Enhanced catalytic performance of CeO2 confined inside carbon nanotubes for dehydrogenation of ethylbenzene in the presence of CO2

Rao, R. Prasada; Zhang, Qingyun; Liu, Huade; Yang, Hongxiao; Ling, Qiang; Yang, Ming; Zhang, Aimin; Chen, Wei

doi:10.1016/j.molcata.2012.07.003

Cited by 41 publications

(21 citation statements)

References 59 publications

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“…As shown in Fig. 5c, the O 1s peak is primarily composed of two peaks centered at 529.1 and 531.4 eV, which are due to the lattice oxygen of CeO 2 (Rao et al 2012) and the hydroxyl oxygen on the surface of CNTs or adsorbed oxygen from CeO 2 (Lakshminarayanan et al 2004). In addition, the core level peak, which was located at 529.1 eV, indicated the existence of O 2- ).…”

Section: Xrdmentioning

confidence: 93%

“…Kang et al (Kang et al 2005) loaded platinum on CNTs to enhance the structural stability and electronic property of the CNTs. In addition, Rao et al (Rao et al 2012) prepared a CeO 2 /CNTs composite catalyst to dehydrogenate and oxidize ethylbenzene to styrene in a carbon dioxide atmosphere. Peng et al (Peng et al 2005) utilized CeO 2 loaded with CNTs to remove arsenate in water.…”

Section: Introductionmentioning

confidence: 99%

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Preparation, characterization of a ceria loaded carbon nanotubes nanocomposites photocatalyst and degradation of azo dye Acid Orange 7

Wen

Tang

Chen

et al. 2016

Archives of Environmental Protection

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Abstract:A ceria loaded carbon nanotubes (CeO 2 /CNTs) nanocomposites photocatalyst was prepared by chemical precipitation, and the preparation conditions were optimized using an orthogonal experiment method. HR-TEM, XRD, UV-Vis/DRS, TGA and XPS were used to characterize the photocatalyst. Nitrogen adsorption-desorption was employed to determine the BET specifi c surface area. The results indicated that the photocatalyst has no obvious impurities. CeO 2 was dispersed on the carbon nanotubes with a good loading effect and high loading effi ciency without agglomeration. The catalyst exhibits a strong ability to absorb light in the ultraviolet region and some ability to absorb light in the visible light region. The CeO 2 /CNTs nanocomposites photocatalyst was used to degrade azo dye Acid Orange 7 (40 mg/L). The optical decolorization rate was 66.58% after xenon lamp irradiation for 4 h, which is better than that of commercial CeO 2 (43.13%). The results suggested that CeO 2 loading on CNTs not only enhanced the optical decolorization rate but also accelerated the separation of CeO 2 /CNTs and water.

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Section: Xrdmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Preparation, characterization of a ceria loaded carbon nanotubes nanocomposites photocatalyst and degradation of azo dye Acid Orange 7

Wen

Tang

Chen

et al. 2016

Archives of Environmental Protection

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“…负载钒氧化物催化剂上的 CO2 氧化乙苯脱氢反应遵循 Mars-van Krevelen 氧化还原机理, CeO2具有易氧化还原性, 可以很快达到 Ce 4+ /Ce 3+ 平衡, 因此它可以在富氧条件下贮存氧, 而在贫氧条件下释放氧. 23 由于具有优良的储放氧功能, CeO2被广泛用作催化剂的结构助剂和电子助剂以提高催化剂性能, [24][25][26][27] 并且对 CO2 也有良好的活化作用. 28 [31][32][33] Ce 3d5/2 的结合能为 882.2 eV, 归属为 Ce 4 + 物种.…”

Section: 引言unclassified

Effect of Ce Promoter on Catalytic Performance of V/SiO<sub>2</sub> in Oxidative Dehydrogenation of Ethylbenzene with Carbon Dioxide

Hai-Xin¹,

Chen²,

Xing-Yu³

et al. 2014

Acta Physico-Chimica Sinica

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The effect of a Ce promoter on the catalytic properties of V/SiO2 was investigated for the oxidative dehydrogenation of ethylbenzene (EB) to styrene (ST) with CO2 (CO2-ODEB). The catalysts were characterized by nitrogen adsorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), H2 temperature-programmed reduction (H2-TPR), CO2 temperature-programmed desorption (CO2-TPD), and thermogravimetric analyses (TGA). It was found that incorporation of Ce into V/SiO2 increased the dispersion of active V species, enhanced the redox properties of the system, and inhibited deep V reduction of V 5 + to V 3 +. The Ce promoter also improves the basicity of V/SiO2 and CO2 adsorption on the catalyst, and suppresses coke formation. The addition of a Ce promoter greatly improves the catalytic activity and stability of V/SiO2 towards CO2-ODEB. The ST yield and selectivity reach 55.6% and 98.5% , respectively, for CO2-ODEB over the most efficient catalyst, V(0.8)Ce(0.25)/SiO2, at 550°C, and a CO2/EB molar ratio of 20. Moreover, after reaction for 12 h, the V(0.8)Ce(0.25)/SiO2 still shows stable catalytic

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“…Short-MWNTs may be less hazardous than long-MWNTs, recognising that the toxicity of nanotubes increases as a function of increasing length, heightening the propensity for an immune response [13][14][15]. Furthermore, the internal channels of MWNTs have been found to be suitable for containing chemical reactions [16,17] and the use of short-MWNTs should assist with the transport of reactants and products in and out of the nanotubes [18,19]. However, the lack of suitable methods for the controlled growth of short-MWNTs with retained tubular morphology and graphitic structure has encouraged the development of a variety of protocols for the cutting of MWNTs.…”

Section: Introductionmentioning

confidence: 99%

Engineering the physical parameters for continuous synthesis of fullerene peapods

et al. 2016

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Previous efforts to insert fullerenes into a carbon nanotube (CNT) involved the isolated synthesis of CNTs and fullerenes and then annealing CNTs and fullerenes together for encapsulation. We demonstrated the process for the continuous production of fullerene peapods inside the arc instrument by modifying the conventional arc ablation system, which can be repeated to obtain the desired mass scale product. Inside the arc discharge unit, by using the tunable external magnetic field, the double-walled CNTs (DWCNTs) were first synthesized and then directed to deposit onto the water cooled aluminium (Al) plate. The openings were created on DWCNTs by controlled heating of the Al plate and then fullerenes were synthesized and deposited on DWCNTs. In the arc instrument, fullerenes were finally directed to enter into DWCNTs from the defect sites by heating the Al plate in a vacuum. The formation of the peapod was established by the structure-property studies despite the huge deposition of metal catalyst nanoparticles and fullerenes on the surface of the nanotube which were a serious challenge for molecular level characterization of the grown peapod structures.

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Enhanced catalytic performance of CeO2 confined inside carbon nanotubes for dehydrogenation of ethylbenzene in the presence of CO2

Cited by 41 publications

References 59 publications

Preparation, characterization of a ceria loaded carbon nanotubes nanocomposites photocatalyst and degradation of azo dye Acid Orange 7

Preparation, characterization of a ceria loaded carbon nanotubes nanocomposites photocatalyst and degradation of azo dye Acid Orange 7

Effect of Ce Promoter on Catalytic Performance of V/SiO<sub>2</sub> in Oxidative Dehydrogenation of Ethylbenzene with Carbon Dioxide

Engineering the physical parameters for continuous synthesis of fullerene peapods

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