Abstract

Alumina modified by LaFeO₃ was used as the support of gold (Au) catalysts for low temperature CO oxidation. In dry reactant feed, the catalyst showed catalytic stability similar to that found for the Al₂O₃ supported Au catalyst. However, the modification of FeLaO₃ perovskite significantly improved the catalytic stability of the Au catalyst in the co-presence of gaseous reactants and water vapor. The modification gives the catalyst a double advantage: it enables the presence of moisture that improves the catalytic activity and promotes the formation of larger pores in the modified catalyst that facilitate a timely removal of water vapor from the catalyst. Furthermore, it also prevents the aggregation of gold nanoparticles as well as the deactivation caused by excessive water vapor.

中文翻译：

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Au / FeLaO3 / Al2O3催化剂在低温CO氧化中的催化稳定性

摘要

由LaFeO ₃改性的氧化铝用作金（Au）催化剂的载体，用于低温CO氧化。在干反应物进料中，该催化剂显示出与Al ₂ O ₃负载的Au催化剂相似的催化稳定性。但是，FeLaO ₃的改性钙钛矿显着提高了气态反应物和水蒸气共存时金催化剂的催化稳定性。改性使催化剂具有双重优势：它使水分得以存在，从而改善了催化活性并促进了改性催化剂中较大孔的形成，从而有利于及时从催化剂中除去水蒸气。此外，它还防止了金纳米颗粒的聚集以及由于过量水蒸气引起的失活。