Effect of the Catalytic Pyrolysis Conditions on the Properties of Biological Coke

An orthogonal experiment was used to investigate the effects of cotton stalk catalytic pyrolysis conditions on the properties of biological coke. The Fourier transform infrared spectroscopy (FTIR) coupled with scanning electron microcopy (SEM) was applied to inquiry the forming mechanism of biological coke. Reaction catalyst, pyrolysis temperature, holding time and sweeping gas flow rate were considered as the key factors. The results indicate that catalyst and pyrolysis temperature are the dominant factors. Decreasing the temperature can improve bio-coke yield and functional groups retention index. Catalysts can not only improve the pyrolysis reaction rate, but also obtain the biological coke with rich void space structure and abundant surface morphology, which can be the high quality raw materials for more products with fairly high added value. Steam atmosphere is conducive to generate relatively high quality biological coke and higher calorific value gas.