Size-Controlled Synthesis of Highly Stable and Active Pd@SiO2 Core鈥揝hell Nanocatalysts for Hydrogenation of Nitrobenzene
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- 作者：Yibo Hu ; Kai Tao ; Chunzheng Wu ; Chen Zhou ; Hongfeng Yin ; Shenghu Zhou
- 刊名：The Journal of Physical Chemistry C
- 出版年：2013
- 出版时间：May 2, 2013
- 年：2013
- 卷：117
- 期：17
- 页码：8974-8982
- 全文大小：432K
- 年卷期：v.117,no.17(May 2, 2013)
- ISSN：1932-7455
文摘
Pd@SiO2 core鈥搒hell nanoparticles were successfully synthesized by a sol鈥揼el method. Tetradecyl trimethyl ammonium bromide capped Pd nanoparticles were coated with SiO2 through the hydrolysis of tetraethylorthosilicate. The as-synthesized Pd@SiO2 particles consist of Pd cores with a particle size of 3.7 nm and SiO2 shells with a thickness from 10 to 30 nm at different synthetic conditions. The Pd@SiO2 nanocatalysts with 1.9鈥?.4 nm mesoporous SiO2 shells were generated after removal of tetradecyl trimethyl ammonium bromide from Pd@SiO2 core鈥搒hell particles by calcination and following H2 reduction. The relevant characterizations such as XRD, TEM, FT-IR, and BET were carried out for Pd@SiO2 particles, and the results showed that the Pd@SiO2 nanocatalysts were highly stable with the protection of silica shells, and the Pd cores did not increase during thermal treatment and H2 reduction. The studies of catalytic CO oxidation at high temperatures and hydrogenation of nitrobenzene with H2 were tested for Pd@SiO2 nanocatalysts, and the results indicated that Pd@SiO2 nanocatalysts were stable at high temperatures and highly active and stable for hydrogenation of nitrobenzene even after long time use.