Calcined hydrotalcites doped with Ni²⁺ (HTC-Ni-T) were prepared and used as catalysts for the synthesis of polycarbonate diols (PCDLs) via transesterification between dimethyl carbonate (DMC) and 1,4-butanediol (BDO). The effects of the content of doped Ni²⁺ and calcination temperature of HTC-Ni-T on the BDO conversion were investigated. The results showed that the catalytic activity is positively correlated with the content of doped Ni²⁺ (0.1–0.7 mmol g⁻¹ HT) and calcination temperature (573–773 K), and is determined by the basicity and the structure of the catalyst. HTC-Ni with a Ni²⁺ doping content of 0.7 mmol g⁻¹ HT calcined at 773 K exhibited the maximum activity. Based on this, the effects of reaction conditions on the conversion of BDO and the yield of PCDLs were studied. Under optimal reaction conditions, the conversion of BDO can reach 80.9% for the transesterification and the yield of PCDLs with an M_w of 1880 can reach 95% for the polycondensation. Moreover, the catalyst was reused four times without a significant loss of the catalytic activity.

中文翻译：

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过渡金属Ni ²⁺掺杂的煅烧水滑石催化合成聚碳酸酯二醇

制备了掺杂有Ni ^2+的煅烧水滑石（HTC-Ni- T），并用作通过碳酸二甲酯（DMC）和1,4-丁二醇（BDO）之间的酯交换反应合成聚碳酸酯二醇（PCDL）的催化剂。研究了掺杂Ni ²⁺的含量和HTC-Ni- T的煅烧温度对BDO转化率的影响。结果表明，催化活性与掺杂Ni ²⁺（0.1–0.7 mmol g ^-1 HT）的含量和煅烧温度（573–773 K）呈正相关，并且取决于催化剂的碱性和结构。 。Ni ²⁺掺杂含量为0.7 mmol g ^-1的HTC-Ni在773 K下煅烧的HT表现出最大的活性。在此基础上，研究了反应条件对BDO转化率和PCDLs收率的影响。在最佳反应条件下，BDO的转化可以达到用于酯交换和PCDLs的与产率80.9％中号_瓦特的1880可以用于缩聚达到95％。而且，催化剂被重复使用了四次而没有明显的催化活性损失。