Construction of Mesoporous Ce0.5Zr0.5O2 from Different Gemini and Cetyltrimethylammonium Bromide Surfactants
This paper reports the preparation of mesoporous Ce0.5Zr0.5O2 solid solutions (M-CZ) using three Gemini surfactants and CTAB as the co-templates. Ordered mesoporous CZ co-templated by CTAB and G2 were prepared in a carefully controlled experiment. Samples were characterized by X-ray diffraction (XRD), high resolution transmission electronic microscopy (HRTEM), N2 adsorption–desorption isotherms, temperature-programmed H2 reduction (TPR), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). Based on the N2-isotherm results, the relationship between preparation parameters and pore structures are discussed. It was found that several synthetic parameters, such as the types of and ratios of surfactant, the existence of a co-template, hydrothermal treatment duration time, as well as thermal treatment temperatures obviously affected pore structures and properties of the products. The maximum specific surface area obtained was 179 m2 · g–1. A mechanism was proposed to explain the correlation between the surfactants and inorganic species. Meso-pores within crystalline frameworks were found to be composed of intra-particle spaces, and the pore sizes obviously correlated with the length of the hydrocarbon chains. H2-TPR curve of the sample templated by CTAB showed a reduction peak at 708 °C, while samples co-templated by Gemini plus CTAB showed obvious decreases in reduction temperatures.
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Document Type: Research Article
Publication date: February 1, 2015
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