Permeability and Nanoparticle Filtration Assessment of Cordierite-Bonded Porous SiC Ceramics

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• 作者：Atanu Dey ; Nijhuma Kayal ; Omprakash Chakrabarti ; Rafael F. Caldato ; Caio M. André ; Murilo D. M. Innocentini
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：December 26, 2013
• 年：2013
• 卷：52
• 期：51
• 页码：18362-18372
• 全文大小：576K
• ISSN：1520-5045

文摘

Cordierite bonded porous SiC ceramics having pore fractions (蔚) between 0.33 and 0.72 and pore sizes of 6鈥?0 渭m, flexural strength of 5鈥?4 MPa, and elastic modulus of 6鈥?2 GPa were prepared by oxide bonding at 1350 掳C in air compacts of SiC, Al₂O₃ and MgO powders with petroleum coke (PC) as the sacrificial pore former. To test the applicability of the porous ceramics in the fluid flow field, air permeation behavior was studied with fluid superficial velocity from 0.083 to 0.90 m s^鈥? and at 26鈥?50 掳C. The Darcian, k₁, and the non-Darcian, k₂, permeability coefficients were evaluated by fitting Forchheimer鈥檚 equation to the experimental results. The temperature dependence of the permeability coefficients was explained from structural changes occurring during test conditions. The collection efficiency of filter ceramics (蔚 = 0.62鈥?.68) operating on removal of nanosized aerosol particles with sizes varying from 7 to 300 nm was determined by counting particles before and after filtration at a fluid superficial velocity of 0.1 m s^鈥?. Experimental results showed variation of collection efficiency from 96.7 to 99.9%. The size-selective fractional collection efficiency at different porosity levels was derived by using the well-known single-collector efficiency model considering some boundary conditions, and the model data were validated with experimental results. The test results were used for examination of the applicability of the filter ceramics in nanoparticle filtration processes.