Comparison of CuO and NiO as oxygen carrier in chemical looping combustion of a Victorian brown coal

Saha, Chiranjib; Bhattacharya, Sankar

doi:10.1016/j.ijhydene.2011.06.065

Cited by 45 publications

(33 citation statements)

References 18 publications

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“…Thus, CuO does not require heat to maintain the working temperature for reduction. However, Cu-based oxygen carriers suffer from the sintering problem as melting point of metallic Cu is relatively low, 1,083.4°C [97]. Hence, in order to use Cu-based oxygen carriers, one needs to reduce the reaction temperature.…”

Section: Chemical Looping Steam Methane Reforming (Cl-smr)mentioning

confidence: 99%

Clean Hydrogen Production Methods

Kumar

2015

SpringerBriefs in Energy

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Section: Chemical Looping Steam Methane Reforming (Cl-smr)mentioning

confidence: 99%

Clean Hydrogen Production Methods

Kumar

2015

SpringerBriefs in Energy

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“…The most preferable characteristics of a good oxygen carrier include high oxygen transport capacity, high mechanical strength, high reactivity, and low agglomeration due to reaction with coal particles and fly ash. Several oxides of different metals such as Ni, Cu, Fe, Mn, Co, Zn, and Cd have been studied in the CLC process . Oxygen carriers based on Cu, Fe, and Ni are the most studied candidates for CLC of solid fuels .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of ash‐free coal for chemical looping combustion ‐ part I: Thermogravimetric single cycle study and the reaction mechanism

et al. 2016

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In this study, performance of ash‐free coal (AFC) was evaluated for chemical looping combustion (CLC) using CuO as an oxygen carrier during reduction and oxidation processes in a thermogravimetric (TG) analyzer. TG experiments with CuO/AFC mixture with different ratios (10:1–50:1) at various temperatures ranging from 450 to 900 °C were performed and the results were analyzed in greater detail for the best suitable ratio (R30). The CLC reaction mechanism includes release of volatile matter until 450 °C and auto‐ decomposition of CuO at 790 °C. CuO reduction induced by volatile matter from AFC occurred at temperatures below 450 °C. Char combustion induced by oxygen release from CuO occurred at about 800 °C as auto‐decomposition of CuO occurs at 790 °C. A slight loss in mass, observed between 450 °C and 790 °C, is attributed to solid‐solid interaction of char and CuO powder. Advanced analytical techniques such as XRD, SEM, and ultimate analyses were employed to characterize the oxygen carrier and to understand the possible interaction of the oxygen carrier with volatile matter and char. Overall, AFC as the solid fuel showed a promising oxidation/reduction performance and has great potential to be used in the CLC process.

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“…The conventional technologies for CO 2 capture, i.e. pre‐combustion, oxy‐fuel, and post‐combustion capture, are costly . Beside these technologies, chemical looping combustion (CLC) has attracted many researcher's attention as a novel approach for CO 2 capture.…”

Section: Introductionmentioning

confidence: 99%

“…precombustion, oxy-fuel, and post-combustion capture, are costly. [4][5][6][7] Beside these technologies, chemical looping combustion (CLC) has attracted many researcher's attention as a novel approach for CO 2 capture. Nitrogen and CO 2 are separated inherently in a CLC system and a high purity stream of CO 2 is released.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of ash‐free coal for chemical looping combustion ‐ part II: Thermogravimetric multi‐cycle performance

et al. 2016

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In this paper, performance of AFC in CLC during multi-cycle thermogravimetric (TG) experiments was investigated. The close to stoichiometric CuO/AFC ratio of 30 is selected for the consecutive reduction and re-oxidation cyclic experiments. The reactivity of the first cycle was higher than the consecutive cycles due to the fresh CuO in the first cycle. The thermal behaviours, such as mass change in the consecutive cycles, were almost similar and there was no residual ash deposition after each cycle. Furthermore, reduction and oxidation processes were performed with different isothermal times. After 1 h the combustion was incomplete but a longer combustion period (3 h) leads to almost complete combustion. Moreover, fresh samples and solid residues were analyzed by several advanced analytical techniques including XRD, SEM, and BET. XRD analysis of the residue of CuO/AFC showed the presence of CuO at the end of the cycles; CuO and SiO 2 in residues from CuO/BL raw coal (parent coal of AFC) were shown in XRD results. At the higher temperatures (900 8C) the sintering effect and increased agglomeration were observed after each cycle. Total pore volume and average pore radius of the material decreased, however, the CLC performances at 900 8C did not reduce. The multi-cycle experiments showed AFC as a promising candidate for CLC.

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Comparison of CuO and NiO as oxygen carrier in chemical looping combustion of a Victorian brown coal

Cited by 45 publications

References 18 publications

Clean Hydrogen Production Methods

Clean Hydrogen Production Methods

Evaluation of ash‐free coal for chemical looping combustion ‐ part I: Thermogravimetric single cycle study and the reaction mechanism

Evaluation of ash‐free coal for chemical looping combustion ‐ part II: Thermogravimetric multi‐cycle performance

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