Obtenção de nanotubos de carbono a partir da reação de decomposição química catalítica do metano sobre catalisadores de ferro, níquel e cobalto sintetizados via complexação metal-biopolímero

Abstract

Carbon nanotubes have been the most studied materials of the XXI century. By CVD reaction, it is possible to obtain mainly carbon nanotubes with different physicochemical properties. On this context, we studied the obtention of carbon nanotubes by catalytic decomposition of methane (CH4-CVD) over catalysts of iron, nickel and cobalt supported on alumina at 5, 10 and 20% of metal. The catalysts were synthesized by metal-complexing biopolymer methodology and characterized by TPR, XRD and BET. The variables investigated for CVD-CH4 were the type of metal particle, the catalyst reduction temperature and the temperature of the CVD-CH4. These variables influenced both the catalytic activity, as in the formation of carbon nanotubes. The iron-based catalysts have provided better amount of NTC since performed at elevated temperatures in metal reduction and reaction of CVD. The SEM images showed carbon nanotubes dispersed by the catalyst surface and images of TEM allowed the determination of NTC characteristics depending on the reaction conditions.