Abstract This study aimed to develop a highly efficient Ru catalyst using mixed oxide support of lanthanides and MgO. Mixed oxide support of Er2O3 with MgO showed higher catalytic activity for ammonia synthesis among other lanthanides. Therefore, MgO–Er2O3 mixed oxide supports with different molar ratios of Mg/Er were prepared by the co-precipitation method. 1% Ru was deposited by the impregnation method using Ru(NO3)3 as a Ru precursor. The activity measurement for ammonia synthesis was carried out in a fixed-bed flow reactor. It was found that the catalytic activity of the Ru/MgO–Er2O3 catalyst with higher MgO content (Mg/Er = 25/1) was comparably high as that obtained for 1% Ru deposited on pure Er2O3 support under same reaction conditions. The plausible reason was attributed to the same textural properties of the mixed oxide MgO–Er2O3 supported Ru catalysts up to a Mg/Er ratio of 25/1, where Ru was selectively deposited on Er2O3.

中文翻译：

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用于氨合成的高效 Ru/MgO–Er2O3 催化剂

摘要 本研究旨在开发一种使用镧系元素和MgO 的混合氧化物载体的高效Ru 催化剂。Er2O3 与 MgO 的混合氧化物载体在其他镧系元素中显示出更高的氨合成催化活性。因此，通过共沉淀法制备了具有不同 Mg/Er 摩尔比的 MgO-Er2O3 混合氧化物载体。使用Ru(NO3)3 作为Ru 前体，通过浸渍法沉积了1% 的Ru。氨合成的活性测量在固定床流动反应器中进行。发现具有较高 MgO 含量（Mg/Er = 25/1）的 Ru/MgO-Er2O3 催化剂的催化活性与在相同反应条件下沉积在纯 Er2O3 载体上的 1% Ru 获得的催化活性相当。