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What are Alumina Supported Catalysts? Alumina Supported Catalysts are composed of an alumina base, and are widely used in hydrotreating, hydrocracking and chemical synthesis. Like other FCC Catalysts, Sieving alumina supported catalysts is a necessary process in order to maximize catalytic efficiency and improve reactor performance. Sieving alumina supported catalysts using conventional vibratory screening machines can be a difficult process due to the fine particle size requirements of the industry and well as the materials tendency to agglomerate. These conventional sieves can struggle to screen below 100um and will result in the screen mesh becoming blinded when attempting to sieve any finer.