期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 117, 期 17, 页码 8974-8982出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp3110375
关键词
-
资金
- China Zhejiang Provincial Natural Science Foundation [Y4110116]
- Ministry of Science and Technology of the People's Republic of China [2012DFA40550]
Pd@SiO2 core shell nanoparticles were successfully synthesized by a sol gel 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 1.9-2.4 nm mesoporous SiO2 shells were generated after removal of tetradecyl trimethyl. ammonium bromide from Pd@SiO2 core shell particles by calcination and following H-2 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 H-2 reduction. The studies of catalytic CO oxidation at high temperatures and hydrogenation of nitrobenzene With H-2 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.
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