High-energy ball milling of Al2O3–TiO2 powders

Coste, Sandrine; Bertrand, Ghislaine; Coddet, Christian; Gaffet, Éric; Hahn, Horst; Sieger, H.

doi:10.1016/j.jallcom.2006.08.117

Cited by 26 publications

(6 citation statements)

References 9 publications

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“…The impact induced from the milling actions is regarded as the main reason for high pressure TiO 2 -II synthesized during milling. [11][12][13] This result is consistent with the phase diagram shown in Fig. 2 where the anatase and TiO 2 -II phases change into rutile under high pressures and temperatures.…”

Section: Milling Effect On Phase Transformationsupporting

confidence: 89%

Effect of Milling on the Carbothermal Reduction of Oxide Mixture for (Ti,W)C-Ni

Kwon

Kang

2008

Mater. Trans.

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The effect of high-energy milling on the phase transformation and carbothermal reduction was examined using an oxide mixture, TiO 2 -WO 3 -NiO-C, with a process to synthesize (Ti,W)C cermets. Due to the high energy involved in the mill raw, anatase TiO 2 transformed first to TiO 2 -II and then to rutile, while WO 3 transformed to a high-pressure WO 3 -HP and hexagonal WO 3 phase. The co-existence of WO 3 and TiO 2 enhanced the formation of a nano-crystalline or amorphous phase. The (Ti,W)C phase was formed mainly at 1150 C from TiC and WC formed in the early stages. These results were further examined using XRD, the Rietveld method and mass spectroscopy.

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Section: Milling Effect On Phase Transformationsupporting

confidence: 89%

Effect of Milling on the Carbothermal Reduction of Oxide Mixture for (Ti,W)C-Ni

Kwon

Kang

2008

Mater. Trans.

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“…This observation inspires us to further investigate their effects on the physicochemical properties of catalysts in detail. (Coste et al 2007). In particular, the diffraction peak intensity of rutile TiO 2 rstly decreases with the increase of milling time (0.5 h ~ 1.5 h), disappeares at 2 h, then reappeares at 3h, and increases with prolonging the ball milling time.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

PCDD/F removal at low temperatures over vanadium-based catalyst: insight into the superiority of mechanochemical method

Tang

et al. 2021

Environ Sci Pollut Res

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The high toxicity and low volatility of PCDD/Fs prevent detailed study of their catalytic degradation removal characteristics. In this study, rstly, 1,2-dichlorobenzene (1,2-DCBz) was initially used as a model to investigate the catalytic characteristics of various vanadium-based catalysts prepared by different methods. Then, the optimized catalyst was used for catalytic degradation of real PCDD/Fs at lowtemperatures based on a self-made stable source. The VO x /TiO 2 catalysts synthesized by the mechanochemical method (VTi-MC2) had a higher 1,2-DCBz removal e ciency (> 85%) and stability (> 420 min) at low temperatures (< 200 o C) compared to VTi-SG (sol-gol method) and VTi-WI (wetness impregnation method). The physico-chemical properties of catalysts were studied using comprehensive characterization. It was found that the VTi-MC2 has better VO x species distribution and possesses the highest V 5+ species and surface adsorbed oxygen content, which are the key factors contributed to the higher removal e ciency. Accordingly, the mechanochemical method can be used to control the physicochemical properties of catalyst by adjusting the milling parameters. The optimum ball-milling time is 2 h and the suitable precursor is NH 4 VO 3 for VO x /TiO 2 . Moreover, the removal e ciency of gas phase PCDD/Fs catalyzed by VTi-MC2 is 97% within a temperature range below 200 ℃, and the catalytic degradation of PCDD/Fs surges to 50%, which is higher than those reported research. In general, the mechanochemical strategy reported provides a means for seeking more e cient catalysts used for lowtemperature degradation of various trace organic pollutants.

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“…The selectivity of DME and FA is low since the reaction temperature is as low as 373 K and is unfavorable for the formation of DME and FA [7]. It is acknowledged that the support prepared via the ball-milling method and the solgel method could promote the dispersion of active species and decrease the average particle size of catalyst, which is beneficial for increasing the catalytic activity [28,29]. Additionally, both methods strengthen the mutual function between TiO 2 and Al 2 O 3 , increasing weaker acid sites by incorporating TiO 2 into Al 2 O 3 and improving the redox capability of vanadates by producing more oxygen vacancies [24].…”

Section: Redox Propertiesmentioning

confidence: 99%