X-ray diffraction and TGA kinetic analyses for chemical looping combustion applications

Tijani, Mansour Mohammedramadan; Aqsha, Aqsha; Mahinpey, Nader

doi:10.1016/j.dib.2017.12.044

Cited by 7 publications

(7 citation statements)

References 3 publications

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“…On the basis of XRD analysis, Fe supported with ZrO 2 showed a complete reduction, while the formation of metal phase FeO and Fe 3 O 4 occurred after the reduction of Fe-supported with CeO 2 and Fe/TiO 2 , respectively. 92 Table 5 represents the OTC of Fe-based OCs prepared by different methods for the combustion of solid, liquid, and gaseous fuels. However, Fe-based OCs also were tested with spent fluid catalytic cracking (FCC) support.…”

Section: Copper Oxide (Cuo)mentioning

confidence: 98%

“…Supporting material such as Al 2 O 3 , CeO 2 , TiO 2 , and ZrO 2 have been prepared and carried out using the wetness impregnation technique for Fe-based OCs. On the basis of XRD analysis, Fe supported with ZrO 2 showed a complete reduction, while the formation of metal phase FeO and Fe 3 O 4 occurred after the reduction of Fe-supported with CeO 2 and Fe/TiO 2 , respectively Table represents the OTC of Fe-based OCs prepared by different methods for the combustion of solid, liquid, and gaseous fuels.…”

Section: Oxygen Transport Capacity Of Various Oxygen Carriersmentioning

confidence: 99%

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Recent Advances and Development of Various Oxygen Carriers for the Chemical Looping Combustion Process: A Review

Qasim

Ayoub

Ghazali

et al. 2021

Ind. Eng. Chem. Res.

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The amount of CO 2 in the atmosphere is rising due to the combustion of fossil fuels to fulfill the energy demand. The need to build cleaner and more efficient energy systems is motivated by the introduction of chemical looping combustion (CLC) as an alternative to conventional combustion by transferring oxygen. The transfer of oxygen from the air to fuel is carried out by a metal oxide known as an oxygen carrier (OC). For high fuel conversion and oxygen transport capacity, many efforts have been made for the preparation of an OC with minimal material cost. This review aims to summarize the recent advances and development of various types of OCs; particularly those developed within the previous five years are critically discussed in this paper. The main criteria for the selection of the OCs for CLC include their oxygen vacancies, oxygen transport capacities, costs, and tendencies over coke deposition, agglomeration, and attrition. OCs for CLC can be generally divided into single oxides, mixed oxides, natural mineral, spinel from mixed metal oxides, and perovskite. These have been critically discussed with their significance in CLC. The performances, advantages, and limitations of the OCs are presented and compared in detail.

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Section: Copper Oxide (Cuo)mentioning

confidence: 98%

Section: Oxygen Transport Capacity Of Various Oxygen Carriersmentioning

confidence: 99%

Recent Advances and Development of Various Oxygen Carriers for the Chemical Looping Combustion Process: A Review

Qasim

Ayoub

Ghazali

et al. 2021

Ind. Eng. Chem. Res.

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“…Taking into account that TiO 2 is still present in the particle structure further reduces the oxygen transport capacity to 1.7%. Elemental iron only would be present if ilmenite is exposed for an extremely long time to a reducing regime, called deep reduction, which is normally not realized in CLC and OCAC processes. , …”

Section: Theorymentioning

confidence: 99%

“…Elemental iron only would be present if ilmenite is exposed for an extremely long time to a reducing regime, called deep reduction, which is normally not realized in CLC and OCAC processes. 35,36 Besides ilmenite, also manganese ore seems to be a potential oxygen carrier for the OCAC concept. However, in first longterm experiences with 100 wt% calcined manganese ore in a 12 MW th CFB boiler, CO and NO emissions initially increased.…”

Section: < °+mentioning

confidence: 99%

Investigation of the Oxygen Supply and Distribution in a Bubbling Fluidized Bed by Using Natural Ilmenite for Oxygen Carrier Aided Combustion

et al. 2021

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The application of oxygen carrier materials has one of its origins in the chemical looping combustion processes, which aim at inherent CO2 sequestration by realizing fuel oxidation in the absence of combustion air. This concept can be transferred to conventional fluidized bed combustion processes, the so-called oxygen carrier aided combustion. The replacement of the conventionally applied bed material with an oxygen carrier focuses mainly on large-scale circulating fluidized bed combustion plants. The main stated performance improvements include the reduction of carbon monoxide emissions even at lower excess air ratios and the enhancement of the combustion efficiency. Nevertheless, the ability of shifting oxygen in space and time is of certain interest especially in small-scale bubbling fluidized bed systems. Imperfect fuel mixing, limited residence time in the dense bed zone, as well as limited system complexity often mitigate their combustion performance. Process conditions in bubbling fluidized beds differ from those prevalent in circulating beds regarding bed material particle size distribution, fluidization velocities, or particle volume fraction in the bed. Within this study, the widely used oxygen carrier ilmenite serves as bed material in a laboratory bubbling fluidized bed combustion. The focus was on the oxygen distribution profiles and their shift by ilmenite into the bed during methane combustion. The variation of the excess air ratio, fluidization velocity, and bed height reveal a significant increase of the in-bed CO2 yield (max. 55%) within ilmenite experiments. Moreover, the oxygen conversion profile confirms the shift of the oxygen supply by ilmenite from the lower reactor part to the reduction dominated zone. The amount of shifted oxygen increases at lower excess air ratios. Thus, full conversion is not achieved as kinetics and limited residence time in the bed inhibit the fuel conversion.

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“…Moreover, copper is cheaper than other materials used for CLC such as nickel and cobalt, and its use in oxygen carriers has fewer environmental problems (J. Adánez et al, 2018a;Tian et al, 2018;Tijani et al, 2018;Xu et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Evaluating the reactivity of CuO-TiO2 oxygen carrier for energy production technology with CO2 capture

Albuquerque¹,

Melo²,

Medeiros³

et al. 2021

RSD

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Chemical looping combustion (CLC) processes have been shown to be promising and effective in reducing CO2 production from the combustion of various fuels associated with the growing global demand for energy, as it promotes indirect fuel combustion through solid oxygen carriers (SOC). Thus, this study aims to synthesize, characterize and evaluate mixed copper and titanium oxide as a solid oxygen carrier for use in combustion processes with chemical looping. The SOC was synthesized based on stoichiometric calculations by the polymeric precursor method and characterized by: X-ray fluorescence (XRF), X-ray diffraction (XRD), Scanning Electron Microscopy (SEM-FEG) with EDS, and Programmed Temperature Reduction (PTR). The oxygen carrying capacity (ROC) and the speed index of the reduction and oxidation cycles were evaluated by Thermogravimetric Reactivity (TGA). The main reactive phase identified was: The CuO phase for the mixed copper and titanium oxide were identified and confirmed by X-ray diffraction using the Rietveld refinement method. The reactivity of the CuO-TiO2 system was high, obtaining a CH4 conversion rate above 90% and a speed index of 40%/min. Due to the structural characteristics and the reactivity tests of this material, it is concluded that mixed copper and titanium oxide have the necessary requirements to be used in chemical looping combustion (CLC) processes.

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X-ray diffraction and TGA kinetic analyses for chemical looping combustion applications

Cited by 7 publications

References 3 publications

Recent Advances and Development of Various Oxygen Carriers for the Chemical Looping Combustion Process: A Review

Recent Advances and Development of Various Oxygen Carriers for the Chemical Looping Combustion Process: A Review

Investigation of the Oxygen Supply and Distribution in a Bubbling Fluidized Bed by Using Natural Ilmenite for Oxygen Carrier Aided Combustion

Evaluating the reactivity of CuO-TiO2 oxygen carrier for energy production technology with CO2 capture

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