| 학회 |
한국화학공학회 |
| 학술대회 |
2007년 가을 (10/26 ~ 10/27, 한국과학기술원) |
| 권호 |
13권 2호, p.2440 |
| 발표분야 |
촉매 및 반응공학 |
| 제목 |
Characterization of Palladium (Pd) on Alumina Catalysts Prepared Using Liquid Carbon Dioxide |
| 초록 |
Supported palladium (Pd) catalysts were prepared using an environmentally benign route. Palladium (II) hexafluoroacetylacetonate (Pd(hfac)2) dissolved in liquid carbon dioxide (L-CO2) was used to deposit Pd nanoparticles onto low-surface-area α-alumina (13.3 m2/g) and high-surface area γ-alumina (207.0 m2/g) supports. Pd(hfac)2 dissolved in L-CO2 at 6.9 MPa and 28.5 oC was impregnated into the supports by slowly venting gaseous CO2 until L-CO2 was completely evaporated. After depressurization, the impregnated Pd(hfac)2 was reduced in hydrogen at a relatively low temperature of 75 oC. The adsorption isotherm of Pd(hfac)2 on γ-alumina suggests a weak interaction between the organometallic compound and the support. The average particle size on the low-surface-area α-alumina increased from 13.1±3.5 to 59.9±11.3 nm and the metal dispersion, measured by pulsed CO chemisorption, decreased from 11% to 3% as the Pd loading increased from 0.15 to 1.54 wt%. When high-surface-area γ-alumina was used, Pd particle size increased from 3.1±1.9 to 7.0±5.9 nm and metal dispersion decreased from 56 to 5 % as Pd loading increased from 0.58 to 3.94 wt%. |
| 저자 |
김재훈1, George W. Roberts2, Douglas J. Kiserow3, 김재덕1
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| 소속 |
1한국과학기술(연), 2North Carolina State Univ., 3U.S Army Research Office |
| 키워드 |
Liquid Carbon Dioxide; Palladium; Supported Catalyst
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| E-Mail |
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| 원문파일 |
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