Gas-Phase Synthesis of Gradient Catalyst Libraries Consisting of Nanoparticles Supported on High Surface Area Porous Substrates

作者：Xia Wei^*; Mei Bastian; Muhler Martin

来源：Nanoscience and Nanotechnology Letters, 2010, 2(1): 1-6.

DOI：10.1166/nnl.2010.1046

• Catalyst Library
• Chemical Vapor Deposition
• Nanoparticles
• Porous Substrate
• Spatially Resolved Scanning Mass Spectrometry
• X-ray Photoelectron Spectroscopy

Despite the advances in high throughput experimentation in recent years the synthesis of realistic catalyst libraries especially gradient catalyst libraries remains as a challenge in material science. Recently, we have developed a method for the synthesis of gradient catalyst libraries consisting of nanoparticles supported on high surface area porous substrates. Chemical vapor deposition (CVD) was employed as a gas-phase method for the synthesis. The method made use of the lateral concentration profile of the precursor-loaded carrier gas stream during CVD, resulting in concentration profile of the deposits on porous substrates. In this report, high surface area materials of both powders (e.g., silica) and bulk composites (e.g., hierarchical carbon structures) were successfully employed as substrates for the deposition of single metal or bimetallic catalyst libraries. The synthesis was achieved by controlling the flow behavior of the effluent precursor stream. The resulting effusion cone led to a radial deposition gradient on the substrate. Different from thin film-type model catalyst libraries, the obtained catalysts can be tested under realistic reaction conditions. Methanol oxidation was studied as a test reaction using scanning mass spectrometry.

• 出版日期2010-3