The objective of this work was to use waste semi-coke as the raw material to prepare catalysts of industrial-scale size for SO_2 removal from flue gas and to find the optimal preparation methods. Results showed that lignite semi-coke was a suitable raw material, and that the catalyst, prepared by pre-activating in an autoclave, oxidizing with HNO_3, loading with CuSO_4 and finally calcining at 700 deg C, exhibited the best desulfurizing property with a sulfur retention of about 9.6 percent SO_2/100 gC at a reaction temperature of 90 deg C. Also, the effects of H_2O content in the flue gas, reaction temperature and space velocity on the desulfurizing property were investigated to determine optimum operating conditions. An H_2O content of 7 percent was appropriate for catalysts in this work. In the temperature range 80-120 deg C, the catalyst showed good performance for SO_2 removal and was gradually deactivated at temperatures above 120 deg C. Space velocity exhibited an optimal value of 830 h~(-1). The kinetic behavior varied with space velocity and the desulfurizing property was controlled by diffusion at space velocities below 830 h~(-1), and controlled by adsorption or catalytic reaction at space velocities above 830 h~(-1).
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