《Table 2 NH3-TPD and Py-FTIR analyses of the samples》

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《Synthesis of Core-Shell HZSM-5@SBA-15 Composite and Its Performance in the Conversion of Methanol to Aromatics》

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1) Density of the acid sites was assorted according to the acidic type and determined by Py-FTIR.

The NH3-TPD patterns are illustrated in Figure 5.The results for analysis of all catalysts showed two desorption peaks，denoting a low-temperature peak centered around220°C and a high-temperature peak located around 450°C，which were mainly attributed to the weak and strong acid sites，respectively[24].Compared with the pristine HZSM-5，the intensity of desorption peaks for both HZSM-5@SBA-15 and HZSM-5@Si O2 decreased，and such decrease was more apparent for the low temperature peak，which proved the function of the shell capable of reducing the acidity especially the weak acid amounts.The high-temperature peaks of them showed a little shift toward the lower temperature，suggesting a decrease of the strong acid strength.The acid data of samples are listed in Table 2，showing that the amount of weak acid for the core-shell composite decreased by about one half and the strong acid amount decreased by one third.The total acid amount of HZSM-5@SBA-15 is higher than that of HZSM-5@Si O2.