Three different bimetallic Ru:Ni catalysts supported on a mesoporous silica MCM-48 were prepared by consecutive wet impregnations, with a total metal loading of ca. 3 % (w·w-1). Ru:Ni ratios spanned in the range of 0.15 – 1.39 (w·w-1) and were compared with the corresponding monometallic Ni/MCM-48. The catalysts so prepared were characterized by X-Ray Diffraction, Transmission Electron Microscopy, adsorption / desorption of N2, Temperature Programmed Reduction, NH3 – TPD and Atomic Absorption, and tested in the liquid phase hydrogenation of D-Glucose into sorbitol in the temperature range 120 – 140 ºC under 2.5 MPa of H2 pressure. Bimetallic catalysts with Ru:Ni ratios higher than 0.45 enhanced the catalytic behavior of the monometallic Ni/MCM-48 in the reaction, increasing the reaction rate and showing complete selectivity to sorbitol by minimizing the production of mannitol. Ru:Ni/MCM-48 (0.45) was recovered from the reaction media and tested for three reaction cycles, showing good stability under the selected experimental conditions.
Publication is available at: http://dx.doi.org/10.1016/j.apcata.2016.10.018
Alberto Romeroa, Antonio Nieto-Márquezb, Esther Alonsoa
a High Pressure Processes Group. – Chemical Engineering and Environmental Technology Department – Dr. Mergelina s/n, 47011 Valladolid, Spain.
b Mechanical, Chemical and Industrial Design Engineering Department. –ETSIDI- Technical University of Madrid (UPM). Ronda de Valencia 3, 28012 Madrid, Spain