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Enhancing the stability of the Rh/ZnO catalyst by the growth of ZIF-8 for the hydroformylation of higher olefins

机译:通过ZIF-8的生长提高RH / ZnO催化剂的稳定性,用于高级烯烃的加氢甲酰化

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Hydroformylation of olefins is one of the most important industrial processes for aldehyde production. Therein, the leaching of active metals for heterogeneous catalysts is an important issue in the hydroformylation reaction, particularly for higher olefins to produce higher alcohols. Here, different Rh/ZnO catalysts with diverse ZnO as a support were investigated and a home-made ZnO _(50) support was selected to prepare the Rh/ZnO _(50) @ZIF-8 core–shell structure catalyst, which was synthesized by the growth of ZIF-8 with ZnO _(50) as the sacrificed template to afford Zn source. Compared with the Rh/ZnO _(50) catalyst, the Rh/ZnO _(50) @ZIF-8 catalyst demonstrated a better cyclic stability in the hydroformylation of 1-dodecene. Combining the experiment and characterization results, it was concluded that the ZIF-8 shell on the Rh/ZnO _(50) catalyst effectively prevented the leaching of metal Rh into the reaction solution. Moreover, the Rh/ZnO _(50) @ZIF-8 catalyst exhibited good universality for other higher olefins. This work provides a useful guideline for immobilizing the active species in heterogeneous catalysts for the hydroformylation reaction.
机译:烯烃的加氢甲酰化是醛生产最重要的工业过程之一。其中,用于非均相催化剂的活性金属的浸出是加氢甲酰化反应中的重要问题,特别是对于更高烯烃生产更高醇的重要问题。在此,研究了具有不同ZnO作为载体的不同Rh / ZnO催化剂,并选择了自制的ZnO _(50)载体以制备Rh / ZnO _(50)〜ZIF-8核 - 壳结构催化剂,即用ZnO _(50)的ZIF-8的生长合成为处死的模板,得到Zn源。与RH / ZnO _(50)催化剂相比,RH / ZnO _(50)+ ZIF-8催化剂在1-十二烯的加氢甲酰化中表现出更好的循环稳定性。结合实验和表征结果,得出结论是rh / ZnO _(50)催化剂上的ZIF-8壳有效地防止了金属Rh的浸出到反应溶液中。此外,RH / ZnO _(50)@ ZIF-8催化剂对于其他高级烯烃呈现出良好的普遍性。该工作提供了一种有用的指南,用于将活性物种固定在非均相催化剂中用于加氢甲酰化反应。

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