Drying supported catalyst technologies

In the early 1960 s Engelhard developed and commercialized the Selectoxo catalyst and process for H2 plants. The heart of this technology is a highly selective catalyst, which oxidizes up to 10,000 ppm CO without significantly oxidizing the 70% H2 (dry) in the feed stream. CO levels were reduced to less than 5 ppm under steady state conditions (50°C, 10,000 h 1 space velocity and 200-400 psig). The Selectoxo catalyst contains 0.5% platinum (Pt) supported on y -alumina, /8 inch tablets promoted with a base metal oxide. 

The immobilization of the catalyst xerogel in a porous support was performed with a-Al203 foams with open structure provided by the Mendeleev University of Chemical Technology of Russia, Moscow. The aliunina foam was dipped in the sol-gel solution immediately after introduction of the aqueous ammonia. The impregnated a-alumina foams were removed fi"om the gel after aging and vacuum drying. The excess gel was used to prepare a reference sample. 

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