Activated alumina has much micro-paths, so the specific surface is large. It can be used asabsorbent desiccant and catalyst. Introduction:Activated alumina has much micro-paths, so the specific surface is large. It can be used asabsorbent desiccant and catalyst carrier. It is also a kind of trace water desiccant and the pole-molecular absorbent, according to the absorbed molecular polarization, ...