019 09:01

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