Improvement of Cobalt Dispersion on Co/SBA-15 and Co/SBA-16 Catalysts by Ultrasound and Vacuum Treatments during Post-Impregnation Step

Abstract

Abstract. The Co/SBA-15 and the Co/SBA-16 catalysts having 20 wt% of cobalt were prepared by the conventional impregnation method. Then, the post-impregnation treatments including vacuum and ultrasound treatments were applied. The synthesized catalysts were characterized by means of N2 physisorption, small angle X-ray diffraction (SAXRD), wide angle X-ray diffraction (XRD), scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM/EDX), transmission electron microscopy (TEM), and temperature-programmed reduction (TPR). The results show that the synthesized SBA-15 had hexagonal structure and the synthesized SBA-16 had the cubic structure. The vacuum and the ultrasound treatments after incipient wetness impregnation can apparently enhance the dispersion of cobalt on the SBA-15 catalysts due to the decrease of the metal crystallite size. However, only the vacuum treatment was suitable for the Co/SBA-16. After reduction, no cobalt-silicate compound was detected based on XRD measurement. Both postimpregnation treatments can also decrease the metal-support interaction resulting in increased activity for CO2 hydrogenation under methanation.

Tailoring the Properties of Metal Oxide Loaded/KCC-1 toward a Different Mechanism of CO2 Methanation by in Situ IR and ESR

“…Peaks at 620 and 650 K belong to stepwise reduction of Co 2 O 3 to CoO and of CoO to Co 0 . The peak at the higher temperature of 915 K might be due to reduction of Co interacting strongly with parent KCC-1 . Ni/KCC-1 shows a broad peak consisting of three peaks at 483, 593, and 693 K, respectively.…”

Microwave, Ultrasound, and Mechanochemistry: Unconventional Tools that Are Used to Obtain “Smart” Catalysts for CO2 Hydrogenation

“…In another recent study, Co/SBA-15 and Co/SBA-16 catalysts with 20 wt % Co loading were prepared by conventional incipient wetness impregnation method [107]. Additional vacuum and US treatments were performed after the synthesis.…”

On the effect of yttrium promotion on Ni-layered double hydroxides-derived catalysts for hydrogenation of CO2 to methane

“…Out of all proposed CO 2 hydrogenation reactions, e.g., methanol synthesis, higher hydrocarbons or methanation, the most developed one methanation (CO 2 + 4H 2 = CH 4 + 2H 2 O), with a few plants already operational in European Union [8,9]. The most widely studied catalysts for Sabatier's reaction in literatures are those based on group 8, 9, 10 metals-Fe, Ru, Rh, Co, Ni, or Pt [3,6,[10][11][12][13][14][15][16][17][18][19][20][21][22]. However, the most active and selective catalysts towards methane were found to be those based on Rh, Ru and Ni [6,9,10,19,[22][23][24].…”