US5364606-A  1990, Hamada et al. published a letter entitled "Highly Selective Reduction of Nitrogen Oxides with Hydrocarbons over H-from Zeolite Catalysts in Oxygen-Rich Atmospheres", Applied Catalysis, Volume 64, 1990, pages L1-L4;  1991, Misono et al in an article entitled "Catalytic Removal of Nitrogen Monoxide over Rare Earth Ion-Exchanged Zeolites in the Presence of Propene and Oxygen", Chemistry Letters, 1991, pages 1001-1002;  Hamada et al. entitled "Sulfate-promoted Metal Oxide Catalysts for the Selective Reduction of Nitrogen Monoxide by Propane in Oxygen-rich Atmosphere", Chemistry Letters, 1991, pages 2179-2182;  Kikuchi et al. in an article entitled "Selective Reduction of NO with Propylene on Fe-silicate Catalysts", Chemistry Letters, 1991, pages 1063-1066;  Kintaichi et al., entitled "Selective Reduction of Nitrogen Oxides with Hydrocarbons over Solid Acid Catalysts in Oxygen-Rich Atmospheres" Catalysis Letters, Volume 6, 1990, pages 237-244;  Sato et al. in al article entitled "Cu-ZSM-5 Zeolite as Highly Active Catalysts for Removal of Nitrogen Monoxide from Emission of Diesel Engines", Applied Catalysis, Volume 70, 1991, pages L1-L5;  "Catalytic Removal of Nitrogen Monoxide over Rare Earth Ion-Exchanged Zeolites in the Presence of Propene and Oxygen", by M. Misono, et al., Chemistry Letters, 1991, pp. 1001-1002;  "Catalytic Removal of Nitrogen Monoxide over Rare Earth Ion-Exchanged Zeolites in the Presence of Propene and Oxygen", by M. Misono, et al., Chemistry Letters, 1991, pp. 1001-1002.;  "Cu-ZSM-5 Zeolite as Highly Active Catalysts for Removal of Nitrogen Monoxide from Emission of Diesel Engines", by S. Y. Sato, Applied Catalysis, vol. 70, 1991, pp. L1-L5;  "Cu-ZSM-5 Zeolite as Highly Active Catalysts for Removal of Nitrogen Monoxide from Emission of Diesel Engines", by S. Y. Sato, Applied Catalysis, vol. 70, 1991, pp. L1-L5.;  "Highly selective Reduction of Nitrogen Oxides with Hydrocarbons over H-form Zeolite Catalysts in Oxygen-Rich Atmospheres", by H. Y. Hamada et al., Applied Catalysis, vol. 64, 1990, pp. L1-L4;  "Highly selective Reduction of Nitrogen Oxides with Hydrocarbons over H-form Zeolite Catalysts in Oxygen-Rich Atmospheres", by H. Y. Hamada et al., Applied Catalysis, vol. 64, 1990, pp. L1-L4.;  "Selective Reduction of NO with Propylene on Fe-silicate Catalysts", by E. Kikuchi et al., Chemistry Letters, 1991, pp. 1063-1066;  "Selective Reduction of NO with Propylene on Fe-silicate Catalysts", by E. Kikuchi et al., Chemistry Letters, 1991, pp. 1063-1066.;  "Selective Reduction of Nitrogen Oxides with Hydrocarbons over Solid Acid Catalysts in Oxygen-Rich Atmospheres", by Y. H. Kintaichi et al., Catalysis Letters, vol. 6, 1990, pp. 239-244;  "Selective Reduction of Nitrogen Oxides with Hydrocarbons over Solid Acid Catalysts in Oxygen-Rich Atmospheres", by Y. H. Kintaichi et al., Catalysis Letters, vol. 6, 1990, pp. 239-244.;  "Sulfate-promoted Metal Oxide Catalysts for the Selective Reduction of Nitrogen Monoxide by Propane in Oxygen-rich Atmosphere", by H. Y. Hamada et al., Chemistry Letters, 1991, pp. 2179-2182;  "Sulfate-promoted Metal Oxide Catalysts for the Selective Reduction of Nitrogen Monoxide by Propane in Oxygen-rich Atmosphere", by H. Y. Hamada et al., Chemistry Letters, 1991, pp. 2179-2182.