Sacrificial Sucrose Strategy Achieved Enhancement of Ammonia Synthesis Activity over a Ceria-Supported Ru Catalyst

CeO2-supported Ru catalysts have high hope for ammonia synthesis; however, their industrial application in ammonia synthesis is finite by the presence of the strong metal-support interaction (SMSI) or Ru encapsulation. Herein, a sacrificial sucrose strategy was adopted to prepare a CeO2-supported Ru catalyst without invoking SMSI or Ru encapsulation. Owing to the improvement of the proportion of Ru-0, Ce3+ concentration, number of the exposed ruthenium species, and Ru-O-Ce bonds, the catalyst obtained by sacrificial sucrose strategy can adsorb lots of hydrogen species, and a higher proportion of H species desorb by way of forming H-2, leading to the increase of ammonia synthesis activity is by 43% in comparison with the catalyst without sucrose sacrifice.

二氧化铈负载的钌催化剂在氨合成方面很有希望；然而，由于强金属 - 载体相互作用（SMSI）或钌包裹的存在，它们在氨合成中的工业应用受到限制。在此，采用一种牺牲蔗糖策略来制备一种没有引发SMSI或钌包裹的二氧化铈负载的钌催化剂。由于Ru - 0的比例、Ce³⁺浓度、暴露的钌物种数量以及Ru - O - Ce键的改善，通过牺牲蔗糖策略获得的催化剂能够吸附大量氢物种，并且更高比例的H物种通过形成H₂的方式脱附，导致氨合成活性与未使用蔗糖牺牲的催化剂相比提高了43%。