Study On Catalytic Pyrolysis Of Coking-coal Tailings From Fenxi Coal Mining Company

Catalytic pyrolysis of Fenxi coking coal tailings was carried out with a fixed-bed reactor on the basis of investigating basic characeristics of the coal tailings.14kinds of metal oxides were selected as catalysts to pyrolyze coal tailings to study pyrolytic properties.6types of high activity metal oxides supported catalysts were prepared with a incipient wetness impregnation method, like NixOY、AgxOY、CrXOY、CoXOY、CuXOY and FeXOY. NiXOY/Y-Al2O3. It deals with the effects of loading of active matter, calcination temperature, and impregnation time upon catalytic activity of the catalysts. It gives good performance of metal oxide/γ-Al2O3in catalytic pyrolysis of cocking coal tailings to produce gases, especially to produce hydrogen. Here, catalysts of NiXOY/γ-Al2O3shows best activity in pyrolysis of coal tailing to produce hydrogen. Hydrogen yield increases by60%. Then, double layer metal oxide supported catalysts were further prepared by impregnating active matter on γ-Al2O3in step. Two catalysts like MgO-NiO/γ-Al2O3and CaO-NiO/γ-Al2O3were prepared. Catalytic activity of the catalysts takes much improvement in this way. Hydrogen yield increases about68%in pyrolysis of coal tailings, and CaO-NiO/γ-Al2O3also gives good performance in the pyrolysis. Furthermore, it finds that structure of the catalyst also takes effects upon catalytic activity in pyrolysis of coal tailing. In the mean time, proximate, ultimate and calorifc value of pyrolytic char were carried out in the experiment to understand char characteristics and utilizatio. Overally, results of this paper is possible to find a way for efficient utilization of coking coal tailings in Fenxi Coal Industry Company.