Chemical Looping Particles

Gupta, Puneet; Li, Fanxing; Velazquez-Vargas, Luis G.; Sridhar, Deepak; Iyer, Mahesh V.; Ramkumar, Shwetha; Fan, Liang‐Shih

doi:10.1002/9780470872888.ch2

Cited by 5 publications

(6 citation statements)

References 105 publications

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“…The common range of the SSA of chemical looping particles is 3 -100 m²/g. [95,111,112] To analyze the dispersion of the gas pulses by the pulse valves and the dispersion effects of the reactor a wide series of residence time analyses experiments were carried out. Several effects contribute to the gas pulse dispersion as the amount of catalyst, the temperature profile of the furnace and the initial gas flow rate.…”

Section: Dynamic Experimentsmentioning

confidence: 99%

Investigation of the surface reaction network of the oxidative coupling of methane over Na2WO4/Mn/SiO2 catalyst by temperature programmed and dynamic experiments

Fleischer

Rolf

Parishan

et al. 2016

Journal of Catalysis

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The present thesis was performed and issued at the Technical Chemistry Department of the Chemistry Institute at the Technische Universität Berlin, in the framework of "Unicat" (Unifying Concepts in Catalysis) project as a part of the subproject D1/E1, "Activation of Methane". First of all, I would like to thank my supervisor Prof. Dr. Reinhard Schomäcker, for admitting me into his research group, for the supervision of my work and giving me the chance to achieve this milestone. I would also like to thank Prof. Dr. Robert Schlögl for the second supervision. I thank Prof. Dr.-Ing. Ulrich Nieken as my external examiner. I thank also Dr. Patrick Littlewood and Samira Parishan for great discussions about the development of the setup, the OCM and also experimental techniques in general. Further I like to thank all colleagues in the research group of Prof.

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Section: Dynamic Experimentsmentioning

confidence: 99%

Investigation of the surface reaction network of the oxidative coupling of methane over Na2WO4/Mn/SiO2 catalyst by temperature programmed and dynamic experiments

Fleischer

Rolf

Parishan

et al. 2016

Journal of Catalysis

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“…The disadvantages of the first route are the difficulties associated with gasification and the need for an energy intensive air separation unit. The second route is to introduce directly the solid fuels to the fuel reactor. – The fuel reactor would act as a gasifier, where the solid fuels react with water steam or CO 2 , an oxidizer, where gaseous compounds are oxidized by the metal oxide, and a reducer, where the metal oxide is reduced to the metallic form. Here, the following technical problems must be solved: including the interaction between fuel ash and oxygen carriers, the separation of fuel particles from the oxygen carriers, the process analysis, the potential oxygen carriers, etc.…”

Section: Introductionmentioning

confidence: 99%

“…However, as far as CLC by solid fuels is considered, the reduction reactivity between the solid fuels and the solid oxygen carriers is the primary technical concern. Fan and co-workers , investigated the reduction reactivity between coal and Fe 2 O 3 , in which a good reaction above 1023 K leading to high conversions to Fe is observed. Lyngfelt and co-workers demonstrated the feasibility of using petroleum coke in CLC supported by Fe 2 O 3 /MgAl 2 O 4 oxygen carriers.…”

Section: Introductionmentioning

confidence: 99%

Sol–Gel-Derived NiO/NiAl₂O₄ Oxygen Carriers for Chemical-Looping Combustion by Coal Char

et al. 2008

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Chemical-looping combustion (CLC) is a very promising technology to combine the energy-utilization situation in China and CO2 zero-emission in situ allowing for CO2 sequestration by efficient and energy-saving ways and without nitrogen oxide (NO x ) formation. Having an oxygen carrier with sufficient reactivities in reduction and oxidation and enough recyclability and strength for long-term operation is one of the key issues of the CLC process. This paper focuses on the investigation of Ni-based oxygen carriers for CLC by coal char. First, Al(OC3H7)3 and Ni(NO3)2 are selected as the main raw materials to prepare sol–gel-derived NiO/NiAl2O4 oxygen carriers. The oxygen carrier with a mass content of 60% NiO, a sintering temperature of 1300 °C, and a sintering time of 6 h performs comparatively well. Second, the reduction reaction of the NiO/NiAl2O4 oxygen carriers with char and the circular reduction/oxidation reactions of the NiO/NiAl2O4 oxygen carriers with char/air or hydrogen/air are carried out in a thermogravimetric analysis (TGA) instrument to investigate the reactivities and chemical life of the prepared NiO/NiAl2O4 oxygen carriers. The experimental results show that (a) when the TGA temperature is higher than 850 °C, NiO/NiAl2O4 starts to react with coal char rapidly, which indicates that CLC of coal char using NiO/NiAl2O4 as oxygen carriers is a feasible technology of energy utilization in principle; (b) NiO/NiAl2O4, which maintains its activity over single-cycle reduction/oxidation reactions with char/air or multiple-cycle reduction/oxidation reactions with hydrogen/air, exhibits extremely good recyclablity; (c) the porous beehive structure of the NiO/NiAl2O4 particle is maintained, and the sintering behavior between different particles is not observed during cyclic studies. Those experimental results prove the sol–gel-derived oxygen carrier NiO/NiAl2O4 is capable of being used in chemical-looping combustion fueled by coal char or H2.

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“…In comparison to catalytic reforming of methane to syngas, the chemical looping routs show the advantage of directly producing of high-quality syngas with an ideal H 2 /CO ratio, which makes it suitable for direct methanol production or Fischer−Tropsch synthesis. 30,32,53,54,108,109 In addition, the CL-POM process avoids the explosion risk of premixed CH 4 /O 2 mixtures at elevated temperatures and the expensive cost of using pure oxygen. 3,55 The CL-DRM process simultaneously eliminates two major greenhouse gases (CO 2 and CH 4 ).…”

Section: Chemical Looping Reforming Of Methanementioning

confidence: 99%

“…Subsequently, regenerated OCs are retransferred to the fuel reactor for recycling. In comparison to catalytic reforming of methane to syngas, the chemical looping routs show the advantage of directly producing of high-quality syngas with an ideal H 2 /CO ratio, which makes it suitable for direct methanol production or Fischer–Tropsch synthesis. ,,,,, In addition, the CL-POM process avoids the explosion risk of premixed CH 4 /O 2 mixtures at elevated temperatures and the expensive cost of using pure oxygen. , The CL-DRM process simultaneously eliminates two major greenhouse gases (CO 2 and CH 4 ). More importantly, the additional high-purity H 2 or CO stream is produced from the air reactor without additional purification work when using H 2 O and CO 2 as oxidants .…”

Section: Chemical Looping Reforming Of Methanementioning

confidence: 99%

Chemical Looping Conversion of Gaseous and Liquid Fuels for Chemical Production: A Review

Xing-yun

et al. 2020

Energy Fuels

106

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Chemical looping technology enables achievement of the simultaneous feedstock conversion and product separation without additional processes via circulating solid intermediates (so-called oxygen/nitrogen carriers) in a redox process, which contributes to the improvement of product selectivity and energy conservation. In general, methane, CO 2 , N 2 , ethane, propane, ethanol, and glycerol are typical gaseous and liquid fuels for producing syngas, pure H 2 , pure CO, NH 3 , ethylene, and propylene via the chemical looping process. Central to this technology is the solid intermediates that act as reservoirs for storing and releasing O or N in multiple sub-reactions to close the loop. This work comprehensively describes the chemical looping conversion of gaseous or liquid fuels for chemical production, covering chemical looping reforming of methane, chemical looping oxidative coupling of methane, chemical looping reforming of liquid fuels, chemical looping oxidative dehydrogenation, and chemical looping ammonia synthesis technologies. Specifically, this review mainly focuses on the development of oxygen/nitrogen carrier materials, especially the related research in China. The effects of composition, structure, and morphology on the performance and related reaction mechanisms are discussed.

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Chemical Looping Particles

Cited by 5 publications

References 105 publications

Investigation of the surface reaction network of the oxidative coupling of methane over Na2WO4/Mn/SiO2 catalyst by temperature programmed and dynamic experiments

Investigation of the surface reaction network of the oxidative coupling of methane over Na2WO4/Mn/SiO2 catalyst by temperature programmed and dynamic experiments

Sol–Gel-Derived NiO/NiAl₂O₄ Oxygen Carriers for Chemical-Looping Combustion by Coal Char

Chemical Looping Conversion of Gaseous and Liquid Fuels for Chemical Production: A Review

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Chemical Looping Particles

Cited by 5 publications

References 105 publications

Investigation of the surface reaction network of the oxidative coupling of methane over Na2WO4/Mn/SiO2 catalyst by temperature programmed and dynamic experiments

Investigation of the surface reaction network of the oxidative coupling of methane over Na2WO4/Mn/SiO2 catalyst by temperature programmed and dynamic experiments

Sol–Gel-Derived NiO/NiAl2O4 Oxygen Carriers for Chemical-Looping Combustion by Coal Char

Chemical Looping Conversion of Gaseous and Liquid Fuels for Chemical Production: A Review

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Sol–Gel-Derived NiO/NiAl₂O₄ Oxygen Carriers for Chemical-Looping Combustion by Coal Char