CUED Publications database

Copper-based oxygen carriers supported with alumina/lime for the chemical looping conversion of gaseous fuels

Haider, SK and Erans, M and Donat, F and Duan, L and Scott, SA and Manovic, V and Anthony, EJ (2017) Copper-based oxygen carriers supported with alumina/lime for the chemical looping conversion of gaseous fuels. Journal of Energy Chemistry, 26. pp. 891-901. ISSN 2095-4956

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Copper (II) oxide in varying ratios was combined with either an alumina-based cement (Al300), or CaO derived from limestone as support material in a mechanical pelletiser. This production method was used to investigate its influence on possible mechanical and chemical improvements for oxygen carriers in chemical looping processes. These materials were tested in a lab-scale fluidised bed with CO or CH4 as a reducing gas at 950 °C. As expected, the oxygen carriers containing a greater ratio of support material exhibited an enhanced crushing strength. Oxygen carriers comprised of a 1:3 ratio of support material to active CuO exhibited increased crushing strength by a minimum of 280% compared to pure CuO pellets. All oxygen carriers exhibited a high CO conversion yield and were fully reducible from CuO to Cu. For the initial redox cycle, Al300-supported oxygen carriers showed the highest fuel and oxygen carrier conversion. The general trend observed was a decline in conversion with an increasing number of redox cycles. In the case of CaO-supported oxygen carriers, all but one of the oxygen carriers suffered agglomeration. The agglomeration was more severe in carriers with higher ratios of CuO. Oxygen carrier Cu25Al75 (75 wt% aluminate cement and 25 wt% CuO), which did not suffer from agglomeration, showed the highest attrition with a loss of approximately 8% of its initial mass over 25 redox cycles. The reducibility of the oxygen carriers was limited with CH4 in comparison to CO. CH4 conversion were 15%–25% and 50% for Cu25Ca75 (25 wt% CuO and 75 wt% CaO) and Cu25Al75, respectively. Cu25Ca75 demonstrated improved conversion, whereas Cu25Al75 exhibited a trending decrease in conversion with increasing redox cycles.

Item Type: Article
Divisions: Div A > Energy
Depositing User: Unnamed user with email
Date Deposited: 13 Oct 2017 20:26
Last Modified: 15 Apr 2021 02:29
DOI: 10.1016/j.jechem.2017.07.014