Preparation of Porous Permeable Ceramic Based on Silicon Carbide for Hot Flue Gas Filtration (Review)

Porous SiC and SiC/Cf Ceramic Microspheres Derived from Polyhydromethylsiloxane by Carbothermal Reduction

“…Spectra were acquired in HPDec mode with a 4 µs pulse at 90 • and with a 100 s delay between pulses. 13 C MAS NMR, spectra were recorded using a DSX 400 Bruker spectrometer(Bruker, Billerica, MA, USA). Spectra were acquired in HPDec mode with a 5 µs pulse at 90 • and with a 100 s delay between pulses.…”

“…The obtained results are consistent with the TGA analysi show that only ceramic microspheres were obtained from the aromatic carbon siloxane particles, which are formed when the w/w ratio of DVB to PHMS was above contain a significant amount of the free carbon, Figure 4. The aromatic carbon is visible in the 13 C NMR HPDec/MAS spectra, Figure 5. The spectra show a broad sig sp 2 carbon-centered at about 110 ppm belonging mostly to Cf and a sharp signal at 20 of sp 3 carbon originating mainly from SiC.…”

“…In addition, hierarchical porosity gives the materials a high surface area and facile infiltration of liquids to their pores [ 7 ]. Porous SiC-based microspheres could be used in many fields, such as: catalysis [ 11 , 12 ], hot gas filtration [ 13 ], thermal insulation [ 10 ], sensors [ 14 ], absorbers [ 15 , 16 ], molten metal filtering [ 17 ], membranes [ 18 , 19 ], and tissue engineering [ 20 ]. The interest has recently been focused on SiC composites as potential semiconductor materials for absorption of electromagnetic waves [ 21 ], anodes of lithium-ion batteries [ 22 ] and supercapacitors [ 23 ].…”