Heat transfer solids for high temperature fluidized bed reactions.

摘要

Heat transfer solids are formed, suitably from particulate refractory inorganic solids, notably alumina, which contains as impurities up to about 0.5 wt% silicon and/or up to about 500 wppm boron, by treating with an acid, or dilute acid solution sufficient to reduce the concentration of silicon and boron in the outer peripheral surface layer of the particles to no greater than about 5 atom % silicon and boron. High surface purity particles with reduced sintering and agglomeration characteristics are obtained.