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New samples of Co(II)-ZSM-5 zeolites were prepared, and Co-containing ZSM-5 and erionite were studied via diffuse reflectant spectroscopy after being dehydrated at 350 and 500{degrees}C and after adsorption of carbon monoxide, water, and ethylene. In general, Co-ZSM-5 contains three different Co sites. However, Co-ZSM-5 prepared at acidic conditions contained only two different sites. One of these sites is probably identical with the Co site in Co-erionite. After dehydration at 500{degrees}C, Co siting in these zeolites was changed. In erionite at this same condition, Co ions were located in the plane of the single regular six-ring. Only strong ligands such as water could be adsorbed on Co ions in ZSM-5 zeolite dehydrated at 350{degrees}C, but Co ions in zeolites dehydrated at 500{degrees}C were also affected by weak ligands. Adsorption studies with NO are underway, and catalytic testing for NO decomposition and reduction over Co-containing zeolites will be carried out during the next quarter

NO decomposition in non-reducing atmospheres. Technical progress report, September 1995--November 1995