Chemisorption and hydrogen spillover on framework ruthenium catalysts

Dmitriev, R. V.; Зубарева, Н. Д.; Vedenyapin, A. A.; Клабуновский, Е. И.; Миначев, Х. М.

doi:10.1007/bf00961086

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(2 citation statements)

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“…A further H 2 consumption was measured above 500 °C, likely due to some H 2 spillover phenomenon occurring on the formed Ru 0 particles. 30,31 Consequently, the gel-derived material was pre-reduced at 300 °C (Ru-SiO 2 ) before the catalytic tests.…”

Section: Resultsmentioning

confidence: 99%

“…Concerning the two TPR main peaks, the former can be assigned to H 2 consumption by a highly dispersed RuO 2 phase, weakly interacting with the support, and the latter to H 2 consumption by larger and less dispersed RuO 2 particles, likely the crystalline RuO 2 phase detected by Raman spectroscopy (vide infra). A further H 2 consumption was measured above 500 °C, likely due to some H 2 spillover phenomenon occurring on the formed Ru 0 particles. , Consequently, the gel-derived material was pre-reduced at 300 °C (Ru-SiO 2 ) before the catalytic tests.…”

Section: Results and Discussionmentioning

confidence: 99%

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Self-Activating Catalyst for Glucose Hydrogenation in the Aqueous Phase under Mild Conditions

et al. 2019

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The search for efficient routes for the production of sorbitol from starch-derived glucose is of great interest and importance because sorbitol is a highly attractive chemical for different applications, such as a building block for the synthesis of fine chemicals, additives in food, and the cosmetic and paper industries. In this study, the (RuO2)0.038·(SiO2)0.962 nanomaterial was prepared by a one-pot sol–gel route. The performances of the gel-derived catalyst in the glucose hydrogenation reaction, in the aqueous phase and mild conditions, are reported and compared with those of a commercial Ru/C catalyst. When the commercial Ru/C catalyst was used, a high activity and no selectivity loss were observed, but the activity dramatically dropped soon after the first cycle; on the contrary, the gel-derived catalyst activity increased during the first three cycles. The different catalytic behavior was ascribed to the morphological distribution of the Ru active phase in the gel-derived catalyst. Actually, the adopted synthesis procedure leads to a multimodal size distribution of the Ru nanoparticles, which are fairly stabilized by a combined interaction with the SiO2 support and the reaction environment, which proved to be active in obtaining a self-activating catalyst.

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Section: Resultsmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%