CATALYST COMPRISING Mn SUPPORTED ON A CuO-Al2O3 MIXED OXIDE FOR TREATING EXHAUST GAS STREAM CONTAINING ONE OR MORE OF FORMALDEHYDE, NITROGEN OXIDE

By loading Mn on CuO-Al2O3 mixed oxide and combining Pt and Pd to form a catalyst with a multi-layer coating structure, the existing catalysts are solved, and the problems of instability and poor sulfur resistance at high temperatures are achieved, and formaldehyde, nitric oxide and hydrocarbons in the exhaust gas of diesel vehicles are efficiently oxidized, which reduces the amount of platinum group metals, meets strict emission standards and reduces costs.

CN120359078APending Publication Date: 2025-07-22BASF CORPORATON
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Patent Information

Application Number
CN202380084860.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2022-12-02
Filing Date
2023-12-04
Publication Date
2025-07-22

AI Technical Summary

Technical Problem

The existing catalysts are unstable at high temperatures, making it difficult to effectively oxidize formaldehyde, nitric oxide and hydrocarbons in diesel vehicle exhaust gases, and have poor sulfur resistance, which cannot meet strict emission standards. At the same time, the use of platinum group metals is high and the cost is high.

Method used

A Mn catalyst supported on CuO-Al2O3 mixed oxide is used to combine Pt and Pd metals to form a multi-layer coating structure, and the layered arrangement of the catalyst is optimized to enhance catalytic performance and reduce the amount of platinum group metals.

Benefits of technology

It improves the stability of the catalyst at high temperature and the performance of the sulfurized environment, reduces the amount of platinum group metals, meets strict emission standards and reduces costs, and improves the fuel combustion function and soot oxidation efficiency.

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Abstract

The present invention relates to a catalyst for treating an exhaust gas stream containing one or more of formaldehyde, nitric oxide (NO) and hydrocarbons, the catalyst comprising: a first washcoat layer comprising Mn supported on a CuO-Al2O3 mixed oxide; and a substrate wherein the substrate has an inlet end and an outlet end wherein the catalyst further comprises one or more platinum group metals comprising Pt, Pd, or Pt and Pd wherein the one or more platinum group metals are at least partially comprised in one or more of (a) the first washcoat layer, and (b) optionally a second washcoat layer, or (c) optionally a second washcoat layer and a third washcoat layer. Furthermore, the present invention relates to an exhaust gas treatment system comprising the catalyst, a method for treating an exhaust gas stream containing one or more of formaldehyde, nitric oxide (NO) and hydrocarbons using the catalyst, and to the use of the catalyst for oxidizing one or more of formaldehyde, nitric oxide (NO) and hydrocarbons.
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