Hydrogenation of acetone on technetium catalysts

Abstract

The catalytic properties of supported mono-and bimetallic catalysts of the To/support, M/support, and M--Tc/support types (M = Pt, Pd, Rh, Ru, Ni, Re, Co; supports are ),-A1203, MgO, SIO2) were investigated in the acetone hydrogenation. The main products of this reaction are isopropyl alcohol and propane. The catalytic activity in the acetone hydrogenation of the metals studied decreases in the consequence Pt > Tc ---Rh > Pd> Ru > Ni ~ Re > Co (with y-AI203 as the support). The influence of support nature on the catalytic activity was investigated for the R.h--Tc system as an example. A nonadditive increase in the catalytic activity of Rh--Tc/7-A1203 in comparisen with monometaUic catalysts was found. The state of the surface of the catalysts was characterized by the UV-VIS diffuse reflectance spectra.

Role of water in metal catalyst performance for ketone hydrogenation: a joint experimental and theoretical study on levulinic acid conversion into gamma-valerolactone

“…Under these conditions, it is striking that Ru is usually more active in the conversion of LA to GVL than Pd and Pt in water, [9][10][11][12] while Ru is known to be poorly active compared to Pd and Pt in the hydrogenation of ketones under gas phase conditions. 13 Actually, the hydrogenation capability of Ru is strongly modulated by the reaction environment. Rooney et al have shown that the hydrogenation of 2-butanone catalyzed by Ru/SiO 2 is 30 times faster in water than in heptane.…”

“…This is in good agreement with experimental observations for gas phase acetone hydrogenation. 13 For the common subset of metals, the experiment gives the activity order Pt 4 Rh 4 Pd B Ru 4 Ni B Co while calculations show Pt 4 Rh 4 Ni 4 Pd B Ru 4 Co so that only Ni is slightly misplaced. Last, one can notice that the activity for the alkyl paths is mainly controlled by the acetone adsorption (IS*) as the TOF-determining state and the TS for the second hydrogenation on the carbon (TS OH-CH ) as the TOF-determining-TS while the alkoxy paths are controlled by the oxygen hydrogenation TS (TS CH-OH ) and the chemisorbed acetone (IS*) or the alkoxy state (IntO) for more oxophilic metals such as Co, Ni, and Ru.…”

Heterogeneous Ru Catalysts as the Emerging Potential Superior Catalysts in the Selective Hydrogenation of Bio-derived Levulinic Acid to γ-valerolactone: Effect of Particles Size, Solvent, and Support on activity, Stability, and Selectivity

“…Of these reports, it has been previously shown that Ru catalysts are more active than other noble and non-noble metals in the aqueous phase hydrogenation of LA [30,41]. However, in the gas phase hydrogenation of ketones, Ru catalysts were observed to be less active than other noble metals [42].…”

Robust Ruthenium Catalysts Supported on Mesoporous Cyclodextrin-Templated TiO2-SiO2 Mixed Oxides for the Hydrogenation of Levulinic Acid to γ-Valerolactone

“…The catalytic reduction of LA with hydrogen was first reported in 1930 by Schuette and Thomas [ 5 ], who showed that an 87% yield in GVL could be achieved in organic solvent with a PtO 2 catalyst after 44 h at room temperature and 3 bar H 2 . Since then, many metal catalysts have been reported in the literature and among them, Ru has proven to be the most suitable for the hydrogenation of LA to GVL in aqueous phase [ 6 , 7 , 8 , 9 , 10 , 11 ], whereas Pd and Pt were found to be more active in the hydrogenation of ketones under gas phase conditions [ 12 ]. Michel et al [ 13 ] correlated the better activity of Ru in aqueous phase to its higher degree of oxyphilicity with respect to Pd and Pt.…”