Ceria-Doped Ni/SBA-16 Catalysts for Dry Reforming of Methane

Abstract

Ni-ceria nanoparticles (Ni/Ce = 1/1) in the cage-like pores of SBA-16 were prepared and evaluated in methane dry reforming reactions. Coexistence of ceria in NiCe/SBA-16 resulted in forming uniformly sized Ni particles (av. 5.7 nm) within the mesopores of SBA-16, because of the confinement effect from the framework of SBA-16 and the strong interaction between Ni and ceria. Ceria addition facilitated the reduction of NiCe/SBA-16 compared with Ni/SBA-16, and Ce3+ was the dominant species in both fresh and used NiCe/SBA-16 catalysts, as determined by Ce LIII-edge X-ray absorption near-edge structure (XANES). The methane conversion was much more stable on NiCe/SBA-16 than on Ni/CeO2 and Ni/SBA-16 in the methane dry reforming at 973 K during a 100 h reaction period; the deactivation of the Ni catalyst and the collapse of the SBA-16 framework were preferably suppressed for NiCe/SBA-16 under the reaction conditions. The remarkable effect of ceria on the structural stability of both the active Ni particles and the SBA-16 framework led to the consistent catalytic performance of NiCe/SBA-16 in methane dry reforming.

Effect of pore geometry of mesoporous supports on catalytic performances in methane reforming

“…Such destruction can take place under the preparation procedure used in this study, but the TEM images (Fig. 4(a)) prove that SBA-16 framework and pore structures remained intact, similar to the study done on DRM in [12].…”

“…From the three types of carbon discussed earlier, Cα is a reactive intermediate that does not have influence on catalyst stability; Cβ represents nanotubes and Cγ, a graphitic carbon, which is the most detrimental type responsible of catalyst deactivation [20,28,29]. Fig.…”

“…The addition of ceria to Ni/SBA-16 catalysts was studied by Zhang et al [12] and the results showed that NiCe/SBA-16 was more stable, exhibiting higher conversion than Ni/SBA-16 in DRM. The studies in the literature were conducted under different experimental conditions (varying catalyst preparation and catalytic test conditions) and a direct comparison between SBA-15 and SBA-16 is not reported.…”

Effect of the order of Ni and Ce addition in SBA-15 on the activity in dry reforming of methane

“…A suggested solution to inhibit carbon deposition is to promote the catalyst with a metal oxide, especially CeO 2 . The latter is characterized by redox properties (Ce 4+ ↔ Ce 3+ ) that promote oxygen vacancies formation, thus enhancing the mobility of surface oxygen whose presence contributes in lowering carbon deposition on the metallic particles [4][5][6][7]. It was also reported that both metal dispersion and metal-support interaction are improved in presence of CeO 2 [5,7].…”

Nickel-Doped Ceria Nanoparticles: The Effect of Annealing on Room Temperature Ferromagnetism

“…Cerium(IV) oxide (ceria) and metal-doped ceria nanoparticles have been developed for their role in catalysis [30][31][32][33][34][35][36]. One of the features that makes ceria attractive for catalysis is its ability to release/uptake oxygen from its lattice without losing its structural integrity [37].…”