TY - JOUR
T1 - The role of ceria in promoting Ni catalysts supported on phosphate‐modified zirconia for the partial oxidation of methane
AU - Abahussain, Abdulaziz A. M.
AU - Al‐Fatesh, Ahmed S.
AU - Vadodariya, Dharmesh M.
AU - Abu‐Dahrieh, Jehad K.
AU - Banabdwin, Khaled M.
AU - Alarifi, Naif
AU - Ibrahim, Ahmed A.
AU - Fakeeha, Anis H.
AU - Abasaeed, Ahmed E.
AU - Kumar, Rawesh
PY - 2024/8
Y1 - 2024/8
N2 - The catalytic partial oxidation of methane (POM) is aimed at the mitigation of CH4 (a highly potent greenhouse gas) from the environment and the synthesis of syngas with a high H2/CO ratio. Herein, to enhance the POM reaction, Ni-supported phosphate-modified-zirconia were synthesized with promotor “Ce” to achieve high H2/CO ratio (2.4–3.2). The catalysts were characterized by surface area and porosity, X-ray diffraction, RAMAN, temperature-programmed experiments (TPR, CO2-TPD, and TPO), and TEM. Increasing the ceria addition over 10Ni/PO4 + ZrO2 resulted in lower crystallinity, higher dispersion of active sites, and enhanced the surface area of catalyst. The unique and prominent reducibility and basicity of NiO-species and surface oxide ions, respectively, are particularly notable at 4 wt.% ceria loading. At a reaction temperature of 600°C, the highest concentration of active sites and a unique concentration of moderate strength basic sites can be achieved with 4 wt.% ceria loading over 10Ni/PO4 + ZrO2. This leads to 44% conversion of CH4, 36% yield of H2, 35% yield of CO2, and H2/CO ratio of 3.16 for the POM reaction. The cyclic H2TPR-O2TPO-H2TPR experiment confirms the reorganization of the active site towards high temperature under oxidizing gas O2 and reducing gas H2 gas stream during the POM reaction.
AB - The catalytic partial oxidation of methane (POM) is aimed at the mitigation of CH4 (a highly potent greenhouse gas) from the environment and the synthesis of syngas with a high H2/CO ratio. Herein, to enhance the POM reaction, Ni-supported phosphate-modified-zirconia were synthesized with promotor “Ce” to achieve high H2/CO ratio (2.4–3.2). The catalysts were characterized by surface area and porosity, X-ray diffraction, RAMAN, temperature-programmed experiments (TPR, CO2-TPD, and TPO), and TEM. Increasing the ceria addition over 10Ni/PO4 + ZrO2 resulted in lower crystallinity, higher dispersion of active sites, and enhanced the surface area of catalyst. The unique and prominent reducibility and basicity of NiO-species and surface oxide ions, respectively, are particularly notable at 4 wt.% ceria loading. At a reaction temperature of 600°C, the highest concentration of active sites and a unique concentration of moderate strength basic sites can be achieved with 4 wt.% ceria loading over 10Ni/PO4 + ZrO2. This leads to 44% conversion of CH4, 36% yield of H2, 35% yield of CO2, and H2/CO ratio of 3.16 for the POM reaction. The cyclic H2TPR-O2TPO-H2TPR experiment confirms the reorganization of the active site towards high temperature under oxidizing gas O2 and reducing gas H2 gas stream during the POM reaction.
KW - phosphate‐modified‐zirconia
KW - cyclic H2TPR‐O2TPO‐H2TPR
KW - partial oxidation of methane
KW - ceria promoter
KW - Ni catalyst
U2 - 10.1002/ese3.1820
DO - 10.1002/ese3.1820
M3 - Article
SN - 2050-0505
VL - 12
SP - 3379
EP - 3389
JO - Energy Science & Engineering
JF - Energy Science & Engineering
IS - 8
ER -