Mixed oxides derived from the calcination of modified hydrotalcites precursors with copper and lanthanum were synthetized by the co‐precipitation method and characterized and applied as catalysts for ethanol Guerbet coupling reactions. The oxides obtained were used to convert ethanol into 1‐butanol and long‐chain alcohols, mostly 1‐hexanol. The selectivity for 1‐butanol and 1‐hexanol reached 62% and 10% for Cu‐MgAl(O) at 280°C. The addition of 1 mol% of La³⁺ (CuLa‐MgAl(O)) increased the number of basic sites comparing to Cu‐MgAl(O) changing the selectivity for 1‐butanol and 1‐hexanol reaching 16.70 and 41.7% at 280°C. The addition of lanthanum and consequently the increase on the catalyst basicity was related to the obtainment of long‐chain alcohols due to the enolate formation during the aldol condensation of Guerbet coupling.

中文翻译：

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铜和镧混合氧化物作为乙醇Guerbet偶联催化剂：La3 +在长链醇生产中的作用

通过共沉淀法合成了由改性水滑石前体与铜和镧一起煅烧而得的混合氧化物，并对其进行了表征并用作乙醇Guerbet偶联反应的催化剂。获得的氧化物用于将乙醇转化为1-丁醇和长链醇，大部分为1-己醇。在280°C下，Cu-MgAl（O）对1-丁醇和1-己醇的选择性达到62％和10％。加入1 mol％的La ³⁺与Cu-MgAl（O）相比，（CuLa-MgAl（O））增加了碱性位点的数量，从而改变了1-丁醇和1-己醇在280°C时的选择性达到16.70和41.7％。镧的添加以及因此催化剂碱性的增加与在Guerbet偶联的醇醛缩合过程中烯醇化物形成导致的长链醇的获得有关。