Abstract
The driving force for the development of non-platinum exhaust emission catalysts is the price, strategic importance, and low availability of the platinum group metals. Development work on alternative catalytic materials can either be directed toward finding a material that completely replaces platinum group catalysts or toward finding compounds that allow a reduction in the amount of precious metals needed in each catalyst. Catalyst materials were prepared by the coprecipitation method. The appropriate quantities of copper and chromium nitrates were dissolved and homogenized in a vigorously stirred solution of tin chloride in triply distilled water.