Reactive Deposition of Palladium Nanoparticles onto Zeolite Membranes in Supercritical CO2

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• 作者：Xiufeng Liu ; Wei Liu ; Jian Li ; Yushan Zhang ; Lin Lang ; Laibo Ma ; Baoquan Zhang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2010
• 出版时间：September 15, 2010
• 年：2010
• 卷：49
• 期：18
• 页码：8826-8831
• 全文大小：303K
• 年卷期：v.49,no.18(September 15, 2010)
• ISSN：1520-5045

文摘

Pd/Si-MFI membranes are fabricated by depositing palladium nanoparticles onto Si-MFI membranes via opposing reactants chemical fluid deposition in supercritical carbon dioxide. Palladium hexafluoroacetylacetonate [Pd(hfac)₂] and ethanol are used as the Pd precursor and the reducing agent, respectively, in the deposition process. The resulting Pd/Si-MFI membrane is characterized using SEM, XRD, EPMA, TEM, and EDX techniques. It is demonstrated that a continuous layer of Pd particles with size of 10 nm is covered on the matrix surface while 30-nm Pd particles are plugged into the defects within the matrix. The H₂/N₂ permselectivity has been significantly increased due to the deposition of Pd nanoparticles in the Si-MFI membrane, which could keep stable below the critical temperature. This bifunctional membrane and similar membranes possess the application potential to achieve various one-step syntheses.