Distribution of NiO/Al2O3/NiAl2O4 in the Fabrication of Spray-Dry Oxygen Carrier Particles for Chemical-Looping Combustion

2011 ◽  
Vol 311-313 ◽  
pp. 1404-1410 ◽  
Author(s):  
Kyeongsook Kim ◽  
Seugran Yang ◽  
Jeom In Baek ◽  
Ji Woong Kim ◽  
Jungho Ryu ◽  
...  
Keyword(s):  
Structural Characteristics ◽  
Oxygen Carrier ◽  
Good Effect ◽  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
Oxygen Carriers ◽  
Drying Method ◽  
Cross Sectional ◽  
Spray Dry

NiO/Al2O3, known as one of the most efficient oxygen carrier, has been fabricated by spray-drying method and calcinated at 1100 °C and 1300°C, and the structural characteristics are investigated using XRD, SEM, TEM and XPS. For the characterization of surface and bulk microstructure of the fabricated NiO/Al2O3oxygen carrier particle, investigated were 1) as-fabricated powders, 2) internal structure of the crumbled particles, and 3) cross-sectional specimens. The results showed that the fabricated oxygen carrier formed well distributed NiAl2O4with NiO particles of 100~500 nm via reaction keeping on the mole ratio. The oxygen carriers developed in this study showed pertinent characteristics for chemical-looping combustion, and good effect on the strength, indicating a potential for wide application in the future. The calcination at 1100 °C was good enough and as efficient as that at 1300 °C.

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

2021 ◽  
Vol 10 (12) ◽  
pp. e514101220596
Author(s):  
Dener da Silva Albuquerque ◽  
Dulce Maria de Araújo Melo ◽  
Rodolfo Luiz Bezerra de Araújo Medeiros ◽  
Romário Cezar Pereira da Costa ◽  
Fernando Velcic Maziviero ◽  
...  
Keyword(s):  
Titanium Oxide ◽  
Structural Characteristics ◽  
Oxygen Carrier ◽  
Co2 Production ◽  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
Oxygen Carriers ◽  
X Ray Diffraction ◽  
X Ray ◽  
Solid Oxygen

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.

Preparation and Characterization of Spray-Dried Ni-Based Oxygen Carriers Added with Ceo2 for Chemical Looping Combustion

2019 ◽  
Author(s):  
Jeom-In Baek ◽  
Uisik Kim ◽  
Dong Seok Lee ◽  
Hyungeun Jo ◽  
Tae Hyoung Eom ◽  
...  
Keyword(s):  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
Oxygen Carriers ◽  
Spray Dried

scholarly journals Chemical Looping Combustion of Methane: A Technology Development View

2013 ◽  
Vol 2013 ◽  
pp. 1-15 ◽  
Author(s):  
Rutuja Bhoje ◽  
Ganesh R. Kale ◽  
Nitin Labhsetwar ◽  
Sonali Borkhade
Keyword(s):  
Technology Development ◽  
Oxygen Carrier ◽  
Clean Energy ◽  
Unit Weight ◽  
Chemical Looping Combustion ◽  
Process Conditions ◽  
Net Energy ◽  
Chemical Looping ◽  
Oxygen Carriers ◽  
Byproduct Formation

Methane is a reliable and an abundantly available energy source occurring in nature as natural gas, biogas, landfill gas, and so forth. Clean energy generation using methane can be accomplished by using chemical looping combustion. This theoretical study for chemical looping combustion of methane was done to consider some key technology development points to help the process engineer choose the right oxygen carrier and process conditions. Combined maximum product (H2O + CO2) generation, weight of the oxygen carrier, net enthalpy of CLC process, byproduct formation, CO2emission from the air reactor, and net energy obtainable per unit weight (gram) of oxygen carrier in chemical looping combustion can be important parameters for CLC operation. Carbon formed in the fuel reactor was oxidised in the air reactor and that increased the net energy obtainable from the CLC process but resulted in CO2emission from the air reactor. Use of CaSO4as oxygen carrier generated maximum energy (−5.3657 kJ, 800°C) per gram of oxygen carrier used in the CLC process and was found to be the best oxygen carrier for methane CLC. Such a model study can be useful to identify the potential oxygen carriers for different fuel CLC systems.

scholarly journals Comparison of oxygen carriers for chemical-looping combustion

2006 ◽  
Vol 10 (3) ◽  
pp. 93-107 ◽  
Author(s):  
Marcus Johansson ◽  
Tobias Mattisson ◽  
Anders Lyngfelt
Keyword(s):  
Fossil Fuels ◽  
Oxygen Carrier ◽  
High Reactivity ◽  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
Oxygen Carriers ◽  
Reducing Conditions ◽  
Different Temperatures ◽  
Combustion Technology ◽  
Separation Of Co2

Chemical-looping combustion is a combustion technology with inherent separation of the greenhouse gas CO2. This technique involves combustion of fossil fuels by means of an oxygen carrier which transfers oxygen from the air to the fuel. In this manner a decrease in efficiency is avoided for the energy demanding separation of CO2 from the rest of the flue gases. Results from fifty oxygen carriers based on iron-, manganese- and nickel oxides on different inert materials are compared. The particles were prepared using freeze granulation, sintered at different temperatures and sieved to a size 125-180 mm. To simulate the environment the particles would be exposed to in a chemical-looping combustor, reactivity tests under alternating oxidizing and reducing conditions were performed in a laboratory fluidized bed-reactor of quartz. Reduction was performed in 50% CH4/50% H2O while the oxidation was carried out in 5% O2 in nitrogen. In general nickel particles are the most reactive, followed by manganese. Iron particles are harder but have a lower reactivity. An increase in sintering temperatures normally leads to an increase in strength and decrease in reactivity. Several particles investigated display a combination of high reactivity and strength as well as good fluidization behavior, and are feasible for use as oxygen carriers in chemical-looping combustion.

The Performance Research on Reaction of Fe2O3/Al2O3 Oxygen Carrier and CO in Chemical-Looping Combustion Process

2012 ◽  
Vol 550-553 ◽  
pp. 974-978
Author(s):  
Wen Yan Li ◽  
Xing Lei Liu ◽  
Qiu Luan Chen ◽  
Feng Ming Chu
Keyword(s):  
Oxygen Carrier ◽  
Combustion Process ◽  
Kinetic Mechanism ◽  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
Oxygen Carriers ◽  
Novel Technology ◽  
Mechanism Function ◽  
Tg And Dtg ◽  
Performance Research

Chemical-looping combustion (CLC) is a novel technology, which has inherent property of separating the greenhouse gas CO2, which uses oxygen carriers to transfer oxygen for combustion from air to fuel. The reactivity of Fe2O3/Al2O3 oxygen carrier was assessed by measuring their ability to oxidize CO. The kinetics and mechanism of oxygen carrier have been studied by TG and DTG techniques. The kinetic mechanism function of the reaction between Fe2O3/Al2O3 and CO has been built using the Coats-Redfern equation.

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