polycrystalline mfi zeolite membranes were prepared on α-alumina tubular support by hydrothermal treatments at 413 k. the synthesized zeolite membranes were characterized by xrd, sem and single gas permeation. the influence of hydrothermal treatment steps and the calcination time on the zeolite layer formation were investigated. mfi zeolite membrane prepared by four subsequent hydrothermal trea...

Alum salts are commonly used as coagulants in the purification of surface water for potable supplies. The resultant waste alumina-rich sludge is currently landfilled UK. This study aimed to valorise by using heat-treated alum an additive cement. was calcined at 475–1100 °C and then characterized correlate physical mineralogical changes with cementitious activity engineering performance. 825 tra...

Abstract Porous mullite ceramics were prepared from mixtures of Egyptian kaolinite-clay and calcined α-alumina powder. The effects two methods compaction as well types binder investigated. influence sintering temperature on the physical properties, crystalline phase, compressive strength microstructure was studied. Mullite bodies processed by uniaxial pressing utilizing 15wt. % water at 1500°C ...

highly sinterable alumina nano-powders have been synthesized by a sol-gel combustion method with glycine asfuel. the preparation involved the thermal decomposition of a chelating agent (fuel)-nitrate gel and theformation of amorphous precursors. the nanopowders calcined at 1100°c were characterized by x-ray powderdiffraction (xrd) and scanning electron microscopy (sem). it was found that the ch...

Macro-mesoporous alumina, calcined at different temperatures (from 400 to 800 °C), were tested in dry reforming of methane reaction under plasma discharge a fixed deposited power (P = 8 W) with ratio CO2/CH4 2. Besides alumina materials, the one possessing lowest surface area (72 m2 g?1) exhibited highest activity: Methane conversion reaches 31.3 % against 23.4, 22.6 and 26.8 for 400, 600 °C, r...

The serious morbidity and mortality from silicosis among china biscuit-ware placers and oddmen and china biscuit warehouse workers, when flint was the placing medium for the biscuit firing, have been fully recorded by Arlidge (1892), Sutherland and Bryson (1926), Middleton (1936), and Meiklejohn (1947 and 1949). So alarming was the hazard that ceramic chemists and practical potters urgently str...

Sol-gel method was applied to synthesize ultrafine nano α-alumina particles using aqueous solutions of aluminum isopropoxide and 0.5 M aluminum nitrate hydrate. Sodium dodecylbenzen suffocate and Sodium bis-2ethylhexyl sulfosuccinate were also used as surfactant stabilizing agents. The prepared solution was stirred for 48 hours at 60°C, then, the resultant gelled mass was dried at 90°C, and fin...

Fine reactive alumina powders have a significant impact on the properties of refractories at high temperatures. Except for hydration cement and in situ reactions, performance castables is also correlated with sintering alumina. The characteristics fine produced by various manufacturers are quite different. This work aims to investigate comprehensive influence powder behaviour powders. Three typ...