《Table 3 Elemental analysis of fresh, spent and HI-regenerated catalyst samples》

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《Optimum Operating and Regeneration Parameters of ZnI_2 Catalyst for Converting Methanol to Triptane:An Ideal Component of Unleaded Aviation Gasoline》

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In order to confirm the above postulation，elemental analyses of the fresh，spent and regenerated catalysts were carried out by XRF measurement，as shown in Table 3.It is observed that the iodine to zinc molar ratio of fresh Zn I2catalyst sample was about 1.98，which was close to the theoretic value.This ratio for the spent catalyst after six reaction cycles had dropped to 1.73，which was resulted from the iodine loss.When the spent Zn I2 catalyst was regenerated by using HI，this ratio increased once again to 2.18.It has been proved that Zn O can be soluble in HI acid.In other words，HI was able to react with Zn O and could convert it into Zn I2.Therefore，it is suggested that a certain amount of Zn O was formed and a part of iodine species was lost during the catalytic reaction and there would be two causes leading to deactivation.