Operando XAS and NAP-XPS studies of preferential CO oxidation on Co₃O₄ and CeO₂-Co₃O₄ catalysts

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• 作者：Liliana Lukashuk^a ; ¹ ; Karin F&ouml ; ttinger^a ; ^{karin.foettinger@tuwien.ac.at} ; Elisabeth Kolar^a ; Christoph Rameshan^a ; Detre Teschner^b ; Michael Hä ; vecker^b ; Axel Knop-Gericke^b ; Nevzat Yigit^a ; Hao Li^a ; Eamon McDermott^a ; Michael St&ouml ; ger-Pollach^c ; Gü ; nther Rupprechter^a
• 关键词：Cobalt oxide ; PROX ; Hydrogen ; Operando XAS ; NAP-XPS ; Ceria promoter ; Oxidation state
• 刊名：Journal of Catalysis
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：344
• 期：Complete
• 页码：1-15
• 全文大小：4310 K
• 卷排序：344

文摘

Co3O4 bulk and surface state was characterized by operando XANES and NAP-XPS. Easy surface reduction in pure CO (∼100 °C) is via reaction with lattice oxygen. Fast reoxidation by O2 prevents overall reduction. Co3O4 bulk and surface appear fully oxidized under PROX selective conditions. CeO2 promotion increases reduction temperatures in CO and H2 and enhances PROX activity.