Formation of Ru–M/Sibunit Catalysts for Ammonia Synthesis |
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| Authors: | Shitova N. B. Dobrynkin N. M. Noskov A. S. Prosvirin I. P. Bukhtiyarov V. I. Kochubei D. I. Tsyrul'nikov P. G. Shlyapin D. A. |
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| Affiliation: | (1) Omsk Branch, Siberian Division, Russian Academy of Sciences, Boreskov Institute of Catalysis, Omsk, 644053, Russia;(2) Siberian Division, Russian Academy of Sciences, Boreskov Institute of Catalysis, Novosibirsk, 630090, Russia |
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| Abstract: | The effects of the nature of ruthenium and alkaline promoter precursor compounds and support properties on the activity of Ru–(Cs, K)/Sibunit catalysts in the reaction of ammonia synthesis were studied. The formation of active centers in the catalysts was studied with the use of EXAFS, XPS, and electron micro-scopy. It was found that ruthenium and a portion of cesium occurred in metallic states in the reduced catalysts. The most active catalysts containing 4 wt % ruthenium at the atomic ratios [K] : [Ru] = 4.5 and [Cs] : [Ru] = 2.5 were obtained with the use of the [Ru(dipy)3](OH)2 complex. |
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