Hydrogen Production from Gadolinium-Promoted Yttrium-Zirconium-Supported Ni Catalysts through Dry Methane Reforming

Hydrogen production from dry reforming of methane (DRM)not onlyconcerns with green energy but also involves the consumption of twogreenhouse gases CH4 and CO2. The lattice oxygenendowing capacity, thermostability, and efficient anchoring of Nihas brought the attention of the DRM community over the yttria-zirconia-supportedNi system (Ni/Y + Zr). Herein, Gd-promoted Ni/Y + Zr is characterizedand investigated for hydrogen production through DRM. The H-2-TPR -> CO2-TPD -> H-2-TPR cyclicexperiment indicates that most of the catalytic active site (Ni) remainspresent during the DRM reaction over all catalyst systems. Upon Yaddition, the tetragonal zirconia-yttrium oxide phase stabilizes thesupport. Gadolinium promotional addition up to 4 wt % modifies thesurface by formation of the cubic zirconium gadolinium oxide phase,limits the size of NiO, and makes reducible NiO moderately interactedspecies available over the catalyst surface and resists coke deposition.The 5Ni4Gd/Y + Zr catalyst shows about similar to 80% yield of hydrogenconstantly up to 24 h at 800 degrees C.