Effect of alkali earth metal doping on the CuO/Al2O3 oxygen carrier agglomeration resistance during chemical looping combustion.
In: Journal of Cleaner Production, Jg. 366 (2022-09-15), S. N.PAG
academicJournal
Zugriff:
The influence of alkali earth metals (AEMs, including Ca, Sr and Ba) doping on the performance of CuO/Al 2 O 3 oxygen carrier (OC) in chemical looping combustion (CLC) was investigated. The OCs using solid-state synthesis method were evaluated in a fluidized bed reactor using municipal solid waste (MSW) syngas as fuel for 50 redox cycles. It was found that the doping of AEMs enhanced the CLC performance on CuO/Al 2 O 3. XRD characterization and TGA analysis showed that aluminates of AEMs were formed in the doped OCs leading to the segregation of CuO from CuAl 2 O 4 spinel, thereby promoting the redox kinetics. The OCs doped with AEMs exhibited enhanced stability and agglomeration resistance throughout multiple redox cycles in the fluidized bed experiments. CuO/Al 2 O 3 containing 40 wt% CuO suffered from severe agglomeration and deactivation during initial 5 cycles, while the OCs with Ba, Sr and Ca doping respectively deferred the agglomeration to 15-20th, 20-25th and >50th cycle. 5–10 wt% Ca-doping content exhibited great stability without deactivation or agglomeration issues during 50 cycles, but excess Ca doping (≥20 wt%) showed severe agglomeration. The agglomeration was attributed to the outward migration of Cu/CuO, leading to the segregation from CuAl 2 O 4 and surface enrichment. The enhanced agglomeration resistance with AEM doping was mainly attributed to outward migration of AEM species and inward migration of Cu species during the synthesis process. [Display omitted] • AEMs doping improved the redox activity of CuO/Al 2 O 3 oxygen carrier. • AEMs alleviated the agglomeration of CuO/Al 2 O 3 during redox cycles. • Ca had better anti-agglomeration effect than Ba and Sr. • Anti-agglomeration was due to Cu inward and AEM outward migration in synthesis. [ABSTRACT FROM AUTHOR]
Titel: |
Effect of alkali earth metal doping on the CuO/Al2O3 oxygen carrier agglomeration resistance during chemical looping combustion.
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Autor/in / Beteiligte Person: | Liu, Guicai ; Chang, Chia Chyi ; Zhao, Ya ; Veksha, Andrei ; Giannis, Apostolos ; Lim, Teik Thye ; Lisak, Grzegorz |
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Zeitschrift: | Journal of Cleaner Production, Jg. 366 (2022-09-15), S. N.PAG |
Veröffentlichung: | 2022 |
Medientyp: | academicJournal |
ISSN: | 0959-6526 (print) |
DOI: | 10.1016/j.jclepro.2022.132970 |
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