CATALYST FOR LEAN BURN
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United States of America Patent
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May 16, 2019
app pub date -
Jun 22, 2017
filing date -
Jun 22, 2017
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Abstract
The present invention relates to catalysts for lean burn and provides a catalyst for lean burn that is capable of purifying NOx sufficiently and that has a high ability to purify CO and HC over a wide temperature range from low to high temperatures. The present invention provides a catalyst for a lean-burn engine to purify exhaust gas, the catalyst including: an integrally structured support; and a catalyst layer containing a precious metal element, provided on the integrally structured support and having at least two layers that include an upper layer and a lower layer; wherein the upper layer of the catalyst layer contains at least a proton-substituted β-type zeolite and a ceria-based oxide supporting rhodium, and the lower layer of the catalyst layer contains at least a NOx storage component and platinum supported on an inorganic oxide.
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