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

doi:10.1016/j.jechem.2017.07.014

能源化学(英文) ›› 2017, Vol. 26 ›› Issue (5): 891-901.DOI: 10.1016/j.jechem.2017.07.014

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

Syed K Haider^a, María Erans^a, Felix Donat^c, Lunbo Duan^a,b, Stuart A Scott^c, Vasilije Manovic^a, Edward J Anthony^a

a Combustion and CCS Centre, Cranfield University, Bedfordshire MK43 0AL, UK;
b Key Laboratory of Energy Thermal Conversion and Control, Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China;
c Department of Engineering, University of Cambridge, Trumpington Street, Cambridge, UK

收稿日期:2017-05-08 修回日期:2017-07-20 出版日期:2017-09-15 发布日期:2017-11-10
通讯作者: Syed K Haider,E-mail address:haidersyedkumail@gmail.com

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

Syed K Haider^a, María Erans^a, Felix Donat^c, Lunbo Duan^a,b, Stuart A Scott^c, Vasilije Manovic^a, Edward J Anthony^a

a Combustion and CCS Centre, Cranfield University, Bedfordshire MK43 0AL, UK;
b Key Laboratory of Energy Thermal Conversion and Control, Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China;
c Department of Engineering, University of Cambridge, Trumpington Street, Cambridge, UK

Received:2017-05-08 Revised:2017-07-20 Online:2017-09-15 Published:2017-11-10
Contact: Syed K Haider,E-mail address:haidersyedkumail@gmail.com

摘要/Abstract

摘要： 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℃. 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.

关键词: Chemical-looping, Oxygen carrier, Copper, Carbon capture

Abstract: 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℃. 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.

Key words: Chemical-looping, Oxygen carrier, Copper, Carbon capture

Syed K Haider, María Erans, Felix Donat, Lunbo Duan, Stuart A Scott, Vasilije Manovic, Edward J Anthony. Copper-based oxygen carriers supported with alumina/lime for the chemical looping conversion of gaseous fuels[J]. 能源化学(英文), 2017, 26(5): 891-901.

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

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

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