ZEOLITE, HONEYCOMB CATALYST AND EXHAUST PURIFICATION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a zeolite that is excellent in NOx purification performance, particularly excellent in NOx purification performance in a high temperature range of exhaust.SOLUTION: A zeolite has a CHA structure, wherein the composition ratio: SiO/AlOis less than 15, and the content of K (potassium) in the zeolite is 0.1-1 mass% in terms of KO.SELECTED DRAWING: Figure 9