Abstract
AbstractSilica‐supported molybdenum oxide (MoOx/SiO2) with 4.8 wt% Mo (0.5 mmol g−1) was an effective and reusable heterogeneous catalyst for dehydration of 2‐furamide to 2‐furonitrile (96 % yield). The catalyst was applicable to the dehydration of various amides including heteroaromatic, aromatic and alkyl amides, providing the corresponding nitriles in high yields (87‐97 %). Based on the results of catalyst characterizations (XRD, TEM, UV‐vis, Raman) and activity tests, MoOxspecies are highly dispersed over SiO2, and heptamolybdate anion ([Mo7O24]6−) and isolated dioxo ((O=)2MoO2) were mainly formed on the SiO2support of the optimal MoOx/SiO2catalyst. The strong Brønsted acid sites (Mo‐OH−Si site) can be formed from the MoOxspecies and the adjacent silanol group, and the acid‐base pair site (Mo(=O)−OH−Si site) of the strong Brønsted acid site (Mo−OH−Si site) and base site (Mo=O) over MoOx/SiO2catalyst could be the main active site for the dehydration of amides.
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