CATALYST FOR DEPOLLUTING GAS EMISSIONS FROM MOTOR VEHICLES AND PROCESS FOR PREPARING THE SAME

The invention relates to a catalyst for depolluting gas emissions from motor vehicles and to a process for preparing the same. According to the invention, the catalyst comprises a ceramic support (1) shaped as tablets, cylindrical bars or honey comb-type monolith coated with a first layer (2) consis...

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Hauptverfasser: ILIE DAN DUMITRU, MARA ELEONORA LUMINI A, GHEORGHI MARIA, VELEA TEODOR, GORNIC CORNELIU, COVRIG ATANASIE, TERPEZEAN TAB R GHEORGHE
Format: Patent
Sprache:eng ; rum
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Zusammenfassung:The invention relates to a catalyst for depolluting gas emissions from motor vehicles and to a process for preparing the same. According to the invention, the catalyst comprises a ceramic support (1) shaped as tablets, cylindrical bars or honey comb-type monolith coated with a first layer (2) consisting of highly stabilized gamma-alumina and a second catalytically-active layer (3) consisting of noble metals, namely Pt, Pd, Rh. The claimed process consists of the manufacture of the raw ceramic paste followed by a press forming or an extrusion operation and by a thermal treatment of roasting, impregnation and activation. Invenţia se referă la un catalizator pentru depoluarea emisiilor gazoase rezultate de la autovehicule şi la un procedeu de obţinere a acestuia. Catalizatorul conform invenţiei este alcătuit dintr-un suport ceramic (1) în formă de tablete, bare cilindrice sau monolit de tip fagure, peste care este depus un prim strat (2) format din gama-alumină înalt stabilizată şi dintr-un al doilea strat activ catalitic (3), format din metale nobile, respectiv, Pt, Pd, Rh. Procedeul conform invenţiei constă în obţinerea pastei ceramice crude, urmată de o fasonare prin presare sau de o extrudare şi de un tratament termic de calcinare, impregnare şi activare. ŕ