Perovskites are being studied for use as catalysts due to their tunable reducibility. The inclusion of Sr in these perovskites increases the ease of oxygen vacancy formation. Ethanol and ethanal conversion on an oxygen-deficient La0.7Sr0.3MnO3-x(100) surface was investigated in this study. Previous researchers concluded in studies over CeO2-x that alcohols were converted to aldehydes on unreduced oxygen sites and to alkenes on oxygen vacancy sites, via two separate pathways. However, we have found evidence that catalytic aldehyde formation may actually require oxygen vacancies on La0.7Sr0.3MnO3-x(100), which is then followed by oxygen abstraction to form the alkene. That is, that they are produced via the same pathway. Based on this evidence, we propose a reaction mechanism that ethanal production requires vacancies, due to hydrogen abstraction from alkoxy species in vacancies, followed by ethene formation.

Catalysis of hydrogen and oxygen abstraction from ethanol and ethanal over La0.7Sr0.3MnO3-x

2019 Fall National Meeting

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