铵、银复合掺杂磷钨酸催化合成己二酸二烷基酯

Synthesis of Dialkyl Adipate using Ammonium and Silver Co-doped Phosphotungstic Acid as Catalyst

摘要:

采用离子交换法制备了铵、银复合掺杂磷钨酸催化剂，并将其应用于合成己二酸二烷基酯的反应中。采用FT-IR、XRD及Hammett指示剂法对催化剂的结构、酸强度与表面酸量进行表征。结果表明，(NH4)0.5Ag0.5H2PW12O40的催化活性最高，酯化率达到99.8%，高于传统的单一型阳离子掺杂磷钨酸。考察了(NH4)0.5Ag0.5H2PW12O40对合成其它己二酸二烷基酯的催化性能，酯化率均达到99.5%以上。此外，(NH4)0.5Ag0.5H2PW12O40经过4次使用后，酯化率仍然高达98.6%。

Abstract:

Ammonium and silver co-doped phosphotungstic acid was prepared by ion-exchange method and used as catalyst for the synthesis of dioctyl adipate. The structure, acid strength and surface acid density of (NH4)0.5Ag0.5H2PW12O40 were characterized by FT-IR, XRD and Hammett indicator method. As shown by the results, (NH4)0.5Ag0.5H2PW12O40 performed the highest activity, and the esterification rate reached 99.8%. The catalytic activity of (NH4)0.5Ag0.5H2PW12O40 was higher than that of traditional single cation doped phosphotungstic acid. The catalytic property of (NH4)0.5Ag0.5H2PW12O40 for the synthesis of other dialkyl adipate was also investigated. And the esterification rate was over 99.5%. In addition, the esterification rate still reached up to 98.6% after (NH4)0.5Ag0.5H2PW12O40 recycling in 4 runs.