The porous spinel ceramics were prepared from magnesite and bauxite by the pore-forming in situ technique. The characterization of porous spinel ceramics was determined by X-ray diffractometer (XRD), scanning electron microscopy(SEM), mercury porosimetry measurement etc and the effects of particle size on microstructure and strength were investigated. It was found that particle size affects strongly on the microstructure and strength. With decreasing particle size, the pore size distribution occurs from multi-peak mode to bi-peak mode, and lastly to mono-peak mode; the porosity decreases but strength increases. The most apposite mode is the specimens from the grinded powder with a particle size of 6.53 𝜇m, which has a high apparent porosity (40%), a high compressive strength (75.6MPa), a small average pore size (2.53 𝜇m) and a homogeneous pore size distribution.

The preparation of titanium dioxide fibres with high specific surface area as a catalyst carrier is of great significance for the subsequent development of TiO$_2$ fibres in the field of electrocatalysis. In this article, the electrospinning technology combined with sol–gel method was adopted to manufacture mesoporous TiO$_2$ fibres using tetrabutyl titanate as the titanium source, polyethylene pyriolanone as the polymer template and ethanol as the solvent. By means of cold field-emission scanning electron microscopy, transmission electron microscopy, desktop electron microscope (TM3030), energy dispersive X-ray spectroscopy, thermal analyzer, X-ray diffraction, X-ray photoelectron spectroscopy, porometer 3G specific surface area and pore size analyzer, the morphology characterization of TiO$_2$ fibre under different conditions was analysed and the optimal preparation parameters of mesoporous TiO$_2$ fibres was proposed.