《Table 2 Acid amount of different samples》

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《Research on Catalytic Cracking Performance Improvement of Waste FCC Catalyst by Magnesium Modification》

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Figure 4 displays the Py adsorption IR spectra of S-Cat and R-Cat.The peaks at around 1 450 cm-1 and1 540 cm-1 could be ascribed to Py，which was bonded to the Lewis and Br?nsted acid sites，respectively[19].The quantities of total acid sites and strong acid sites determined by the Py adsorption IR spectra after desorption at 200°C and 350°C，respectively，are shown in Table 2.As shown in Table 2，in comparison with S-Cat，there was no obvious decrease in total acid sites for R-Cat.However，the strong acid sites of R-Cat remarkably decreased in contrast to S-Cat because of the magnesium modification.The above results are in good agreement with the NH3-TPD analysis.