Screening of supported and unsupported Mn–Si oxygen carriers for CLOU (chemical-looping with oxygen uncoupling)

Frick, Volkmar; Rydén, Magnus; Leion, Henrik; Mattisson, Tobias; Lyngfelt, Anders

doi:10.1016/j.energy.2015.09.017

Cited by 29 publications

(14 citation statements)

References 22 publications

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“…In order to obtain an ever more economical oxygen carrier for CLOU process, the search for other Cu-free materials based mainly on manganese oxides with oxygen uncoupling capability has been promoted. Among these materials, the oxygen carriers based on CaMnperovskites [43], materials based on Mn-Si [44], and the solids formed by combining manganese-iron oxides [45] are worthy of note. The use of both CaMn-based perovskites [46] and Mn-Si mixed oxide particles [47] showed improved performance compared to iG-CLC when they were tested in CLC units, although not as good as the performance shown by Cu-based materials.…”

Section: Similar Differences In Performance Between Both Types Of Chementioning

confidence: 99%

Chemical Looping Combustion of gaseous and solid fuels with manganese-iron mixed oxide as oxygen carrier

Pérez-Vega

Abad

Gayán

et al. 2018

Energy Conversion and Management

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Synthetic manganese-iron mixed oxides are considered promising materials to be used as oxygen carriers for Chemical Looping Combustion of coal with carbon dioxide capture at low cost. The aim of this work was to evaluate a manganese-iron mixed oxide material with a manganese to iron molar ratio of 0.77:0.23 as oxygen carrier for coal combustion by means of chemical looping processes, including both ex-situ and in-situ gasification of coal. The preparation method-spray drying followed by calcination-was optimized in order to produce particles with high reactivity and mechanical strength. The material was studied in two continuously operated facilities designed to burn either gaseous or solid fuels. While full combustion was achieved burning syngas, showing the feasibility of the use of this material considering the ex-situ gasification process. Coal combustion efficiency by in-situ gasification process was improved in comparison with other previously tested low-cost materials such as ilmenite and iron ore. Moreover, the oxygen carrier particles showed an interesting magnetic behavior that was able to facilitate oxygen carrier recovery from the

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Section: Similar Differences In Performance Between Both Types Of Chementioning

confidence: 99%

Chemical Looping Combustion of gaseous and solid fuels with manganese-iron mixed oxide as oxygen carrier

Pérez-Vega

Abad

Gayán

et al. 2018

Energy Conversion and Management

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“…The Mn/Si ratio was the same for all of the particles while the TiO 2 content and sintering temperature were varied. These are particles that have known CLOU properties [26], other types of Mn/Si particles have been tested in other work [19,[27][28][29]. There are many other ways to produce particles [30], but particle production is not necessary.…”

Section: Particlesmentioning

confidence: 99%

Experimental Method and Setup for Laboratory Fluidized Bed Reactor Testing

2018

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A small laboratory fluidized bed reactor is used to test the chemical reactivity of solid particles fluidized with a gas. The novelty of the system is that it can be used for testing any solid particles, and, in this work, oxygen carriers with Mn/Si oxide supported on TiO2 are used to present the possibilities and layout of the laboratory system. The system is equipped with automatic valves that make it possible to rapidly change the gas conditions in the reactor. The setup facilitates solid particle testing using a sample of a few grams with gas-solid contact conditions relevant for a full-scale fluidized bed. With this small system, it is possible to mimic a section or a part of a larger system. It is also possible to test extreme conditions that can occur in a bigger unit. The system is designed for determining chemical reactivity in combustion, gasification, and reforming, but it can be used for investigating any type of gas-solid reaction in fluidized bed conditions. The setup presented here is one of the smallest possible devices that can be realized while maintaining fluidized bed conditions.

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“…The selection of raw materials, including active ingredients and inert carrier, is the key to the preparation of the OC by spray drying. Many kinds of OCs have been synthesized by spray drying, such as Fe-based, − Ni-based, − Cu-based, , and Mn-based − OCs. The effect of an inert carrier on the performance of OCs has been investigated.…”

Section: Introductionmentioning

confidence: 99%

Using Copper Ore and Hematite Fine Particles as Raw Materials of an Oxygen Carrier for Chemical Looping Combustion of Coal: Spray Drying Granulation and Performance Evaluation

Wang

et al. 2020

Energy Fuels

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Spray drying has gradually become an effective method for large-scale preparation of oxygen carriers as a result of its unique advantages (high efficiency, scalable production, etc.). However, expensive chemical or commercial powder is usually used as raw material in spray drying granulation. The main objective of this work is to reduce the cost of a spray-drying-derived oxygen carrier through using cheap natural ores as raw materials and optimizing the preparation process. Considering that hematite is cheap but less active in chemical looping combustion (CLC) processes, while copper ore has high oxygen carrying capacity and good reactivity but suffers from sintering at a high temperature, the bi-ore oxygen carrier is prepared by the spray drying granulation method in this work using copper ore and hematite fine powders as raw materials with the addition of a suitable dispersant and binder. Two kinds of oxygen carriers are successfully prepared by the spray drying method, Fe100 (the mass ratio of hematite is 100%) and Cu20Fe80 (the mass ratio of copper ore/hematite is 20:80%), and their performance is evaluated in a batch fluidized bed reactor. The reactivity of Cu20Fe80 is superior than that of Fe100 to char gasification products. The effects of the temperature, oxygen/fuel ratio, and coal rank on the coal-derived CLC performance of Cu20Fe80 are further examined. The temperature of 950 °C is the optimal choice with the highest reaction rate and CO2 yield. The gasification rate is fast using the low-rank coals as fuels, i.e., Chifeng lignite and Shenhua bituminous coal. Moreover, Cu20Fe80 exhibits good stability during the redox test of more than 10 cycles. The used oxygen carrier particles still maintain the abundant pore structure well without the sintering phenomenon. Additionally, the results of scanning electron microscopy with energy-dispersive spectrometry indicate that there is almost no decrease in the relative content of Cu elements after the cyclic tests. This work demonstrates that the spray-drying-derived Cu20Fe80 particle is a promising choice as an oxygen carrier for industrial application of the CLC process.

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Screening of supported and unsupported Mn–Si oxygen carriers for CLOU (chemical-looping with oxygen uncoupling)

Cited by 29 publications

References 22 publications

Chemical Looping Combustion of gaseous and solid fuels with manganese-iron mixed oxide as oxygen carrier

Chemical Looping Combustion of gaseous and solid fuels with manganese-iron mixed oxide as oxygen carrier

Experimental Method and Setup for Laboratory Fluidized Bed Reactor Testing

Using Copper Ore and Hematite Fine Particles as Raw Materials of an Oxygen Carrier for Chemical Looping Combustion of Coal: Spray Drying Granulation and Performance Evaluation

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