ABSTRACT
Catalytic reactions are frequently conducted under conditions in which only the outer periphery of the catalyst particle functions actively. This means that the interior is catalytically of little or no value. It also is true that the site of catalytic action, which is in the lower reaches of the pores, is frequently where the objectionable by-products form and unwanted side reactions take place. The coating equipment generally resembles the pill-coating devices available to the pharmaceutical industry. The catalytic ‘paint” can be compounded in much the same way as the slurry that is used in the spherudizers mentioned earlier. One of the major problems with this type of catalytic material is that the coating may peel from the core. It is obvious that much of the processing of coated catalyst is art, and inasmuch as it is art, it will require the typical cut-and-try methods for successful resolution of problems.
