Ordered mesoporous carbons with body centred cubic pore structure. (July 2021) - Sakina, F.
Highlights: Carbons with highly ordered body centred cubic arrangement of mesopores prepared. Alternative, halide and metal-free catalysts used. Carbons characterised using diffraction, electron imaging and physisorption methods. High quality electron images and diffractograms of the mesopore structure obtained. Systematic study of influence of preparation parameters on texture and structure. Abstract: The preparation of mesoporous carbons possessing a highly ordered body centred cubic (bcc) arrangement of pores by employing a halide- and metal-free synthesis method is reported. Products were characterised using gas physisorption, Small Angle X-ray Diffraction and X-ray Scattering, Raman spectroscopy and High Resolution Transmission Electron Microscopy (TEM). The materials produced in this work had Specific Surface Areas of between 422 and 988 m 2 g −1 and pore diameters of around 7 nm. From the TEM images, high quality Digital Diffraction Patterns, relating to the ordered mesopore structure, were obtained. On increasing calcination temperature from 350 to 1000°C the bcc structure was retained but its dimensions decreased progressively as the mesopore structure shrank. The effects on the structure and texture of the materials of the three key parameters of polymerisation time and the concentrations of the two catalysts employed, NH4 OH and oxalic acid, were studied. Shorter polymerisation times and lower catalyst concentrations gave rise to the most well-ordered products whereas longer polymerisation times with higher concentrations of base and acid catalyst resulted in disordered pore structures. Graphical abstract: Image, graphical abstract