Support bayerite

Taira and Kuroda have shown that the addition of bayerite accelerates the reaction of Raney alloy with water and, by developing the alloy with addition of bayerite, prepared an active Raney Ni that was supported on bayerite and resistant to deactivation.57 The presence of bayerite probably promotes the crystallization of initially... 

AI2O3 is customarily obtained by calcination of boehmite, bayerite, Y-AI2O3, or TI-AI2O3 at temperatures above 650—800 °C, and its formation is associated with a decrease of the surface area to 70—120 m or less. Apphcations of 0-AI2O3 as a catalyst support are mainly motivated by its stabihty at high temperatures (500—800 °C) namely, it retains a medium-to-high surface area of about 100 in g. ... 

All solid supports prepared showed after drying at 100°C, the bayerite structure, independently of the ZrO or TiO concentration. 

The thermal decomposition of gibbsite was chosen to illustrate the application of modem instrumental and computing techniques to preparative controlled reaction rate methods for making reproducible catalysts or catalyst supports of high surface area at atmospheric pressure. Gibbsite is one form of aluminium trihydroxide, Al(OH)3, the other being the mineral bayerite [6]. The thermal decomposition of gibbsite is complex, and is influenced both by crystallite size and water vapour pressure. Two processes, which may overly under certain conditions, have been identified [7] ... 

Increasing the attrition lesistance of the few fluid-bed catalysts brings to an appreciable reduction of catalyst costs due to a decreased consumption. High surface area alumina in its various forms (boehmite, bayerite, gamma, delta) and silica-alnmina are the preferred supports for fluid bed catalysts. However in mai cases their attrition resistance is not satisfactory, like, for instance, in the case of pure and silica containing boehmites. A remarkable improvement of the attrition resistance of these supports can be obtained by fluorination withHF (Table 1). 

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