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AssigneeBattelle Memorial Institute
InventorsCharles H. F. Peden, Feng Gao, Yilin Wang, Marton Kollar, Janos Szanyi
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Cu-exchanged zeolite catalysts with a chabazite structure containing selected concentrations of alkali ions or alkaline-earth ions and a lower concentration of (Cu) ions are described and a sequential process for making. Catalysts of the present invention reduce light-off temperatures providing enhanced low-temperature conversion of NOx gases. Catalysts of the present invention also exhibit high selectivity values compared to conventional NOx reduction catalysts.
A modified NOx reduction catalyst that contains less than 2 percent copper metal by weight in a synthetic chabazite zeolite incorporating at least one material selected from the group consisting of Na, Li, K and Ca and provides a light off temperature less than 175° C., the catalyst produced by the process of:
A process for fabricating a modified NOx reduction catalyst that provides a light off temperature less than 175° C., the process comprising:
A process for fabrication of a NOx reduction catalyst that contains less between 0.01 and 2 percent copper metal by weight in a zeolite and provides a light off temperature less than or equal to about 175° C. the process comprising the steps of:
A modified NOX reduction catalyst that contains less than 2 percent copper metal by weight in a synthetic chabazite zeolite incorporating at least one material selected from the group consisting of Na, Li, K and Ca and provides a light off temperature less than 150° C.
Dependencies are inferred from the claim text.