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High-temperature sulfidation-regeneration of CO-Al_2O_3 sorbents

Patrick, V. and Gavalas, G. R. and Flytzani-Stephanopoulos, M. and Jothimurugesan, K. (1989) High-temperature sulfidation-regeneration of CO-Al_2O_3 sorbents. Industrial & Engineering Chemistry Research, 28 (7). pp. 931-940. ISSN 0888-5885. https://resolver.caltech.edu/CaltechAUTHORS:20151008-112329792

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Abstract

Thermogravimetric analysis (TGA) and flow-reactor experiments were used to study sulfidation-regeneration of highly porous CuO-Al_2O_3 sorbents. In TGA studies, sulfidation of reduced sorbents produced a high-temperature form of digenite (Cu_(9+x)S_5) as the major crystalline product. When a platinum pan was used in the TGA, significant sulfur chemisorption on alumina occurred. Sulfur chemisorption on alumina was eliminated by use of a quartz sample pan. Reaction of the mixed-oxide sorbents with a mixture of H_2S, H_2, H_2O, and N_2 in a packed-bed microreactor, at temperatures between 550 and 800 °C, yielded prebreakthrough outlet-H_2S levels considerably lower than those predicted by the sulfidation equilibrium of metallic copper. Independent reduction experiments confirmed that alumina stabilizes CuO against complete reduction to Cu. With this mechanism at work, low prebreakthrough H_2S levels are attributed to sulfidation reactions of copper at oxidation states of +1 or +2. The sulfided sorbents were completely regenerable in air/N_2 mixtures with no deterioration of subsequent sulfidation performance.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/ie00091a008DOIArticle
http://pubs.acs.org/doi/abs/10.1021/ie00091a008PublisherArticle
ORCID:
AuthorORCID
Gavalas, G. R.0000-0003-1468-6835
Alternate Title:High-temperature sulfidation-regeneration of copper(II) oxide-alumina sorbents
Additional Information:© 1989 American Chemical Society. Received for received June 29, 1988. Revised manuscript received February 24, 1989. Accepted March 26, 1989. This work was funded by the Department of Energy, Morgantown Energy Technology Center, Contract DE-FC21-85MC22193, and by the Synthetic Fuels Center of the MIT Energy Laboratory.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-FC21-85MC22193
MIT Energy LaboratoryUNSPECIFIED
Issue or Number:7
Record Number:CaltechAUTHORS:20151008-112329792
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20151008-112329792
Official Citation:High-temperature sulfidation-regeneration of copper(II) oxide-alumina sorbents V. Patrick, George R. Gavalas, M. Flytzani-Stephanopoulos, and K. Jothimurugesan Industrial & Engineering Chemistry Research 1989 28 (7), 931-940 DOI: 10.1021/ie00091a008
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:60896
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:19 Oct 2015 17:56
Last Modified:03 Oct 2019 09:02

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