《Table 3The product compositions and TIPB conversion (TOS=5 min) over ZSM‐5 modified by H3PO4 soluti

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《高硅ZSM-5原粉的外表面改性及其在甲醇制丙烯反应中的应用（英文）》

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a Determined by XRF.b Determined by XPS.

Given the higher propene selectivity and longer lifetime observed on ZSM‐5‐P‐1，the H3PO4 concentration in the post‐synthetic treatment was further adjusted to optimize the catalytic performance.The product Si/Al ratios and P contents of the samples are summarized in Table 3.No regular change in the Si/Al ratio can be observed following the increase of H3PO4concentration，and the samples have similar bulk and surface P contents.The insignificant effect of H3PO4 solution on the dealumination of high‐Si as‐made ZSM‐5 is understandable，since high‐Si zeolites are generally acknowledged to be resistant to the acid solution.Indeed，we have carried out post‐synthetic HCl treatment of the same precursor and almost unchanged Si/Al ratios are obtained（Table S2）.