Synthesis, Characterization, and Catalytic Properties of Novel Single-Site and Nanosized Platinum Catalysts
Synthesis, Characterization, and Catalytic Properties of Novel Single-Site and Nanosized Platinum Catalysts
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DOI：
10.1021/om200778r
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发表时间：
2012-08-13
期刊：
影响因子：
2.8
通讯作者：
Guo, Neng
中科院分区：
文献类型：
--
作者：
Bonati, Matteo L. M.;Douglas, Thomas M.;Guo, Neng
新型单中心铂催化剂已经通过铂（II）有机金属化合物与部分脱羟基二氧化硅反应合成。用IR、MAS NMR、EXAFS等方法对所得材料进行了表征。此外，单位点铂催化剂在空气中煅烧以除去配体并产生纳米尺寸的铂颗粒，其通过TEM和H-2化学吸附表征。测试所有催化剂用于甲苯的氢化。单位点铂催化剂的活性低于商业Pt/SiO2催化剂与可比的铂负载，这已被归因于配体效应。相反，纳米尺寸的铂催化剂比商业Pt/SiO2催化剂更活性，由于它们的高分散性和小的颗粒尺寸。
Novel single-site platinum catalysts have been synthesized by reacting platinum(II) organometallics with partially dehydroxylated silica. The resulting materials have been characterized by various methods such as IR, MAS NMR, and EXAFS. Further, the single-site platinum catalysts were calcined in air to remove the ligand and produce nanosized platinum particles, that were characterized by TEM and H-2 chemisorption. All catalysts were tested for the hydrogenation of toluene. The single-site platinum catalysts were less active than a commercial Pt/SiO2 catalyst with comparable platinum loading, and this has been ascribed to ligand effects. Conversely, the nanosized platinum catalysts were more active than the commercial Pt/SiO2 catalyst due to their high dispersion and small particle sizes.