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

Data in Brief ◽  
2018 ◽  
Vol 17 ◽  
pp. 200-209 ◽  
Author(s):  
Mansour Mohammedramadan Tijani ◽  
Aqsha Aqsha ◽  
Nader Mahinpey
Keyword(s):  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
X Ray Diffraction ◽  
X Ray

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.

Experimental Investigation of Chemical Looping Combustion of CO with Fe-Based Oxygen Carrier

2014 ◽  
Vol 986-987 ◽  
pp. 72-75
Author(s):  
Qu Li ◽  
Chang Feng Lin ◽  
Jun Jiao Zhang ◽  
Wei Liang Cheng ◽  
Wu Qin
Keyword(s):  
Experimental Investigation ◽  
Oxygen Carrier ◽  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
Oxygen Carriers ◽  
Thermo Gravimetric ◽  
Cu Doping ◽  
X Ray

Reaction activities of Ni-doped and Cu-doped Fe2O3 oxygen carriers (OCs) with CO were investigated using thermo gravimetric (TG-DTG).The structures of the prepared OC were characterized by X-ray diffract meter (XRD).TG-DTG investigations indicated that rational Ni and Cu doping could efficiently enhance the reactivity of Fe-base oxygen carrier for oxidizing CO under different conditions. And Fe-based OC doped with 20 wt. % Ni can realize the highest reactivity.

Experimental Study on Coal Chemical Looping Combustion Using CuFe2O4 as Oxygen Carrier

2013 ◽  
Vol 805-806 ◽  
pp. 1387-1390
Author(s):  
Lei Wang ◽  
Wu Qin ◽  
Ling Nan Wu ◽  
Xue Qing Hu ◽  
Ming Zhong Gao ◽  
...  
Keyword(s):  
Carbon Dioxide Capture ◽  
Oxygen Carrier ◽  
Raw Material ◽  
Bet Surface Area ◽  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
Sem Images ◽  
X Ray ◽  
Thermogravimetric Analyzer ◽  
The Cost

Chemical-looping combustion (CLC) has been proposed as an efficient and clean technology that could contribute to achieve carbon dioxide capture with negligible cost. The technology uses a metal oxide as oxygen carrier that indirectly transfer oxygen from air to fuels to oxidize the fuels. CuFe2O4 was prepared as a novel oxygen carrier to decrease the cost of raw material and increase the reactivity of iron-based oxygen carrier. The structure of the prepared oxygen carrier was characterized by scanning electron microscope (SEM) and an X-ray diffractometer (XRD). The reaction of CuFe2O4 with coal was tested in a thermogravimetric analyzer (TGA). Results showed that the pyrolysis of coal under CO2 was more complete than that under N2, and the final conversion of CuFe2O4 during CLC of coal reached 66.6%. SEM images and BET surface area of the fresh and the used oxygen carrier show little agglomeration during the process.

scholarly journals Development of CuO-based oxygen carriers supported on diatomite and kaolin for chemical looping combustion

2021 ◽  
Vol 10 (4) ◽  
pp. e15110412831
Author(s):  
Romário Cezar Pereira da Costa ◽  
Rebecca Araújo Barros do Nascimento ◽  
Dulce Maria de Araújo Melo ◽  
Dener Silva Albuquerque ◽  
Rodolfo Luiz Bezerra de Araújo Medeiros ◽  
...  
Keyword(s):  
Reaction Rate ◽  
Direct Reduction ◽  
Oxygen Carrier ◽  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
Impregnation Method ◽  
Oxygen Carriers ◽  
Fuel Gas ◽  
Promising Alternative ◽  
X Ray

Chemical Looping Combustion (CLC) technology has emerged as a promising alternative capable of restricting the effects of global warming due to anthropogenic gas emissions, especially CO2, through its inherent capture. This study aims to synthesize and evaluate Cu-based oxygen carriers supported on natural materials such as diatomite and kaolin, through the incipient wet impregnation method for CLC process applications. Oxygen carriers were characterized by X-ray diffraction (XRD), temperature-programmed reduction (TPR), and scanning electron microscopy with surface energy dispersive x-ray spectroscopy (SEM-EDS). The mechanical strength of the two oxygen carrier particles was determined after the sintering procedure resulting in high crushing force. Reactivity of oxygen carriers was evaluated in a thermobalance with CH4 and H2 gases. Different reaction pathways were attempted when undergoing the redox cycles: total direct reduction of CuO to Cu0 for Cu-K and partial reduction of CuO to Cu2O and CuO to Cu-D. However, the highest reactivity and reaction rate was achieved in Cu-D due to the pore structure of diatomite, the chemical composition and the resulting interaction between CuO and the support. H2 gas reactivity tests showed a higher conversion rate and greater stability between cycles for both oxygen carriers. Thus, the reducible CuO content present in Cu-Diatomite during the reactivity test with H2 as the fuel gas was ideal for achieving high solids conversion, tendency for greater stability and a higher reaction rate.

Reactivity and Stability of a New Fe-Based Oxygen Carrier for Chemical-Looping Combustion

2012 ◽  
Vol 616-618 ◽  
pp. 1680-1683
Author(s):  
Wu Qin ◽  
Lei Wang ◽  
Ling Nan Wu ◽  
Chang Qing Dong ◽  
Yong Ping Yang
Keyword(s):  
Corn Starch ◽  
Carbon Dioxide Capture ◽  
Oxygen Carrier ◽  
Coal Ash ◽  
Inorganic Membrane ◽  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
X Ray ◽  
Thermogravimetric Analyzer ◽  
Temperature Programmed

Chemical-looping combustion (CLC) has been proposed as an efficient and clean technology that could contribute to achieve carbon dioxide capture with negligible cost. The technology uses a metal oxide as oxygen carrier that indirectly transfer oxygen from air to fuels so as to oxidize the fuels. This paper presents a new inorganic membrane Fe-based oxygen carrier prepared by mixing Fe2O3 and coal ash with certain proportion of corn starch (10.0 wt.%, 20.0 wt.%, and 30.0 wt.%). The structure of the prepared oxygen carrier was characterized by scanning electron microscope (SEM) and an X-ray diffractometer (XRD). The activity of the prepared oxygen carrier was measured by performing thermogravimetric analyzer (TGA) experiments and Temperature programmed desorption (TPD) experiments. Results show that the inorganic membrane Fe-based oxygen carrier has higher reduction reactivity and stability than the conventional oxygen carrier.

The Use of Advanced Analytical Techniques for Characterization of the Chemical, Physical, and Crystallographic Nature of a Surface

1973 ◽  
Vol 31 ◽  
pp. 132-133 ◽  
Author(s):  
R. E. Herfert
Keyword(s):  
Surface Characterization ◽  
Analytical Techniques ◽  
X Ray Diffraction ◽  
Depth Of Penetration ◽  
X Ray ◽  
The Past ◽  
Transmission Electron ◽  
Scanning Electron

Studies of the nature of a surface, either metallic or nonmetallic, in the past, have been limited to the instrumentation available for these measurements. In the past, optical microscopy, replica transmission electron microscopy, electron or X-ray diffraction and optical or X-ray spectroscopy have provided the means of surface characterization. Actually, some of these techniques are not purely surface; the depth of penetration may be a few thousands of an inch. Within the last five years, instrumentation has been made available which now makes it practical for use to study the outer few 100A of layers and characterize it completely from a chemical, physical, and crystallographic standpoint. The scanning electron microscope (SEM) provides a means of viewing the surface of a material in situ to magnifications as high as 250,000X.

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