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Perovskite-type compounds for use in lean NOx traps

A technology of traps and mixtures, applied in chemical/physical processes, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc.

Inactive Publication Date: 2010-09-22
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Therefore, the depletion of NO x The trap is integrated into the engine aftertreatment system of a lean-burn engine to remove NO from the engine exhaust x Attractive, but challenging option for unwanted emissions of gases

Method used

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  • Perovskite-type compounds for use in lean NOx traps
  • Perovskite-type compounds for use in lean NOx traps
  • Perovskite-type compounds for use in lean NOx traps

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Embodiment

[0070] Specific exemplary embodiments of catalyst materials include CeO 2 -ZrO 2 Carrier, which is loaded with La 0.9 Sr 0.1 MnO 3 as NO x Oxidation catalyst, BaO as NO x Storage catalyst, rhodium as NO x reduction catalyst, and palladium.

[0071] A certain amount of La was prepared by the citric acid method 0.9 Sr 0.1 MnO 3 . First, an appropriate amount of La(NO 3 ) 3 ·6H 2 O, 50% Mn(NO 3 ) 2 solution and Sr(NO 3 ) 2 Dissolve in distilled water with citric acid monohydrate. Then, citric acid was added to this solution in excess of 10 wt% to ensure complete complexation of the metal ions. The solution was stirred at room temperature for 1 hour. Next, the solution was heated to 80 °C under continuous stirring to slowly evaporate the water until the solution turned into a viscous gel and NO / NO began to precipitate 2 gas so far. The gel was then left overnight in an oven set at 90°C. The resulting sponge-like material was crushed and calcined at 700 °C in ...

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Abstract

An exhaust aftertreatment system for a lean-burn engine may include a lean NOx trap that comprises a catalyst material. The catalyst material may remove NOx gases from the engine-out exhaust emitted from the lean-burn engine. The catalyst material may include a NOx oxidation catalyst that comprises a perovskite compound.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Application No. 61 / 160523, filed March 16, 2009, the disclosure of which is hereby incorporated by reference in its entirety. technical field [0003] The technical field of the invention relates generally to exhaust aftertreatment systems (exhaust aftertreatment system), and more particularly to x Catalyst material in the trap. Background technique [0004] Lean-burn engines can be supplied with a lean mixture of air and fuel (an oxygen-rich mixture) as a means of improving the fuel economy of the vehicle. Engine exhaust from such an engine during lean-burn operation may include relatively high levels of oxygen (O 2 ), relatively low levels of carbon monoxide (CO) and unburned / partially burned hydrocarbons (hereafter denoted as HC), and a small amount mainly containing NO and NO 2 (collectively referred to as NO x gas) nitrogen oxides. However, the concentrati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/94B01D53/56B01J23/63B01J23/89
CPCB01J23/6562B01D2255/20715B01D2258/014B01D2255/2092B01D2255/2022B01J23/002B01D2255/2073B01D2258/012B01D2255/1025B01D2255/2063B01D2255/91B01D2255/20746B01D2255/20753B01D2255/1023B01D2255/407B01D2255/2042B01D53/9422B01D2255/1021B01D2255/2045B01J37/10B01D2255/50B01J23/63B01J37/0248B01D2255/20738B01D2255/20761B01J2523/00B01J2523/24B01J2523/25B01J2523/3706B01J2523/3712B01J2523/48B01J2523/72B01J2523/822B01J2523/824
Inventor W·李C·H·金G·齐
Owner GM GLOBAL TECH OPERATIONS LLC