Catalytic Steam Reforming of Glycerol Over Cerium and Palladium-Based Catalysts for Hydrogen Production

Abstract

In this work, catalytic steam reforming of glycerol for hydrogen production was performed over Ce/Al2O3 and Pd/Al2O3 catalysts prepared via the impregnation method. The catalysts were characterized by scanning electron microscopy (SEM-EDX), transmission electron microscopy (TEM), BET surface area, and X-ray diffraction (XRD). Two sets of catalytic reactions were conducted, one comparing 1% Pd/Al2O3 to 1% Ce/Al2O3 and the second comparing 1% Ce/Al2O3 loading to 10% Ce/Al2O3 loading. All catalytic reactions were performed using a fixed-bed reactor operated at 600 °C and atmospheric pressure. Aglycerol–water mixture at a molar ratio of 1:6 was fed to the reactor at 0.05 ml/min. In the first set of experiments, Pd/Al2O3 exhibited higher hydrogen productivity than Ce/Al2O3. A maximum hydrogen yield of 56% and a maximum selectivity of 78.7% were achieved over the Pd/Al2O3 catalyst. For the second set of experiments, the results show that the reaction conversion increased as the cerium loading increased from 1% to 10%. A total average hydrogen yield of 28.0% and a selectivity of 45.5% were obtained over 1% Ce/Al2O3, while the total average hydrogen yield and selectivity were 42.2% and 52.7%, respectively, for 10% Ce/Al2O3.

Promoting effect of Sn on supported Ni catalyst during steam reforming of glycerol

“…Catalysts containing group 8-10 metals such as Ni [7][8][9][10][11][12], Co [13][14][15][16], Pt [17][18][19][20][21], Ru [22][23][24], Rh [25], Pd [26] or Ir [27] on different oxides have been largely investigated as active catalysts for glycerol steam reforming. Ni-supported is one of the most promising active metals for such an application because of its high activity, low cost and wide availability.…”

Challenges and strategies for optimization of glycerol steam reforming process

“…Ebshish et al [133] compared the catalytic performance of 1 wt.% Ce/Al2O3 and 1 wt.% Pd/Al2O3 catalysts, as well as the performance of 1 wt.% Ce/Al2O3 and 10 wt.% Ce/Al2O3. The authors observed that the 1 wt.% palladium catalyst supported on alumina presented better glycerol conversion to gaseous products as well as better H2 yield than both 1 wt.% Ce/Al2O3 and 10 wt.% Ce/Al2O3 catalysts.…”

Hydrogen Production Via Ethanol Steam Reforming Over Ni/Al2O3 Catalysts: Effect of Ni Loading

“…Moreover, because previous data were obtained with different catalyst systems and under different operating conditions, comparing catalysts prepared by different synthetic methods is difficult and inexact. The present work compares a group of NÍ/AI2O3 catalysts with various Ni loadings (6,8,10,12, and 20 wt. %) prepared by precipitation and impregnation procedures under the same set of catalyst and reaction conditions.…”

“…Several common routes are available for hydrogen production, including electrolysis and photolysis of water [1], extraction from biomass [2,3], steam reforming of hydrocarbons [4][5][6][7][8][9][10], and solar energy [11]. The hydrogen source ernployed depends largely on the geographical location of its demand.…”