Selective aqueous-phase hydrogenation of furfural to cyclopentanol over PdRu/C catalyst

The bimetallic PdRu catalyst supported on carbon nanotubes were found ot provide an efficient synthesis of cyclopentanol in aqueous-phase hydrogenation of furfural. Under the chosen reaction conditions (temperature of 473 K, total pressure of 8 MPa), the selectivity towards cyclopentanol reaches 77% at a complete conversion of furfural. A high activity of this catalyst can be associated with changes in the electronic state and dispersion of the supported metals caused by their mutual interaction and formation of PdRu alloy.     

Influence of the Kind of the Components on the Structure of Aerogel-Type Polyvinyl Alcohol/Carbon Black Composite Materials and on Their Resistance to Heat and Mechanical Actions

Russian Journal of Applied Chemistry - The pore structure, thermal behavior, and elasticity of aerogel-type polyvinyl alcohol/carbon black composite materials prepared by cryogenic treatment of a...     

Palladium–Ruthenium Catalyst for Selective Hydrogenation of Furfural to Cyclopentanol

Bimetallic Pd–Ru/C catalyst was shown to be much more active in the aqueous-phase hydrogenation of furfural (473 K, 8 MPa) in comparison with both Pd/C and Ru/C catalysts. The enhanced hydrogenation activity manifested itself as an increased yield of cyclopentanol (77%) at a complete conversion of furfural. The observed synergistic effect between palladium and ruthenium in the tested reaction can be related to changes in the electronic state and particle size of supported metals upon interaction with each other and the Pd–Ru alloy formation.     

Synthesis of polychlorovinylenes as active conjugated polymers and their application for low-temperature formation of carbon structures

Russian Chemical Bulletin - A low-temperature approach to the synthesis of carbon structures by dehydrochlorination of carbon-chain chlorine-containing polymers was suggested. The formation of...     

Use of platinum carbonyl complexes in the synthesis of Pt/MgAlO x catalysts

Pt/MgAlO _x samples have been obtained by the adsorption of platinum carbonyl complexes on aluminum-magnesium oxides with Mg: Al = 2, 3, and 4. The composition of the adsorbed complexes has been determined. The catalysts synthesized from the carbonyl precursor show a higher activity in propane dehydrogenation and are less prone to deactivation than the catalysts prepared using platinum chloro complexes.     

Acidity of Solutions of Heteropoly Acids with Various Structures and Compositions

Hammett acidity functions H ₀ of solutions of heteropoly acids H₅PW₁₁XO₄₀ (X(IV) = Ti, Zr), H₃PW₁₂O₄₀, H₄SiW₁₂O₄₀, H₆P₂W₂₁O₇₁, and H₂₁B₃W₃₉O₁₃₂, as well as HClO₄ and CF₃SO₃H, in water and 90% aqueous acetone and acetonitrile, are measured at 20°C by the indicator method. In aqueous solutions all acids under study have the same strength, and in organic solvents their acidities differ. A correlation between the catalytic activity and acidity of the solution is found for the condensation of acetone to mesityl oxide.     

Effect of Pt additives on the properties of Pd/C catalysts in the liquid-phase hydrogenation ofo-nitrophenol

The addition of platinum to Pd/C catalysts results in a synergetic increase in the activity of the catalysts in the hydrogenation ofo-nitrophenol. The synergetic effect depends on the method of preparation of the bimetallic catalysts.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, p. 804, April, 1993.     

Genesis of the active-component precursor in the synthesis of Pt/Al<Subscript>2</Subscript>O<Subscript>3</Subscript> catalysts: III. Transformations of adsorbed platinum complexes during drying

The transformations of platinum(IV) complexes subsequent to their sorption on the support are considered. As the Pt(IV)/Al₂O₃ systems are dried at 25°C in daylight, their dehydration is accompanied by the replacement of inner sphere ligands of Pt(IV) by OH groups and the Coulombic bonding between the adsorbed metal complexes and the support turns into coordination bonding. Drying at a higher temperature of 120°C does not increase the extent of hydrolysis of the bound complexes in the predried samples. The observed increase in the proportion of unreadily reducible platinum species is likely due to the multisite adsorption of platinum complexes taking place.