Leite E R, Carreño N L, Longo E, Valentini A, Probst L F
CMDMC-LIEC, Department of Chemistry, UFSCar, Via Washington Luiz, Km 235, C.P. 676-CEP 13565-905, São Carlos, SP.
J Nanosci Nanotechnol. 2002 Feb;2(1):89-94. doi: 10.1166/jnn.2002.070.
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.
在此，我们描述了一种合成嵌入介孔二氧化硅材料中的纳米镍颗粒的新路线，该材料在催化应用方面具有优异的潜力。通过直接工艺获得了比表面积在202 - 280 m²/g范围内、孔径分布窄的介孔二氧化硅以及镍纳米颗粒（粒径在3 - 41 nm范围内）。采用了一种不同的方法来处理这种纳米复合材料。这种新方法基于形成一种将硅氧阴离子和镍阳离子螯合到高分子结构上的聚合物，并基于对热解步骤的控制。有机材料热解产生的CO/CO₂气氛促进了柠檬酸镍的还原。
