Process for producing exhaust-gases-purifying catalyst
AssigneeToyota Jidosha Kabushiki Kaisha
InventorRiemi Muramoto
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Abstract
A process for producing an exhaust-gases-purifying catalyst includes the steps of loading an NO.sub.x adsorbent on a porous support, carbonating the porous support with the NO.sub.x adsorbent loaded, thereby converting the NO.sub.x adsorbent into carbonate, and loading a noble metal catalyst ingredient on the porous support with the carbonate loaded. The process can produce an exhaust-gases-purifying catalyst on which the NO.sub.x adsorbent and the noble metal catalyst ingredient are loaded in large amounts and which can stably and efficiently purify NO.sub.x during the fuel-lean side (i.e., in the oxygen-rich atmospheres) driving.
Claims19
A process for producing an exhaust-gases-purifying catalyst, comprising the steps of:
- loading an NO.sub.x adsorbent on a porous support, said adsorbent being capable of forming a carbonate;
- carbonating said porous support with said NO.sub.x adsorbent loaded, thereby converting said NO.sub.x adsorbent into carbonate;
- and
- loading a noble metal catalyst ingredient on said porous support with said carbonate loaded, said adsorbent being inhibited, by the converting into carbonate, from eluting into an aqueous solution.
Dependencies are inferred from the claim text.