Catalyst for purifying exhaust gas

Abstract

Abstract PURPOSE:To enable decomposition of NOx contained in large excess oxygen without using a conventional reducing agent by providing an NOx decomposition catalyst shown in the specified crystalline structural formula in the passage of exhaust gas of an automobile equipped with an internal combustion engine. CONSTITUTION:An NOx decomposition catalyst having a crystal structure shown in the formula I (A shows alkaline earth metal such as Ba and Sr, B shows rare earth metal such as Y, Nd and La, C shows metal of copper group such as Cu and Ag, 0<=x<=3.0, 0<=y<=2.0, 0<=z<=4.0, 4.0<=alpha<=8.0, 0<=beta<=2.0) is formed. A catalyst for purifying exhaust gas is constituted by providing this NOx decomposition catalyst 3 in the passage of exhaust gas of an automobile equipped with an internal combustion engine 1. By this catalyst constitution, NOx of ppm order contained even in large excess oxygen such as about 10% can be decomposed.

Inventors

• 👤 Kenji Tabata
• 👤 Ikuo Matsumoto

Bibliographic Details