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Comparative synthesis of mesoporous MgO-MoO3 catalyst for potential industrial application
Johnson Kwame Efavi,Elvis Tiburu,Abu Yaya,Lois Afua Damptey,Elsie Bowen-Dodoo,Bernard Asimeng,Jianqin Zhuang 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.10
The elevated interest in new materials as porous catalyst supports demands alternative strategies to improve yield of thesesystems through simple synthesis methodologies. In this work, different porous materials of MgO-MoO3/SBA-15 weresynthesised at air, oven and microwave conditions to investigate and identify the best method for producing high surface areaMgO-MoO3/SBA-15 catalyst. The results showed successful synthesis of mesoporous SBA-15 with homogenous dispersion ofMgO-MoO3 nanocatalyst within the SBA-15 framework. The extent of crystallisation, the pore distribution and surface areawas dependent on the crystallisation conditions adopted. The channels of the porous MgO-MoO3/SBA-15 network from theoven dry module were highly ordered, distinct and parallel. The oven drying crystallisation process module also yieldedcatalyst with surface area about ten folds higher than that of the air dry processes indicating that a given process module canbe tailored for specific industrial application. The results also suggest that longer crystallisation time at temperatures in therange of 100 oC favours the formation of uniform pore structure with high surface area.
Investigating triaxial electrical properties of ceramic composites for electroporcelain insulators
A.N.N. Dowuona,A.Yaya,E. Nyankson,J.K. Efavi,L.N.W. Damoah,D. Dodoo-Arhin,V. Apalangya,E. Annan,E.K. Tiburu,B. Onwona-Agyeman,B. Tomiczek 한양대학교 세라믹연구소 2018 Journal of Ceramic Processing Research Vol.19 No.2
Four porcelain composites comprising kaolin (27-37%), beach sand (20-24%), ball clay (13-18%) and feldspar (25-40%), wereformulated and characterized using powder XRD, SEM and particle size distribution analysis in order to determine theirpotential for use as electroporcelain insulators. Chemical, mechanical and electrical properties were also evaluated. Each ofthe formed samples were compressed at 200 MPa and sintered at 1250 oC for 1 hour. Bending strength results of the porcelainbodies showed increase in bending strength with reduction in particle sizes. An increase in dielectric strength was found forsamples with a higher felspar content. The XRD pattern for all the sintered samples showed the presence of quartz and mullitephases in the body at different intensities. Samples with lower particle sizes showed similar electrical and mechanicalproperties to commercially available electroporcelains albeit at a cheaper cost of production.