Platinum Metals Rev., 1989, 33, (1), 12
Surface Area of Catalyst Gauzes
The surface restructuring and metal removal that results from catalytic etching of platinum alloy gauzes used for ammonia oxidation, or hydrogen cyanide production by the Andrussow process has been investigated on many occasions. However, no quantitative data has been published about the surface area changes that result.
This has now been remedied with the publication of a paper describing a cyclic voltammetric technique which enables many of the features associated with catalytic etching to be studied, and the surface area of platinum alloy gauzes to be measured accurately (“Catalytic Etching of Platinum Alloy Gauzes”, D. R. Anderson, J. Catal., 1988, 113, (2), 475–489). Results presented show that the top gauze in a catalyst pack has the highest surface area, and the gauze surface areas decrease progressively through the pack. Values of 250 cm2/g and 35 cm2/g are quoted for the top and bottom gauzes, respectively, based upon the weight of a new gauze having a geometric area of 25 cm2/g.