The Preparation And Research Of Functionalized Carbon Nanotubes Supported Copper And Cobalt Catalysts

As lack of oil resources and high external dependency, development of "green fuel" based on biomass syngas preparation technology is of great significance. Because of their high reactivity in conversion of syngas to higher alcohol fuel, copper and cobalt catalysts have been widely studied in recent years.In this paper, two new methods are adopted to prepare copper and cobalt catalysts.One method is to use salicylic acid functionalized carbon nanotubes as support to prepare copper and cobalt based catalyst. By measuring the space time yeild and selectivity of product, the effect of adding proportion of salicylic acid on the properties of catalyst is examined. Experimental results show that adding appropriate proportion of salicylic acid can adjust proportion of copper and cobalt particles and promote synergy between copper and cobalt catalytic process, it can improve the space time yield of higher alcohol and reduce the generation of methanol and other by-products. The other method is to use ultrasonic cell disruptor powerful ultrasonic effect, with sodium borohydride as reducing agent, copper and cobalt nanoparticles are loaded on the surface of carbon nanotubes by liquid phase reduction method. Copper and cobalt nanoparticles are well dispersed on the surface of carbon nanotubes when observed by transmission electron microscopy. Ratio of copper and cobalt precursor and carrier has important influence on the valence, copper and cobalt nanoparticles size, distribution and catalyst reactivity.