Lanthanide oxide modified nickel supported on mesoporous silica catalysts for dry reforming of methane

• Published in: International journal of hydrogen energy Vol. 46; no. 62; pp. 31608 - 31622
• Main Authors: Li, Bin, Yuan, Xiaoqing, Li, Lvyin, Li, Baitao, Wang, Xiujun, Tomishige, Keiichi
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 08.09.2021
• Subjects: Carbon deposition; Dry reforming of methane; Kinetic study; Lanthanide oxides; Nickel catalysts; Kinetic study; Nickel catalysts; Carbon deposition; Lanthanide oxides; Dry reforming of methane
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2021.07.056

Addition of rare earth oxide, especially lanthanide oxide, was regarded as a promising strategy to improve the carbon resistance for Nickel-based catalysts in dry reforming of methane (DRM). In this work, Nickel-based catalysts containing lanthanide oxides (NiLa/SiO2, NiCe/SiO2, NiSm/SiO2, and NiGd/SiO2) were prepared and employed to catalyze DRM. Lanthanide oxide affected the formation of Ni nanoparticles in different size. In NiLa/SiO2 and NiCe/SiO2, Ni nanoparticles maintained relatively small size (4 nm), while in NiSm/SiO2 and NiGd/SiO2, nickel particles were in large size (8 nm). NiLa/SiO2 and NiCe/SiO2 exhibited better stability than the other two catalysts, with CH4 conversion decreasing from 64.6 to 57.6% and 61.6 to 60.3%, respectively in 10 h on stream. The kinetic study confirmed that adding lanthanide oxide significantly affected the activation energy of CH4 dissociation and CO2 dissociation. Compared to monometallic Ni/SiO2, the presence of Sm and Gd suppressed CO2 dissociation, and introduction of Ce and La effectively promoted CO2 dissociation. These characters contributed to the higher carbon resistance and good stability for NiLa/SiO2 and NiCe/SiO2 catalysts in DRM reaction. [Display omitted] •Nickel-based silica catalysts containing lanthanide oxides were synthesized.•Addition of CeO2 and La2O3 showed high carbon resistance for CH4 dry reforming.•Introduction of CeO2 and La2O3 to nickel catalyst promoted the CO2 dissociation.•Nickel catalyst modified with Sm2O3 and CeO2 facilitated the CH4 dissociation.