초록 ▼

The present invention provides a ceramic filter to be used at a high temperature, and it contains a substance having preferential reactivity with an ash component contained in materials captured by the ceramic filter and not removed by a high temperature treatment such as combustion over the princip

The present invention provides a ceramic filter to be used at a high temperature, and it contains a substance having preferential reactivity with an ash component contained in materials captured by the ceramic filter and not removed by a high temperature treatment such as combustion over the principal component of the ceramic filter; the reaction between the ash component being not removed by a high temperature treatment such as combustion of the filter and remaining accumulated and the filter component to cause melting of the filter being suppressed to attain a long period of service.

대표청구항 ▼

1. A ceramic filter to be used at an elevated temperature, comprising a ceramic filter having a principal component and a substance having preferential reactivity with an ash component contained in materials captured by the ceramic filter and not removed by a high temperature combustion treatment as

1. A ceramic filter to be used at an elevated temperature, comprising a ceramic filter having a principal component and a substance having preferential reactivity with an ash component contained in materials captured by the ceramic filter and not removed by a high temperature combustion treatment as compared to the reactivity of the ash component with the principal component of the ceramic filter, whereby the principal component is protected from melting.2. A ceramic filter according to claim 1, wherein the ash component contains at least one substance selected from a group consisting of P, S, Ca, Na, Zn, Cr, Fe, Ni and Cu.3. A ceramic filter according to claim 1, wherein the substance having preferential reactivity with an ash component over the principal component of the ceramic filter is at least one substance selected from a group consisting of B, Al, Si, P, S, Cl, Ti, V, Cr, Mn, Ga, Ge, As, Se, Br, Zr, Mo, Sn, Sb, I, Ce and La.4. A ceramic filter according to claim 1, wherein the substance having preferential reactivity with an ash component over the principal component of the ceramic filter is allowed to stay within the ceramic filter.5. A ceramic filter according to claim 1, wherein the substance having preferential reactivity with the ash component over the principal component of the ceramic filter is allowed to be present on the surface of the filter.6. A ceramic filter according to claim 1, which has a honeycomb structure.7. A ceramic filter according to claim 6, wherein cells of the ceramic filter having the honeycomb structure are sealed alternately on an inlet side face and an outlet side face to form a checkered pattern on both sides.8. A ceramic filter according to claim 1, which is used as a diesel particulate filter.9. A ceramic filter according to claim 1, wherein the principal component comprises cordierite and/or zirconyl phosphate.10. A ceramic filter according to claim 1, which is equipped internally with a heater for removing most of the materials captured by the filter by a high temperature combustion treatment.11. A ceramic filter device according to claim 1, which contains catalyst components for facilitating a heat treatment of the materials captured by the filter.12. A filter device, comprising a ceramic filter according to claim 1, and a catalyst disposed upstream of the ceramic filter.13. A filter device, comprising a ceramic filter having a principle component to be used at an elevated temperature, and a pre-filter disposed upstream of the ceramic filter and containing a substance having preferential reactivity with an ash component contained in the materials captured by the ceramic filter and not removed by a high temperature combustion treatment as compared to the reactivity of the ash component with the principal component of the ceramic filter.14. A filter device according to claim 13, wherein said ash component contains at least one substance selected from a group consisting of P, S, Ca, Na, Zn, Cr, Fe, Ni and Cu.15. A filter device according to claim 13, wherein the substance having preferential reactivity with the ash component as compared to the reactivity of the ash component with the principal component of the ceramic filter is at least one substance selected from a group consisting of B, Al, Si, P, S, Cl, Ti, V, Cr, Mn, Ga, Ge, As, Se, Br, Zr, Mo, Sn, Sb, I, W, Ce and La.16. A filter device according to claim 13, wherein the substance having preferential reactivity with the ash component over the principal component of the ceramic filter is allowed to be present within the pre-filter.17. A filter device according to claim 13, wherein the substance having preferential reactivity with the ash component over the principal component of the ceramic filter is allowed to be present on the surface of the pre-filter.18. A filter device according to claim 13, wherein the ceramic filter has a honeycomb structure.19. A filter device according to claim 18, wherein cells of the ceramic filter having the honeycomb structure are sealed alternately on an inlet side face and an outlet side face to form a checkered pattern on both sides.20. A filter device according to claim 13, wherein the ceramic filter is a diesel particulate filter.21. A filter device according to claim 13, wherein the principal component of the ceramic filter comprises cordierite and/or zirconyl phosphate.22. A filter device according to claim 13, wherein the ceramic filter is internally equipped with a heater for removing most of the materials captured by the ceramic filter by a high temperature combustion treatment.23. A filter device according to claim 13, wherein the ceramic filter contains catalyst components for facilitating high temperature treatment of the materials captured by the filter.24. A filter device according to claim 13, wherein the pre-filter has a honeycomb structure.25. A filter device according to claim 24, wherein cells of the ceramic filter having the honeycomb structure are sealed alternately on an inlet side face and an outlet side face to form a checkered pattern on both sides.26. A filter device according to claim 13, wherein the pre-filter is a diesel particulate filter.27. A filter device according to claim 13, wherein the principal component of the pre-filter comprises cordierite and/or zirconyl phosphate.28. A filter device according to claim 13, wherein the pre-filter is internally equipped with a heater for removing most of the materials captured by the pre-filter by a high temperature combustion treatment.29. A filter device according to claim 13, wherein the pre-filter contains catalyst components for facilitating high temperature treatment of the materials captured by the filter.30. A filter device according to claim 13, wherein a catalyst is disposed upstream of the pre-filter.31. A filter device according to claim 13, wherein the pre-filter is exchangeable.