Redox-stable Perovskite for Storage of Nitrogen Oxides from Offgases

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This invention introduces a new class of redox-stable perovskite materials designed for the storage of nitrogen oxides (NOx) from exhaust gases, especially from combustion processes in engines and industrial plants. The formulated perovskites, deposited on inert porous carriers, offer improved NOx storage, enhanced resistance to catalyst poisons like sulfur compounds, and stable operation at the typical temperatures found in exhaust treatment systems. These materials can be used in NOx traps, hybrid catalysts, and similar devices to reduce harmful emissions more efficiently and with longer service life.

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• NOx storage systems for automotive exhaust aftertreatment (e.g., lean NOx traps in cars and trucks).
• Industrial exhaust purification for power plants, chemical processing units, and turbines.
• NOx emission control in marine and railway diesel engines.
• Catalyst systems in selective catalytic reduction (SCR) and hybrid LNT/SCR configurations.
• Emission control in stationary combustion installations, like heating or incineration plants.

BenefitsContent extracted from patent full text and abstract with AI.

• Greater resistance to sulfur and other catalyst poisons, reducing degradation and extending operational lifespan.
• Maintains high NOx storage efficiency across a broad temperature range (200–500°C), matching real-world exhaust conditions.
• Minimizes fuel consumption during catalyst regeneration, thanks to redox stability and reduced oxygen release.
• Reduces or eliminates the need for high-temperature desulfation treatments, simplifying maintenance.
• The use of iron-based perovskite materials can lower reliance on expensive precious metals, potentially reducing costs.
• Improved flexibility for integration into existing ceramic or metallic support structures and catalyst designs.

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Patent Abstract

The invention relates to the use of a perovskite of the general formula (I) or (II) A1-xA'xB1-xB'xO3 (I) A1-xA'xB1-x/2B'xO3 (II), as NOx storage means, especially for storing nitrogen oxides from offgases, and to oxide ceramic materials comprising the perovskites of the formula (I) or (II) and an inert porous carrier material, to NOx storage means and catalysts comprising them, and to processes for producing them and to selected novel perovskites.