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Title: Chemical-looping combustion of coal-derived synthesis gas over copper oxide oxygen carriers

Abstract

CuO/bentonite and CuO-BHA nanocomposites were studied as oxygen carriers in chemical-looping combustion (CLC) of simulated synthesis gas. Global reaction rates of reduction and oxidation, as the function of reaction conversion, were calculated from 10-cycle oxidation/reduction tests utilizing thermogravimetric analysis at atmospheric pressure between 700 and 900{degree}C. It was found that the reduction reactions are always faster than oxidation reactions; reaction temperature and particle size do not significantly affect the reaction performance of CuO/bentonite. Multicycle CLC tests conducted in a high-pressure flow reactor showed stable reactivity for production of CO{sub 2} from fuel gas at 800 and 900{degree}C and full consumption of hydrogen during the reaction. Results of the tapered element oscillating microbalance showed a negative effect of pressure on the global rates of reduction-oxidation reactions at higher fractional conversions. X-ray diffraction patterns confirmed the presence of CuO in the bulk phase of the oxidized sample. Electron microanalysis showed significant morphology changes of reacted CuO/bentonite samples after the 10 oxidation-reduction cycles above 700{degree}C in an atmospheric thermogravimetric analyzer. The nanostructured CuO-BHA carrier also showed excellent stability and, in comparison to the CuO/bentonite system, slightly accelerated redox kinetics albeit at the expense of significantly increased complexity of manufacturing. Overall, both types ofmore » CuO carriers exhibited excellent reaction performance and thermal stability for the CLC process at 700-900{degree}C. 48 refs., 12 figs., 8 tabs.« less

Authors:
; ; ; ; ; ; ;  [1]
  1. U.S. Department of Energy, Morgantown, WV (United States). National Energy Technology Laboratory
Publication Date:
OSTI Identifier:
21125976
Resource Type:
Journal Article
Journal Name:
Energy and Fuels
Additional Journal Information:
Journal Volume: 22; Journal Issue: 6; Other Information: ranjani.siriwardane@netl.doe.gov; Journal ID: ISSN 0887-0624
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; COAL GAS; SYNTHESIS GAS; COMBUSTION; REDOX REACTIONS; OXIDATION; REDUCTION; COPPER OXIDES; CHEMICAL REACTION KINETICS; THERMAL GRAVIMETRIC ANALYSIS; REACTIVITY; X-RAY DIFFRACTION; MORPHOLOGY

Citation Formats

Tian, Hanjing, Chaudhari, Karuna, Simonyi, Thomas, Poston, James, Liu, Tengfei, Sanders, Tom, Veser, Goetz, and Siriwardane, Ranjani. Chemical-looping combustion of coal-derived synthesis gas over copper oxide oxygen carriers. United States: N. p., 2008. Web. doi:10.1021/ef800438x.
Tian, Hanjing, Chaudhari, Karuna, Simonyi, Thomas, Poston, James, Liu, Tengfei, Sanders, Tom, Veser, Goetz, & Siriwardane, Ranjani. Chemical-looping combustion of coal-derived synthesis gas over copper oxide oxygen carriers. United States. https://doi.org/10.1021/ef800438x
Tian, Hanjing, Chaudhari, Karuna, Simonyi, Thomas, Poston, James, Liu, Tengfei, Sanders, Tom, Veser, Goetz, and Siriwardane, Ranjani. Sat . "Chemical-looping combustion of coal-derived synthesis gas over copper oxide oxygen carriers". United States. https://doi.org/10.1021/ef800438x.
@article{osti_21125976,
title = {Chemical-looping combustion of coal-derived synthesis gas over copper oxide oxygen carriers},
author = {Tian, Hanjing and Chaudhari, Karuna and Simonyi, Thomas and Poston, James and Liu, Tengfei and Sanders, Tom and Veser, Goetz and Siriwardane, Ranjani},
abstractNote = {CuO/bentonite and CuO-BHA nanocomposites were studied as oxygen carriers in chemical-looping combustion (CLC) of simulated synthesis gas. Global reaction rates of reduction and oxidation, as the function of reaction conversion, were calculated from 10-cycle oxidation/reduction tests utilizing thermogravimetric analysis at atmospheric pressure between 700 and 900{degree}C. It was found that the reduction reactions are always faster than oxidation reactions; reaction temperature and particle size do not significantly affect the reaction performance of CuO/bentonite. Multicycle CLC tests conducted in a high-pressure flow reactor showed stable reactivity for production of CO{sub 2} from fuel gas at 800 and 900{degree}C and full consumption of hydrogen during the reaction. Results of the tapered element oscillating microbalance showed a negative effect of pressure on the global rates of reduction-oxidation reactions at higher fractional conversions. X-ray diffraction patterns confirmed the presence of CuO in the bulk phase of the oxidized sample. Electron microanalysis showed significant morphology changes of reacted CuO/bentonite samples after the 10 oxidation-reduction cycles above 700{degree}C in an atmospheric thermogravimetric analyzer. The nanostructured CuO-BHA carrier also showed excellent stability and, in comparison to the CuO/bentonite system, slightly accelerated redox kinetics albeit at the expense of significantly increased complexity of manufacturing. Overall, both types of CuO carriers exhibited excellent reaction performance and thermal stability for the CLC process at 700-900{degree}C. 48 refs., 12 figs., 8 tabs.},
doi = {10.1021/ef800438x},
url = {https://www.osti.gov/biblio/21125976}, journal = {Energy and Fuels},
issn = {0887-0624},
number = 6,
volume = 22,
place = {United States},
year = {2008},
month = {11}
}