Catalytic gasification of coal using eutectic salts: Reaction kinetics with binary and ternary eutectic catalysts Article

cited authors

  • Sheth, A; Yeboah, YD; Godavarty, A; Xu, Y; Agrawal, PK

fiu authors

abstract

  • Kinetic studies of the catalytic steam gasification of Illinois No. 6 coal were carried out using binary and ternary eutectic salt mixtures in a fixed-bed reactor. The effects of major process variables such as temperature, pressure, catalyst loading and steam flow rate were evaluated for the binary 29% Na2CO3-71% K2CO3 and ternary 43.5% Li2CO3-31.5% Na2CO3-25% K2CO3 eutectic catalyst systems. A Langmuir-Hinshelwood rate expression was developed to explain the reaction mechanism for steam gasification using the binary and ternary catalysts. The activation energy of the ternary catalyst (98 kJ/mol) was less than that of the binary catalyst (201 kJ/mol) or single salt such as K2CO3 (170 kJ/mol). The molar heats of adsorption for the ternary and binary catalysts were exothermic and about 180 and 92 kJ/mol, respectively. The molten nature of the ternary eutectic at the gasification temperatures and its lower activation energy favored higher gasification rates compared to the single and binary alkali metal salts. © 2002 Elsevier Science Ltd. All rights reserved.

publication date

  • February 1, 2003

Digital Object Identifier (DOI)

start page

  • 305

end page

  • 317

volume

  • 82

issue

  • 3