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Keywords:

  • carbon dioxide;
  • catalysis;
  • coal;
  • gasification;
  • kinetics

Abstract

The effects of temperature, catalyst type, and catalyst loading on the gasification of coal char were investigated in a fixed-bed reactor. The effects of catalyst dispersion, Brunauer–Emmett–Teller (BET) specific surface area, and crystallite constituents of Jinyou coal char with different loadings of K and Ca were also analyzed by energy-dispersive X-ray analysis (EDX), N2 adsorption at 77 K, and X-ray diffraction (XRD). Results showed that K2CO3 could increase the gasification rate significantly for gasification temperatures greater than 850 °C. Cation species could have a significant influence on the catalytic activity. The reactivity of the coal char increased continuously with catalyst loading and resulted in a loading saturation level (LSL) of 10 % for K. Compared with the raw char, K and Ca added to Jinyou coal decreased the BET specific surface area. Moreover, K and Ca added to Jinyou coal altered the crystallite constituents during the process of coking and gasification, which indicated that some K and Ca reacted with minerals in the Jinyou coal during the process of coking and gasification and partly deactivated the K and Ca.