By co-precipitation method

CaO sorbents in which Ca~(2+) and hetero-ion(with different radius) were mixed in the crystalline lattice were prepared.The effect of hetero-ion type on desulfurization reaction was studied.On the basis of the vacancy defect theory in solid-state ions diffusion

the comprehensive rules about ion-doping promoting ion diffusion in sulfated product layer were obtained.The Fourier transform infrared spectroscopy(FTIR) and X-ray diffractometer were used to analyze the desulfurization performance of each sample.The result show that

the samples mixed with Ba~(2+) has the best desulphurization performance

while that with Mg~(2+) has the worst.The dopant ions were successfully mixed with Ca~(2+) at atom level.The dopant ions brought in lattice distortion.It concluded that the dopant ions which have a larger radius can increase the number of space point defects and improve the desulfurization ability of the sample

but the smaller radius dopant ions have no positive effect.