添加ZrO2对熔铁催化剂还原的影响

STUDY ON THE REDUCTION BEHAVIOR OF FUSED IRON CATALYST CONTAINING ZIRCONIUM OXIDE

By means of temperature programmed reduction, a detailed study was made on the reduction behavior of fused iron catalyst containing ZrO_2. The addition of ZrO_2 facilitates the reduction of the catalyst.The influence of K_2O and CaO on the fused iron catalyst containing ZrO_2 was also discussed. If ZrO_2 and CaO are added together into the catalyst, the reduction of the catalyst was greatly improved. This might have resulted from the formation of the compound Ca_xZr_(1-x)O_(2-x)(x<1, CaF_2-type). The weakening of Fe-O bouds by ZrO_2 and the electron enrichiment of the surface might also contribute to this effect. It was found that K_2O existing in the catalyst containing ZrO_2 raised the initial reduction temperature, but the reduction rate increased rapidly with riseing temperature.