A method of treating a cold-start engine exhaust gas stream comprising hydrocarbons and other pollutants, the method comprising: flowing the exhaust gas stream over a molecular sieve bed, the molecular sieve bed comprising an alkali metal cation-exchanged molecular sieve having intersecting 10- and
A method of treating a cold-start engine exhaust gas stream comprising hydrocarbons and other pollutants, the method comprising: flowing the exhaust gas stream over a molecular sieve bed, the molecular sieve bed comprising an alkali metal cation-exchanged molecular sieve having intersecting 10- and 12-membered ring pore channels, to provide a first exhaust stream; flowing the first exhaust gas stream over a catalyst to convert any residual hydrocarbons and other pollutants contained in the first exhaust gas stream to innocuous products to provide a treated exhaust stream; and discharging the treated exhaust stream into the atmosphere.
대표청구항▼
1. A method of treating a cold-start engine exhaust gas stream comprising hydrocarbons and other pollutants, the method comprising: a) flowing the exhaust gas stream over a molecular sieve bed, the molecular sieve bed comprising an alkali metal cation-exchanged molecular sieve having intersecting 10
1. A method of treating a cold-start engine exhaust gas stream comprising hydrocarbons and other pollutants, the method comprising: a) flowing the exhaust gas stream over a molecular sieve bed, the molecular sieve bed comprising an alkali metal cation-exchanged molecular sieve having intersecting 10- and 12-membered ring pore channels, having increased hydrothermal stability to provide a first exhaust stream;b) flowing the first exhaust gas stream over a catalyst to convert any residual hydrocarbons and other pollutants contained in the first exhaust gas stream to innocuous products to provide a treated exhaust stream; andc) discharging the treated exhaust stream. 2. The method of claim 1, wherein the engine is an internal combustion engine. 3. The method of claim 2, wherein the internal combustion engine is an automobile engine. 4. The method of claim 1, wherein the molecular sieve has at least 95% of its ionexchangeable sites exchanged with an alkali metal cation. 5. The method of claim 1, wherein the alkali metal cation is selected from the group consisting of sodium, potassium, cesium, and mixtures thereof. 6. The method of claim 1, wherein the alkali metal cation is sodium. 7. The method of claim 1, wherein the molecular sieve is selected from the group consisting of ITQ-22, MCM-68, NU-87, SSZ-56, SSZ-57, a CON type molecular sieve, and mixtures thereof. 8. The method of claim 7, wherein the CON type molecular sieve is selected from the group consisting of CIT-I, ITQ-24, SSZ-26, SSZ-33, and mixtures thereof. 9. The method of claim 7, wherein the CON type molecular sieve is selected from the group consisting of SSZ-26, SSZ-33, and mixtures thereof. 10. The method of claim 1, wherein the molecular sieve has deposited on it a metal selected from the group consisting of platinum, palladium, rhodium, ruthenium, and mixtures thereof. 11. The method of claim 10, wherein the metal is a mixture of platinum and palladium. 12. A method for removing toluene from a gaseous hydrocarbon stream comprising: a) passing a toluene-containing hydrocarbon stream over an adsorbent comprising an alkali metal cation-exchanged molecular sieve having intersecting 10- and 12-membered ring pore channels, having increased hydrothermal stability; andb) recovering a product stream with reduced toluene content. 13. The method of claim 12, wherein the alkali metal cation is selected from the group consisting of sodium, potassium, cesium, and mixtures thereof. 14. The method of claim 12, wherein the alkali metal cation is sodium. 15. The method of claim 12, wherein the molecular sieve is selected from the group consisting of ITQ-22, MCM-68, NU-87, SSZ-56, SSZ-57, a CON type molecular sieve, and mixtures thereof. 16. The method of claim 15, wherein the CON type molecular sieve is selected from the group consisting of CIT-I, ITQ-24, SSZ-26, SSZ-33, and mixtures thereof. 17. The method of claim 15, wherein the CON type molecular sieve is selected from the group consisting of SSZ-26, SSZ-33, and mixtures thereof.
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이 특허에 인용된 특허 (19)
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