COMPOSITION BASED ON ZIRCONIUM OXIDE, CERIUM, NIOBIUM AND TIN, PROCESS FOR PREPARATION AND USE IN CATALYSIS

摘要

The composition of the invention is based on oxides of zirconium, cerium, niobium and tin in proportions by mass of oxide of between 5% and 50% for cerium oxide, 5% and 20% by weight. % for niobium oxide, 1% and 10% for tin oxide and zirconium oxide supplement. The composition can be used in a catalytic system for a process for treating a gas containing nitrogen oxides (NOx) of the SCR type.