Synthesis of mesoporous silica with embedded nickel nanoparticles for catalyst applications.
Here we describe a new route for the synthesis of nanometric Ni particles embedded in a mesoporous silica material with excellent potential for catalytic applications. Mesoporous silica with a surface area in the range of 202-280 m2/g, with narrow pore size distribution and Ni nanoparticles (particles in the range of 3-41 nm) were obtained in a direct process. A different approach was adopted to process such a nanocomposite. This new approach is based on the formation of a polymer with the silicon oxianion and nickel cation chelated to the macromolecule structure and on the control of the pyrolysis step. The CO/CO2 atmosphere resulting from the pyrolysis of the organic material promotes the reduction of the Ni citrate.
Leite
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CMDMC-LIEC, Department of Chemistry, UFSCar, Via Washington Luiz, Km 235, C.P. 676-CEP 13565-905, São Carlos, SP.
Carreño
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NL
Longo
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Valentini
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A
Probst
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D000081008:Bicyclic Monoterpenes; D002384:Catalysis; D003460:Crystallization / Q000379:methods*; D005782:Gels / Q000737:chemistry; D006358:Hot Temperature; D046911:Macromolecular Substances; D008422:Materials Testing; D000432:Methanol / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D008968:Molecular Conformation; D036103:Nanotechnology / Q000379:methods*; D009532:Nickel / Q000737:chemistry*; D010316:Particle Size; D016062:Porosity; D012822:Silicon Dioxide / Q000138:chemical synthesis / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature; D013729:Terpenes / Q000737:chemistry; D014961:X-Ray Diffraction
D000081008:Bicyclic Monoterpenes; D005782:Gels; D046911:Macromolecular Substances; D013729:Terpenes; C030216:pinane; D012822:Silicon Dioxide; D009532:Nickel; D000432:Methanol