Zeolite-based SCR catalysts and their use in diesel engine emission treatment
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01J-029/06
B01J-029/46
B01J-029/40
C01B-039/02
C01B-039/06
C01B-039/36
B01D-053/94
B01J-023/825
B01J-023/83
B01J-037/00
B01J-037/02
B01J-037/08
출원번호
US-0662946
(2015-03-19)
등록번호
US-9403156
(2016-08-02)
발명자
/ 주소
Narula, Chaitanya K.
Yang, Xiaofan
출원인 / 주소
UT-BATTELLE, LLC
대리인 / 주소
Scully, Scott, Murphy & Presser, P.C.
인용정보
피인용 횟수 :
0인용 특허 :
49
초록▼
A catalyst comprising a zeolite loaded with copper ions and at least one trivalent metal ion other than Al+3, wherein the catalyst decreases NOx emissions in diesel exhaust. The trivalent metal ions are selected from, for example, trivalent transition metal ions, trivalent main group metal ions, and
A catalyst comprising a zeolite loaded with copper ions and at least one trivalent metal ion other than Al+3, wherein the catalyst decreases NOx emissions in diesel exhaust. The trivalent metal ions are selected from, for example, trivalent transition metal ions, trivalent main group metal ions, and/or trivalent lanthanide metal ions. In particular embodiments, the catalysts are selected from Cu—Fe-ZSM5, Cu—La-ZSM-5, Fe—Cu—La-ZSM5, Cu—Sc-ZSM-5, and Cu—In-ZSM5. The catalysts are placed on refractory support materials and incorporated into catalytic converters.
대표청구항▼
1. A catalyst comprising a pentasil-containing zeolite loaded with copper ions and at least one trivalent metal ion other than Al+3, wherein said copper ions are present in said catalyst in a loading amount of at least 1 wt % and said at least one trivalent metal ion other than Al3+ is present in sa
1. A catalyst comprising a pentasil-containing zeolite loaded with copper ions and at least one trivalent metal ion other than Al+3, wherein said copper ions are present in said catalyst in a loading amount of at least 1 wt % and said at least one trivalent metal ion other than Al3+ is present in said catalyst in a loading amount of less than 1 wt %, and said copper and trivalent metal ion loading amounts are effective to achieve a NOx conversion at 150° C. of at least 50% in the presence of an ammonia reductant. 2. The catalyst of claim 1, wherein said at least one trivalent metal ion is selected from trivalent transition metal ions. 3. The catalyst of claim 2, wherein said trivalent transition metal ions are selected from Sc+3, Y+3, V+3, Nb+3, Cr+3, Fe+3, and Co+3. 4. The catalyst of claim 1, wherein said at least one trivalent metal ion is selected from trivalent main group metal ions. 5. The catalyst of claim 4, wherein said trivalent main group metal ions are selected from Ga+3, In+3, As+3, Sb+3, and Bi+3. 6. The catalyst of claim 1, wherein said at least one trivalent metal ion is selected from trivalent lanthanide metal ions selected from La+3, Ce+3, Pr+3, Nd+3, Sm+3, Eu+3, Gd+3, Tb+3, Dy+3, Ho+3, Er+3, Yb+3, and Lu+3. 7. The catalyst of claim 6, wherein said trivalent lanthanide metal ions are selected from La+3, Ce+3, Pr+3, and Nd+3. 8. The catalyst of claim 1, wherein said at least one trivalent metal ion is selected from Fe+3, In+3, Sc+3, and La+3. 9. The catalyst of claim 1, wherein said at least one trivalent metal ion is a combination of at least two trivalent metal ions. 10. The catalyst of claim 9, wherein said at least two trivalent metal ions are selected from trivalent transition metal ions. 11. The catalyst of claim 9, wherein at least one trivalent metal ion is a trivalent transition metal ion and at least one trivalent metal ion is a trivalent lanthanide metal ion. 12. The catalyst of claim 9, wherein at least one trivalent metal ion is a trivalent transition metal ion and at least one trivalent metal ion is a trivalent main group metal ion. 13. The catalyst of claim 9, wherein at least one trivalent metal ion is a trivalent main group metal ion and at least one trivalent metal ion is a trivalent lanthanide metal ion. 14. The catalyst of claim 1, wherein said zeolite is ZSM-5. 15. The catalyst of claim 1, wherein said catalyst exhibits a NOx conversion at 150° C. of at least 60%. 16. The catalyst of claim 15, wherein said catalyst also exhibits a NOx conversion at 200° C. of at least 80%. 17. The catalyst of claim 15, wherein said catalyst also exhibits a NOx conversion at 600° C. of a least 60%. 18. A catalytic converter comprising a catalyst loaded onto a refractory substrate, said catalyst comprising a pentasil-containing zeolite loaded with copper ions and at least one trivalent metal ion other than Al+3, wherein said copper ions are present in said catalyst in a loading amount of at least 1 wt % and said at least one trivalent metal ion other than Al3+ is present in said catalyst in a loading amount of less than 1 wt %, and said copper and trivalent metal ion loading amounts are effective to achieve a NOx conversion at 150° C. of at least 50% in the presence of an ammonia reductant. 19. The catalytic converter of claim 18, wherein said at least one trivalent metal ion is selected from trivalent transition metal ions. 20. The catalytic converter of claim 19, wherein said trivalent transition metal ions are selected from Sc+3, Y+3, V+3, Nb+3, Cr+3, Fe+3, and Co+3. 21. The catalytic converter of claim 18, wherein said at least one trivalent metal ion is selected from trivalent main group metal ions. 22. The catalytic converter of claim 21, wherein said trivalent main group metal ions are selected from Ga+3, In+3, As+3, Sb+3, and Bi+3. 23. The catalytic converter of claim 18, wherein said at least one trivalent metal ion is selected from trivalent lanthanide metal ions selected from La+3, Ce+3, Pr+3, Nd+3, Sm+3, Eu+3, Gd+3, Tb+3, Dy+3, Ho+3, Er+3, Tm+3, Yb+3, and Lu+3. 24. The catalytic converter of claim 23, wherein said trivalent lanthanide metal ions are selected from La+3, Ce+3, Pr+3, and Nd+3. 25. The catalytic converter of claim 18, wherein said at least one trivalent metal ion is selected from Fe+3, In+3, Sc+3, and La+3. 26. The catalytic converter of claim 18, wherein said at least one trivalent metal ion is a combination of at least two trivalent metal ions. 27. The catalytic converter of claim 26, wherein said at least two trivalent metal ions are selected from trivalent transition metal ions. 28. The catalytic converter of claim 26, wherein at least one trivalent metal ion is a trivalent transition metal ion and at least one trivalent metal ion is a trivalent lanthanide metal ion. 29. The catalytic converter of claim 26, wherein at least one trivalent metal ion is a trivalent transition metal ion and at least one trivalent metal ion is a trivalent main group metal ion. 30. The catalytic converter of claim 26, wherein at least one trivalent metal ion is a trivalent main group metal ion and at least one trivalent metal ion is a trivalent lanthanide metal ion. 31. The catalytic converter of claim 18, wherein said zeolite is ZSM-5. 32. The catalytic converter of claim 18, wherein said catalyst exhibits a NOx conversion at 150° C. of at least 60%. 33. The catalytic converter of claim 32, wherein said catalyst exhibits a NOx conversion at 200° C. of at least 80%. 34. The catalytic converter of claim 32, wherein said catalyst exhibits a NOx conversion at 600° C. of at least 60%. 35. The catalytic converter of claim 18, wherein said refractory substrate is a honeycomb structure. 36. The catalyst of claim 1, wherein said copper ions are present in said catalyst in a loading amount of at least 1.5 wt % and said at least one trivalent metal ion is present in said catalyst in a loading amount of less than 1 wt %. 37. The catalyst of claim 1, wherein said copper ions are present in said catalyst in a loading amount of at least 2 wt % and said at least one trivalent metal ion is present in said catalyst in a loading amount of less than 1 wt %.
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이 특허에 인용된 특허 (49)
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