Selective Alkane Oxidation by Manganese Oxide: Site Isolation of MnOx Chains at the Surface of MnWO4 Nanorods. Issue 12 (23rd February 2016)

• Record Type: Journal Article
• Authors: Li, Xuan; Lunkenbein, Thomas; Pfeifer, Verena; Jastak, Mateusz; Nielsen, Pia Kjaer; Girgsdies, Frank; Knop‐Gericke, Axel; Rosowski, Frank; Schlögl, Robert; Trunschke, Annette
• Is Part Of: Angewandte Chemie international edition. Volume 55:Issue 12(2016)
• Page Start: 4092
• Page End: 4096
• Publication Date: 2016-02-23
• Subjects: heterogeneous catalysis -- hydrothermal synthesis -- in situ Raman spectroscopy -- manganese tungstate -- oxidative dehydrogenation; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201510201
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: The electronic and structural properties of vanadium‐containing phases govern the formation of isolated active sites at the surface of these catalysts for selective alkane oxidation. This concept is not restricted to vanadium oxide. The deliberate use of hydrothermal techniques can turn the typical combustion catalyst manganese oxide into a selective catalyst for oxidative propane dehydrogenation. Nanostructured, crystalline MnWO4 serves as the support that stabilizes a defect‐rich MnO x surface phase. Oxygen defects can be reversibly replenished and depleted at the reaction temperature. Terminating MnO x zigzag chains on the (010) crystal planes are suspected to bear structurally site‐isolated oxygen defects that account for the unexpectedly good performance of the catalyst in propane activation. Abstract : Site isolation of surface manganese oxide species was obtained by the hydrothermal synthesis of nanostructured MnWO4 . In contrast to manganese oxide, which is a combustion catalyst, MnO x chains on the exposed (010) crystal plane of MnWO4 selectively catalyze the oxidative dehydrogenation of propane to propene.