flow at 500 °C. The CCVD syntheses were carried out, in the presenceof i-C4H10–H2, at 700 °C. For this purpose, 0.5 g of reduced catalystwas placed in a quartz boat inside the quartz reactor, located in ahorizontal electric furnace, and preliminarily heated up to synthesistemperature under 120 cm3/min 1:1 He–H2 flow. Helium was thenreplaced with i-C4H10 keeping a constant flow ratio and total flowrate. The reactions were stopped after 2 h and the raw productswere subsequently cooled down to room temperature in He atmosphere.The weight percentage of C deposited was calculated as C