Self-assembly template combustion synthesis of a core–shell CuO@TiO2–Al2O3 hierarchical structure as an oxygen carrier for the chemical-looping processes

Xu, Zuwei; Zhao, Haibo; Wei, Yijie; Chen, Zheng

doi:10.1016/j.combustflame.2015.05.006

Cited by 58 publications

(32 citation statements)

References 49 publications

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“…This core−shell structure was effectively helpful for the high performance of synthetic oxygen carrier in a previous study. 52 This way, the reaction between CaO and Al 2 O 3 was prevented in the subsequent carbonation/calcination cycles. A schematic sketch of preparation process of SATS-derived CaO/TiO 2 −Al 2 O 3 is presented in Figure 5.…”

Section: Physicochemical Characterizations Of Cao-basedmentioning

confidence: 99%

Tailor-Made Core–Shell CaO/TiO₂–Al₂O₃ Architecture as a High-Capacity and Long-Life CO₂ Sorbent

Peng

Luo

et al. 2015

Environ. Sci. Technol.

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CaO-based sorbents are widely used for CO2 capture, steam methane reforming, and gasification enhancement, but the sorbents suffer from rapid deactivation during successive carbonation/calcination cycles. This research proposes a novel self-assembly template synthesis (SATS) method to prepare a hierarchical structure CaO-based sorbent, Ca-rich, Al2O3-supported, and TiO2-stabilized in a core-shell microarchitecture (CaO/TiO2-Al2O3). The cyclic CO2 capture performance of CaO/TiO2-Al2O3 is compared with those of pure CaO and CaO/Al2O3. CaO/TiO2-Al2O3 sorbent achieved superior and durable CO2 capture capacity of 0.52 g CO2/g sorbent after 20 cycles under the mild calcination condition and retained a high-capacity and long-life performance of 0.44 g CO2/g sorbent after 104 cycles under the severe calcination condition, much higher than those of CaO and CaO/Al2O3. The microstructure characterization of CaO/TiO2-Al2O3 confirmed that the core-shell structure of composite support effectively inhibited the reaction between active component (CaO particles) and main support (Al2O3 particles) by TiO2 addition, which contributed to its properties of high reactivity, thermal stability, mechanical strength, and resistance to agglomeration and sintering.

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Section: Physicochemical Characterizations Of Cao-basedmentioning

confidence: 99%

Tailor-Made Core–Shell CaO/TiO₂–Al₂O₃ Architecture as a High-Capacity and Long-Life CO₂ Sorbent

Peng

Luo

et al. 2015

Environ. Sci. Technol.

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“…16 The isoelectric point (IEP) of the obtained TiO 2 nanoparticles was approximately 3.4 and lower than that of other phases (including anatase, mixture of anatase and rutile), 17 which was pivotal to design novel devices for applications in sensing, catalysis and energy conversion. The resultant TiO 2 powder was dispersed in 10.0 mL of NaOH solution to give a 5 mg · mL −1 TiO 2 suspension by ultrasonic agitation.…”

Section: Methodsmentioning

confidence: 99%

Hemin Modified TiO₂Nanoparticles with Enhanced Photoelectrocatalytic Activity for Electrochemical and Photoelectrochemical Sensing

Zhu

Yan

et al. 2016

J. Electrochem. Soc.

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Hemin-functionalized TiO 2 nanoparticles were prepared and assembled on glassy carbon electrode through the electrostatic attraction between positively charged poly(diallyldimethylammonium chloride) and negatively charged hemin and TiO 2 . The scanning electron microscopy and X-ray diffraction characterization showed that the assembled hemin-TiO 2 film displayed a mesoporous structure comprising plenty of TiO 2 nanoparticles in rutile phase. The Fourier transform infrared spectra and UV-visible diffuse reflectance spectra indicated that hemin was successfully incorporated into TiO 2 film and significantly enhanced the absorption of TiO 2 film to visible light. The hemin-TiO 2 film exhibited a pair of well-defined redox peaks of hemin by cyclic voltammetry, which could effectively catalyze the electroreduction of H 2 O 2 . Thus, the hemin-TiO 2 modified electrode was employed as an electrochemical sensor for H 2 O 2 determination, showing a sensitive response linearly proportional to the concentration of H 2 O 2 from 3.0 × 10 −7 to 4.7 × 10 −4 mol · L −1 . At the same time, the photoelectrocatalytic activity of TiO 2 under visible light illumination was dramatically promoted by hemin. The hemin-TiO 2 modified electrode produced a photoelectrochemical response linearly proportional to hydroquinone in the concentration range from 4. Hemin is an iron-containing porphyrin, namely protoporphyrin IX Fe(III) complex, which is well-known as the active center of the hemeprotein family. Because of the reversible reaction of Fe(III)/Fe(II) redox couple, hemin has been extensively demonstrated as an efficient electrocatalyst for many small molecules such as hydrogen peroxide, 1-3 oxygen, 4 nitrite, 5 L-tyrosine 6 and artemisinin. 7 Generally, hemin is loaded on some supporting materials to avoid the molecular aggregation of hemin molecules in aqueous solution and improve the stability and activity of catalyst.8 On the other hand, hemin is a structural analogue of chlorophyll, which can serve as a promising photosensitizer for TiO 2 photocatalyst to harvest visible light. 9,10 Moreover, the presence of Fe(III) porphyrin ring on the surface of TiO 2 can reduce the electron-hole recombination rate and act as a mediator for continuous production of enriched concentration of hydroxyl radicals to enhance the photocatalytic activity of TiO 2 . 11TiO 2 is the most intensively studied photocatalyst for degradation of various organic pollutants.12 In recent years, TiO 2 nanomaterials have been widely utilized for fabrication of sensing devices because of their fascinating properties such as large surface area, good biocompatibility, high stability, and unique electronic and photocatalytic performances.13 When catalytic materials including metal nanoparticles, small molecules and biological macromolecules are immobilized on nanostructured TiO 2 , the obtained nanocomposites can act as bifunctional catalysts which not only possess the catalytic activity of introduced materials but also preserve the intrinsic photocatalytic capacity of T...

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“…This core-shell structure demonstrates high resistance to thermal shock, high chemical resistance, low electrical and thermal conductivities, high heat capacity and many other desirable properties 1,3,4,5,7,8,9,10,11 .…”

Section: Introductionmentioning

confidence: 99%

“…Doped metal ions in the core or shell can change physical and chemical properties in the final core shell composite 7,9,10,11,12 . γ-Al 2 O 3 and TiO 2 have been produced by various methods, such as sol-gel, co-precipitation, and hydrothermal treatment.…”

Section: Introductionmentioning

confidence: 99%

Resistant in Alkaline Media Core-Shell Photocatalyst of Fe (TiO2/ Al2O3) for Degradation of Water Pollutant

Haghighaty¹,

Dehaghi²

2018

Orient. J. Chem

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In this research, initially after preparing γ-alumina and Fe(III) doped γ-alumina prepared by the sol-gel method, the initial calcination of the sols was carried out for 3 h at 300 o C and the obtained pulverized solid crystals were added into two sol-gel containers consisting of titanium tetra iso-propoxide (TTiP) and Fe(III) doped TTiP . After homogenization, the new sol was for 24 h and calcinated for 4 h at 600 o C. After the process of washing and purification, the core-shells were prepared and characterized. The photocatalytic properties were compared to those of the pure TiO 2 , which had been prepared by the sol-gel method. Some of the properties of these new synthesized particles include increased effective surface area of TiO 2 intake feed, increased activity of photocatalytic properties in terms of the alkaline pH, and enhanced strength of the core shell particles in the process of mechanical separation during the reactivation steps up to 10 times of recovery. Photocatalytic activity was examined by degradation of methylen blue. Doping Fe (III) in the core of γ-alumina, increased the mechanical stability while doping Fe (III) in the TiO 2 shell decreased the time of degradation and increased the stability of the catalyst in an alkaline solution to a pH of about 12.

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Self-assembly template combustion synthesis of a core–shell CuO@TiO2–Al2O3 hierarchical structure as an oxygen carrier for the chemical-looping processes

Cited by 58 publications

References 49 publications

Tailor-Made Core–Shell CaO/TiO₂–Al₂O₃ Architecture as a High-Capacity and Long-Life CO₂ Sorbent

Tailor-Made Core–Shell CaO/TiO₂–Al₂O₃ Architecture as a High-Capacity and Long-Life CO₂ Sorbent

Hemin Modified TiO₂Nanoparticles with Enhanced Photoelectrocatalytic Activity for Electrochemical and Photoelectrochemical Sensing

Resistant in Alkaline Media Core-Shell Photocatalyst of Fe (TiO2/ Al2O3) for Degradation of Water Pollutant

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Self-assembly template combustion synthesis of a core–shell CuO@TiO2–Al2O3 hierarchical structure as an oxygen carrier for the chemical-looping processes

Cited by 58 publications

References 49 publications

Tailor-Made Core–Shell CaO/TiO2–Al2O3 Architecture as a High-Capacity and Long-Life CO2 Sorbent

Tailor-Made Core–Shell CaO/TiO2–Al2O3 Architecture as a High-Capacity and Long-Life CO2 Sorbent

Hemin Modified TiO2Nanoparticles with Enhanced Photoelectrocatalytic Activity for Electrochemical and Photoelectrochemical Sensing

Resistant in Alkaline Media Core-Shell Photocatalyst of Fe (TiO2/ Al2O3) for Degradation of Water Pollutant

Contact Info

Product

Resources

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Tailor-Made Core–Shell CaO/TiO₂–Al₂O₃ Architecture as a High-Capacity and Long-Life CO₂ Sorbent

Tailor-Made Core–Shell CaO/TiO₂–Al₂O₃ Architecture as a High-Capacity and Long-Life CO₂ Sorbent

Hemin Modified TiO₂Nanoparticles with Enhanced Photoelectrocatalytic Activity for Electrochemical and Photoelectrochemical Sensing