Catalytic behavior of a ZnO/TiO₂ composite in the synthesis of polycarbonate diol.

Comparing different temperature ranges of desorption peaks, the area of desorption peak in the low temperature rang changes slightly, revealing that loading ZnO has little effect on the strength of the weak acid site; the area of desorption peak in the high temperature rang shows a decreasing trend with the increase of Zn loading, which is possibly due to the fact that part of the strong acid sites on the surface were covered by ZnO and further resulted in decreased strength of strong acid sites.

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