METHOD FOR PRODUCING NOX ADSORBING MATERIAL AND NOX ADSORBING MATERIAL

摘要

A zeolite is impregnated with an aqueous iron chloride solution, and then the resulting is heated at 500-700°C in an atmosphere containing no water, thereby performing ion exchange of Fe. By heating at a high temperature in an atmosphere containing no water, there can be produced a NOx adsorbing material which exhibits high NOx adsorption performance even after a hydrothermal durability test.