Evaluation of SiC-porcelain ceramics as the material for monolithic catalyst supports

Abstract

Mechanical and thermal properties of SiC-porcelain ceramics were studied in the wide SiC content range of 0-95%. Microstructure evolution, shrinkage at sintering, porosity, mechanical strength, elastic modulus, coefficient of thermal expansion (CTE) and thermal conductivity were studied depending on SiC content. The optimal sintering temperature was 1200 ℃, and the maximum mechanical strength corresponded to SiC content of 90%. Parametric evaluation of the ceramic thermal shock resistance revealed its great potential for thermal cycling applications. It was demonstrated that the open-cell foam catalyst supports can be manufactured from SiC-porcelain ceramics by the polyurethane foam replication process.

Effect of Calcination Temperature on NO–CO Decomposition by Pd Catalyst Nanoparticles Supported on Alumina Nanofibers

“…These media correspond to the amorphous form of Al2O3 with Pd particle sizes of about 5 nm. Similar results were reported by Chambers et al when the NO-CO reaction was carried out using the Pt group catalysts [21]. Granger et al also indicated that nitrous oxide (N2O) was an intermediated product in a NO-CO reaction [52].…”

“…Figure 9A,B show that all the nitrogen oxide and carbon monoxide were decomposed to nitrogen, nitrous oxide, and carbon dioxide gases at a 350 • C reaction temperature for media calcined at 650 • C and 750 • C. These media correspond to the amorphous form of Al 2 O 3 with Pd particle sizes of about 5 nm. Similar results were reported by Chambers et al when the NO-CO reaction was carried out using the Pt group catalysts [21]. Granger et al also indicated that nitrous oxide (N 2 O) was an intermediated product in a NO-CO reaction [52].…”

“…These small particles are often supported on an inert substrate for ease of handling and to immobilize the particles, preventing them from moving with the gas or liquid flow streams. A number of materials are used as the monolithic catalyst supports [21][22][23][24]. Recent attention has turned to the use of submicron fibers as catalyst support due to their high surface area, flexibility, and flow-through pore structures that make it easy for the reactants to reach the catalyst particles [24][25][26][27][28][29][30][31][32][33][34].…”

Adsorption effect of Zn+2 and Co+2 on the antibacterial properties of SiC‐porcelain ceramics

“…The expected increase of bulk density due to secondary crystallization mullite from liquid melt is compensated by the increase of residual porosity. 5,16 Flexural strength of porcelain without SiC addition was found to be ~44 MPa and it reached a value of ~58 MPa at the level of 15 wt% SiC addition. The observed values are very close to previously reported data.…”

“…4 Previously, the effect of SiC on mechanical and thermal properties of porcelain had been studied by researchers. 5 However, no comprehensive report is available till date to demonstrate a method by which SiC added porcelain can be made antibacterial.…”