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Catalysis of the combustion of synthetic char particles by various forms of calcium additives

Levendis, Y. A. and Nam, S. W. and Lowenberg, M. and Flagan, R. C. and Gavalas, G. R. (1989) Catalysis of the combustion of synthetic char particles by various forms of calcium additives. Energy and Fuels, 3 (1). pp. 28-37. ISSN 1520-5029. https://resolver.caltech.edu/CaltechAUTHORS:20150805-110546824

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Abstract

The reactivity of calcium-laden carbonaceous particles to oxygen was investigated in the range 670-3000 K. The char particles were prepared from poly(furfural alcohol) (PFA) and were spherical and of uniform size. Three different methods were used to introduce the calcium additive: precipitation of calcium carbonate, impregnation with calcium acetate, and calcium ion exchange. Electron microscopy showed that the distribution of calcium was remarkably uniform in particles containing a bimodal distribution of micropores and transitional pores, whereas for particles with micropores only the Ca concentration was high at the surface and low at the center. X-ray analysis indicated that the conversion of the carbonate to the oxide at low temperatures (below 900 K) takes place only after all carbon has been consumed. Combustion studies showed that the calcium catalyzed the oxidation reaction at all temperatures investigated by up to 2 orders of magnitude. The effectiveness of the catalyst introduced by the different methods was comparable, with the calcium ion exchanged chars being, in general, the most reactive.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/ef00013a006DOIArticle
http://pubs.acs.org/doi/abs/10.1021/ef00013a006PublisherArticle
ORCID:
AuthorORCID
Flagan, R. C.0000-0001-5690-770X
Gavalas, G. R.0000-0003-1468-6835
Additional Information:© 1989 American Chemical Society. Received June 20, 1988. Revised Manuscript Received September 30, 1988. This research was supported by a subcontract of Physical Sciences, Inc., on U.S. Department of Energy University Contract No. DE-AC22-86PC90751. M.L. was supported by a Link Foundation fellowship.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-AC22-86PC90751
Link FoundationUNSPECIFIED
Issue or Number:1
Record Number:CaltechAUTHORS:20150805-110546824
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150805-110546824
Official Citation:Catalysis of the combustion of synthetic char particles by various forms of calcium additives Y. A. Levendis, S. W. Nam, M. Lowenberg, R. C. Flagan, and G. R. Gavalas Energy & Fuels 1989 3 (1), 28-37 DOI: 10.1021/ef00013a006
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59218
Collection:CaltechAUTHORS
Deposited By: Irina Meininger
Deposited On:18 Sep 2015 23:17
Last Modified:03 Oct 2019 08:44

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