Please login first
Mechanochemical activation of CeO2 in order to boost physicochemical properties for catalytic applications
* , ,
1  Instituto de Investigaciones en Tecnología Química (INTEQUI-CONICET), Universidad Nacional de San Luis (UNSL), Facultad de Química Bioquímica y Farmacia, Almirante Brown 1455, Capital, 5700 San Luis, Argentina
Academic Editor: Manoj Gupta


Mechanochemical activation, by means of high-energy ball milling, was applied to CeO2 as a strategy to enhance its physicochemical properties. Different milling parameters such as rotational speed and milling time were screened to evaluate their effect on ceria. Fluorite-type structure of cerianite was maintained in all cases, no matter the amount of energy introduced by milling process, as observed by X-ray Diffraction (XRD). A decrease in crystallite sizes along with a consequent increase in Specific Surface Area (SBET) were observed by XRD and N2 sorption (BET method). Pore diameters and total pore volumes were also in line with the duration of CeO2 milling. Moreover, redox properties and oxygen mobility studied by H2-Temperature Programmed Reduction (H2- TPR) showed an increase in reducibility with milling time, including signals of both bulf and surface ceria, due to the greater number of defects and/or oxygen vacancies achieved by mechanochemical activation. Obtained features could play an essential role in terms of metal-support interaction, reactants adsorption and/or oxygen supply during catalytic reactions. Thus, high-energy ball milling becomes a useful, simple and green method for materials design with catalytic applications.

Keywords: Cerium oxide; High-energy ball milling; Physicochemical properties; Redox features; Materials design
Comments on this paper
Samy Anwar
Good job and interesting topic.

Phaliphise Lisissis
Our main worry as we transition to a more sustainable civilization that uses fewer fossil fuels like coal and crude oil is the selective activation of tiny molecules like CO, CO2, CH3OH, and CH4. A comprehensive comprehension of the reactivity of these tiny compounds, encompassing the generation of reactive intermediates and possible deactivation products, is necessary for their catalytic chemistry. Thus, more development of analytical techniques is required.