Delaminated hydrotalcite precursors for green methanol synthesis
Delaminated hydrotalcite precursors for green methanol synthesis
复制标题
用于绿色甲醇合成的分层水滑石前体
DOI：
10.1016/j.catcom.2023.106694
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发表时间：
2023
影响因子：
3.7
通讯作者：
Hayward J
中科院分区：
文献类型：
--
作者：
Hayward J
采用共沉淀法制备铜、锌和铝类水滑石前体，制备甲醇合成催化剂。用与水混溶的有机溶剂处理湿前体导致前体相的片状结构分层，与未处理材料的22 m2 g-1相比，表面积显著增加至340 m2 g-1。我们发现，铜最初被隔离在水滑石相，并在煅烧过程中的CuO相演变出的层状结构。还原进行到Cu 0，并且材料的煅烧和还原都不会导致层状形态的损失。这导致最终催化剂中的高Cu 0表面积（66 m2 g-1）和甲醇合成反应中的高活性。
Co-precipitation was used to prepare a copper, zinc, and aluminium hydrotalcite-like precursor to make a methanol synthesis catalyst. Treatment of the wet precursor with an aqueous miscible organic solvent led to the delamination of the sheet-like structure of the precursor phase, dramatically increasing the surface area to 340 m2g−1in comparison to 22 m2g−1for the untreated material. We show that the copper is initially sequestered within the hydrotalcite phase, and during calcination a CuO phase evolves out from the lamellar structures. Reduction proceeds to Cu0, and neither the calcination nor reduction of the material cause the loss of the lamellar morphology. This leads to high Cu0surface areas in the final catalyst (66 m2g−1) and high activity in the methanol synthesis reaction.