反应过程中升华型催化剂的物性变化(Ⅲ)Zn(Ac)_2 的程序升温脱附测定

Variation of Physical Properties of Sublimable Catalysts in the Process of Chemical Reaction(Ⅲ)Determination of Temperature Programmed Desorption on Zn(Ac) 2 Catalyst

用程序升温脱附法测定了乙炔在衰化程度不同的醋酸锌催化剂上的脱附峰面积。发现乙炔在纯载体活性炭上的脱附峰面积为零，证明所得峰面积表征了乙炔在醋酸锌上的化学吸附量。衰化程度不同的催化剂上乙炔的程序升温脱附峰面积与其残留量呈线性关系，证明该催化剂失活的主要原因是活性组分醋酸锌的升华流失造成的。

The Temperature Programmed Desorption(TPD) method is applied to research the series deactivation catalysts of Zn(Ac) 2.The catalyst samples was obtained from chemical factory. It is found that the TPD peak area of acetylene is proportional to the remnant Zn(Ac) 2 content in catalyst and the TPD peak area is zero on the pure support (activated). Therefore, It is proved that the deactivation of Zn(Ac) 2 catalyst results from the loss by sublimation of active species Zn(Ac) 2 in the process of chemical reaction.