| 高分散度Pt-Ir疏水催化剂制备及氢-水液相交换催化性能研究 | |
| Highly Dispersed Pt-Ir Hydrophobic Catalysts: Preparation and Catalytic Activity for Hydrogen-water Liquid Exchange Reaction | |
| 摘要: 用乙二醇作为碳黑分散溶剂，微波辐射快速加热，1～2 MPa压力下制备了Pt/C及不同Pt、Ir比例的Pt-Ir/C催化剂，用浸渍还原法制备了Pt-Ir/C催化剂，并用XRD，TEM和XPS对催化剂进行了表征。将两种方法制备的Pt/C，Pt-Ir/C催化剂与聚四氟乙烯(PTFE)一起负载于多孔金属载体，得到疏水催化剂，考查了其对氢-水液相交换反应的催化活性。微波辐射加热法制备的Pt/C和Pt-Ir/C催化剂活性金属粒子在碳载体上分布均匀，平均粒径大小分别为2.1 nm和2.2 nm，Ir的加入改变了活性金属粒子的形状和晶相结构，Pt-Ir/C中Pt以Pt(0)，Pt(Ⅱ)和Pt(Ⅳ)形式存在，Ir以Ir(0)和Ir(Ⅳ)形式存在。浸渍还原法制备的Pt-Ir/C催化剂活性金属粒子有明显团聚，晶粒平均大小为4.8 nm。微波辐射法所得催化剂对氢-水液相交换反应有更高催化活性；Pt中掺入适量Ir，可提高单一Pt催化剂活性，Pt、Ir原子比例为4∶1时，催化剂活性最高。 | |
| 关键词: 疏水催化剂 氢-水液相催化交换 氢同位素分离 微波加热法 Pt-Ir/C | |
| 基金项目: | |
| Abstract: Pt/C and Pt-Ir/C catalysts with different ratios of Pt and Ir were prepared in the disperse solvent ethylene glycol by microwave heating method at 1～2 MPa, and Pt-Ir/C catalysts were prepared by conventional impregnation-reduction method. The catalysts were characterized by XRD, TEM and XPS. Polytetrafluoroethylene (PTFE) and carbon-supported catalysts were supported on porous metal to obtain hydrophobic catalysts. The metal particles for Pt/C and Pt-Ir/C catalysts were dispersed on carbon black by microwave heating method with a narrow size distribution, the mean particles sizes of two kinds of catalysts were 2.1 nm and 2.2 nm, and Pt and Ir existed as Pt(0), Pt(Ⅱ), Pt(Ⅳ), Ir(0) and Ir(Ⅳ) for Pt-Ir/C catalysts, respectively. The Pt-Ir metal particles of Pt-Ir/C catalysts conglomerated markedly by impregnation-reduction method, and the mean grain particles size was 4.8 nm. The shape and crystal structure of active mental particles would be changed upon the addition of Ir. The catalysts obtained from microwave heating method had higher catalytic activity for hydrogen-water liquid exchange reaction than those for the impregnation-reduction method. The catalytic activity could be increased when appropriate metal Ir was mixed into uniform Pt catalysts. And the hydrophobic catalysts exhibited the best catalytic activity when the atomic ratio of Pt and Ir was 4∶1. | |
| Keywords: hydrophobic catalysts hydrogen-water liquid exchange reaction hydrogen isotope separation microwave heating method | |
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| 胡胜,朱祖良,罗顺忠,王和义,肖成建,罗阳明,王昌斌.高分散度Pt-Ir疏水催化剂制备及氢-水液相交换催化性能研究[J].无机化学学报,2007,23(1):91-96. | |
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