Characterization of Ag-promoted Ni/SiO2 Catalysts for Syngas Production via Carbon Dioxide (CO2) Dry Reforming of Glycerol

Abstract

The carbon dioxide (CO2) dry reforming of glycerol for syngas production is one of the promising ways to benefit the oversupply crisis of glycerol worldwide. It is an attractive process as it converts carbon dioxide, a greenhouse gas into a synthesis gas and simultaneously removed from the carbon biosphere cycle. In this study, the glycerol dry reforming was carried out using Silver (Ag) promoted Nickel (Ni) based catalysts supported on silicon oxide (SiO2), i.e. Ag-Ni/SiO2. The catalysts were prepared through wet impregnation method and characterized by using Brunauer-Emmett-Teller (BET) surface area, Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD), and Thermo Gravimetric (TGA) analysis. The experiment was conducted in a tubular reactor which condition fixed at 973 K and CO2 to glycerol molar ratio of 1, under atmospheric pressure. It was found that the main gaseous products are H₂, CO and CH4 with H₂:CO molar ratio < 1.0. From the reaction study, Ag(5)-Ni/SiO2 results in highest glycerol conversion and hydrogen yield, accounted for 32.6% and 27.4%, respectively.

Dry reforming of glycerol over Rh-based ceria and zirconia catalysts: New insights on catalyst activity and stability

“…In the light of these points, Rh/ ZrO 2 and Rh/CeO 2 can be envisioned as promising novel catalysts that can be investigated in GDR process. Along these lines, in the current study, we report Rh-based GDR catalysts which outperform the existing Ni-based ones [17][18][19][20][21][22][23][24] in terms of activity and stability. Furthermore, through in-situ/ex-situ spectroscopic/imaging experiments, for the first time in the literature, we provide valuable insights regarding the origins of catalytic activity, stability, aging and sintering in GDR reaction.…”

“…Since product analysis was done on the basis of gaseous species, it was not possible to calculate glycerol conversion from the molar flow rate of glycerol in the product stream. In this case, as commonly done in the literature [17][18][19][20][21][22][23][24] an atomic balance over hydrogen was conducted to calculate the amount of converted glycerol. Molar flow rates of all gaseous products that contain H atoms were used in the calculation, as shown in Eq.…”

“…Superiority of CaO supported samples over ZrO 2 supported ones was attributed to the higher metal dispersion and smaller NiO crystallite size over CaO as revealed by XRD analysis. Harun et al [24] studied 0-5% Ag-promoted 15% Ni/SiO 2 catalysts for GDR. It was revealed by XRD analysis that addition of Ag did not change the metal crystallite size significantly, but improved H 2 yield and glycerol conversion.…”

Dry Reforming of Ethanol and Glycerol: Mini-Review

“…The best glycerol conversion (40.7%) and high yield of H 2 (32%) were observed for Ag-Ni/Al 2 O 3 . This result can ascribed to the smaller crystallite size of Ag in Ag-Ni/Al 2 O 3 , which was beneficial for metal dispersion [57].…”

Preface of BCREC Volume 11 Issue 2 Year 2016

“…The catalysts were palladium promoter on Ni-based catalysts [10], carbon dioxide dry reforming of glycerol for hydrogen production using Ni/ZrO2 and Ni/CaO catalysts [11], Co/CeO2 catalyst [12], Ag-promoted Ni/SiO2 catalyst [13], and Ni/Al2O3 catalyst [14].…”