Catalysts possessing an improved resistance to poisoning

摘要

Disclosed are catalyst compositions comprising; (i) vanadium compounds or metal, (ii) tungsten compounds or metal, (iii) titanium compounds or metal, and (iv) at least one other additional compound selected from molybdenum, cobalt or niobium compounds or metal. The catalyst compositions are useful in emission control associated with the combustion of one or more types of fossil fuel, such as NOx removal in selective catalytic reduction (SCR) processes, and possess an improved resistance to at least one type of poisoning, such as phosphorus poisoning.