Catalyst for the oxidation of co and hc at low temperatures

Patent metadata

Field	Value
Publication number	US-2016236180-A1
Application number	US-201415029853-A
Country	US
Kind code	A1
Filing date	Oct 22, 2014
Priority date	Oct 22, 2013
Publication date	Aug 18, 2016
Grant date	—

Abstract

The present invention relates to a catalyst for the removal of carbon monoxide and hydrocarbon from the exhaust gas of lean-operated internal combustion engines on a supporting body, which bears platinum and/or palladium on one or more refractory carrier materials and also contains cerium oxide and which, after reductive treatment at 250° C. and after CO adsorption, is characterized by certain peaks in Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS), and also relates to the use thereof for removing carbon monoxide and hydrocarbon from the exhaust gas of lean-operated internal combustion engines.

First claim

1 . A catalyst for the removal of carbon monoxide and hydrocarbon from the exhaust gas of lean-operated internal combustion engines on a supporting body, which
(i) bears platinum or palladium on one or more refractory carrier materials, and (ii) also contains cerium oxide, characterized in that, after reductive treatment at 250° C. and after CO adsorption, it shows peaks at wavenumbers 2906 cm −1 (±5 cm −1 ), 2879 cm −1 (±5 cm −1 ), and 2847 cm −1 (±5 cm −1 ) in Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) and wherein the ratio of the peak heights at 2879 cm −1 and 2906 cm −1 and the peak heights at wavenumbers 2847 cm −1 and 2906 cm −1 are each greater than 0.4.

2 . The catalyst according to claim 1 , characterized in that the quantity of platinum or platinum and palladium is 0.5 to 10% by weight relative to component (i).

3 . The catalyst according to claim 1 , characterized in that the quantity of platinum or platinum and palladium is 1 to 5% by weight relative to component (i).

4 . The catalyst according to claim 1 , characterized in that it comprises platinum and palladium, and the weight ratio of Pt:Pd is 1:1 to 20:1.

5 . The catalyst according to claim 1 , characterized in that aluminum oxide, silicon oxide, magnesium oxide, titanium oxide, cerium oxide, zeolite, or mixtures or mixed oxides thereof are used as refractory substrate materials of component (i).

6 . The catalyst according to claim 1 , characterized in that cerium oxide is present in amounts of 50 to 150 g/L relative to the volume of the supporting body.

7 . A method for the removal of carbon monoxide and hydrocarbon from the exhaust gas of lean-operated internal combustion engines, characterized in that the exhaust gas is passed over a catalyst according to claim 1 .

Assignees

• Umicore Ag & Co Kg

Inventors

• Hoyer Ruediger
• Wen Fei
• Mueller Elena

Classifications

• B01D2255/1023

  Palladium · CPC title

• B01J23/10

  of rare earths · CPC title

• B01D53/945

  characterised by a specific catalyst · CPC title

• B01D2255/1021

  Platinum · CPC title

• B01D2255/40

  Mixed oxides · CPC title