Pt-Rh 이원금속 촉매의 구조와 반응성에 관한 연구

김영길; 신기환; 이재의

Journal of the Korean Industrial and Engineering Chemistry, Vol.7, No.4, 661-669, August, 1996

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Pt-Rh 이원금속 촉매의 구조와 반응성에 관한 연구

A Study on Structure and Reactivity of Pt-Rh Bimetallic Catalysts

김영길, 신기환, 이재의

초록

NaY 제올라이트에 Pt/Rh비를 달리하여 이온교환법으로 제조한 Pt-Rh촉매의 특성을 ¹²⁹Xe-NMR과 EXAFS 방법으로 특성조사를 하였다. ¹²⁹Xe-NMR과 EXAFS 자료는 PtRh 이원금속 클러스터의 표면으로 Rh 원자들이 모이는 것으로 나타났다. 모사 자동차 배기가스를 사용하여 희박, 과농 및 양론조건에서 CO, HC 및 NOx 전환율을 측정하였으며, Pt-Rh/NaY(Pt/Rh=1) 이원금속 촉매가 다른 촉매들보다 세가지 오염물질에 대한 반응활성이 높게 나타남을 알 수 있었다.

Pt-Rh/NaY catalysts with various Pt/Rh ratios were prepared by an ion-exchange method and their characteristics were investigated by ¹²⁹Xe-NMR and EXAFS. Both the ¹²⁹Xe-NMR and EXAFS data indicate that the surface of PtRh bimetallic clusters was enriched with Rh atoms. The catalytic activities of these catalysts for conversion of CO, HC and NOx were measured by using simulated automobile engine exhausts under lean, rich and stoichiometric conditions. The Pt-Rh/NaY(Pt/Rh= 1) catalyst exhibited the greatest reactive activity among the catalysts used in this study.

[References]

Tayler KC, "Catalysis and Automotive Pollution Control," ed. A. Crucq and A. Frennet., 97, Elsevier Science Publishers B.V., Amdesterdam (1987)
Wang T, Schmidit LD, J. Catal., 71, 411 (1981)
Oh SE, Carpenter JE, J. Catal., 98, 178 (1986)
Anderson JA, J. Catal., 142, 153 (1993)
Ahn DH, Lee JS, Nomura M, Sachtler WMH, Morretti G, Woo SI, Ryoo R, J. Catal., 133, 191 (1992)
Yang OB, Woo SI, Ryoo R, J. Catal., 123, 375 (1990)
Pak C, Ph.D. Dissertation, Korea Advanced Institutte of Science and Technology, Taeduck Science Town, Korea (1995)
Ryoo R, Pak C, Cho SJ, Jpn. J. Appl. Phys., 32(2), 475 (1993)
Grill CM, McClory MM, Stevenson JM, Gonzalez RD, J. Catal., 69, 454 (1981)
Grill CM, Gonzalez RD, J. Catal., 64, 487 (1980)
Soma-Noto Y, Schtler WMH, J. Catal., 32, 315 (1974)
McClory MM, Gonzalez RD, J. Phys. Chem., 90, 628 (1986)
Kimisch RL, Taylor KC, Environ. Sci. Technol., 7, 127 (1973)
Ryoo R, J. Korean Ind. Eng. Chem., 2(1), 1 (1991)
Ryoo R, Cho SJ, Pak C, Kim JG, Ihm SK, Lee JY, J. Am. Chem. Soc., 114, 76 (1992)
Tzou MS, Asakura K, Yamazaki Y, Kuroda H, Catal. Lett., 11, 33 (1991)
Solymosi F, Pasztor M, J. Phys. Chem., 89, 4789 (1985)
Cavanagh RR, Yates JT, J. Phys. Chem., 74, 4150 (1981)
Cho SJ, Lee JY, Yie JE, Ryoo R, J. Catal., in press

[Referenced By]

[1] Tayler KC, "Catalysis and Automotive Pollution Control," ed. A. Crucq and A. Frennet., 97, Elsevier Science Publishers B.V., Amdesterdam (1987)

[2] Wang T, Schmidit LD, J. Catal., 71, 411 (1981)

[3] Oh SE, Carpenter JE, J. Catal., 98, 178 (1986)

[4] Anderson JA, J. Catal., 142, 153 (1993)

[5] Ahn DH, Lee JS, Nomura M, Sachtler WMH, Morretti G, Woo SI, Ryoo R, J. Catal., 133, 191 (1992)

[6] Yang OB, Woo SI, Ryoo R, J. Catal., 123, 375 (1990)

[7] Pak C, Ph.D. Dissertation, Korea Advanced Institutte of Science and Technology, Taeduck Science Town, Korea (1995)

[8] Ryoo R, Pak C, Cho SJ, Jpn. J. Appl. Phys., 32(2), 475 (1993)

[9] Grill CM, McClory MM, Stevenson JM, Gonzalez RD, J. Catal., 69, 454 (1981)

[10] Grill CM, Gonzalez RD, J. Catal., 64, 487 (1980)

[11] Soma-Noto Y, Schtler WMH, J. Catal., 32, 315 (1974)

[12] McClory MM, Gonzalez RD, J. Phys. Chem., 90, 628 (1986)

[13] Kimisch RL, Taylor KC, Environ. Sci. Technol., 7, 127 (1973)

[14] Ryoo R, J. Korean Ind. Eng. Chem., 2(1), 1 (1991)

[15] Ryoo R, Cho SJ, Pak C, Kim JG, Ihm SK, Lee JY, J. Am. Chem. Soc., 114, 76 (1992)

[16] Tzou MS, Asakura K, Yamazaki Y, Kuroda H, Catal. Lett., 11, 33 (1991)

[17] Solymosi F, Pasztor M, J. Phys. Chem., 89, 4789 (1985)

[18] Cavanagh RR, Yates JT, J. Phys. Chem., 74, 4150 (1981)

[19] Cho SJ, Lee JY, Yie JE, Ryoo R, J. Catal., in press