The Correlation between the Structure Characteristics and Gasification Characteristics of Tar Residue from Pyrolysis

Abstract

Pyrolysis is an efficient method for utilizing tar residue as a resource, and the structural properties of tar residue from pyrolysis (TRP) significantly impact subsequent gasification. The study examines the changes in the microscopic morphology, surface area, and carbon structure characteristics of TRPP as a function of pyrolysis temperature to elucidate the influence of pyrolysis temperature on the CO2 gasification characteristic parameters of TRP. Additionally, the investigation explores the relationship between surface structure and carbon structure characteristic parameters and gasification parameters at various stages. The findings indicated that the surface morphology of TRP synthesized at different pyrolysis temperatures (500–900 °C) was divided into two stages: the development of pores and the jamming of pores. With increasing pyrolysis temperature, the bigger aromatic nucleus was formed in the TRP without complete graphitization, and more amorphous carbon was consumed. TRP prepared at a pyrolysis temperature of 700 °C had the best gasification reactivity. By combining XRD, Raman, and gas adsorption techniques, the correlations between the surface structure and carbon structure parameters and the gasification characteristic parameters were established to evaluate the main factors influencing the gasification reaction. In the early stage of the gasification reaction, the carbon structure played a more important role than the surface structure. As the gasification reaction proceeded, the relationship between the surface structure and the gasification reaction was closer.