Nitrogen oxide storage material and nitrogen oxide storing catalyst prepared therefrom

US6350421B1 · kind B1 · utility

Assignee

• DMC, INC · DE

Inventors

• Wolfgang Strehlau · Großkrotzenburg, DE
• Ulrich Göbel · Hattersheim, DE
• Lothar Mussmann · Offenbach, DE
• Rainer Domesle · Alzenau, DE

Key dates

• Filing date: Aug 23, 1999
• Grant date: Feb 26, 2002
• Expiry date: Aug 23, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S502/514
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A nitrogen oxide storage material is disclosed which contains at least one storage component for nitrogen oxides in the form of an oxide, mixed oxide, carbonate or hydroxide of the alkaline earth metals magnesium, calcium, strontium and barium and the alkali metals potassium and caesium on a high surface area support material. The support material can be doped cerium oxide, cerium/zirconium mixed oxide, calcium titanate, strontium titanate, barium titanate, barium stannate, barium zirconate, magnesium oxide, lanthanum oxide, praseodymium oxide, samarium oxide, neodymium oxide, yttrium oxide, zirconium silicate, yttrium barium cuprate, lead titanate, tin titanate, bismuth titanate, lanthanum cobaltate, lanthanum manganate and barium cuprate or mixtures thereof.