Hydrogen production from dry reforming of methane (DRM)
not only
concerns with green energy but also involves the consumption of two
greenhouse gases CH4and CO2. The lattice oxygen
endowing capacity, thermostability, and efficient anchoring of Ni
has brought the attention of the DRM community over the yttria-zirconia-supported
Ni system (Ni/Y + Zr). Herein, Gd-promoted Ni/Y + Zr is characterized
and investigated for hydrogen production through DRM. The H2-TPR → CO2-TPD → H2-TPR cyclic
experiment indicates that most of the catalytic active site (Ni) remains
present during the DRM reaction over all catalyst systems. Upon Y
addition, the tetragonal zirconia-yttrium oxide phase stabilizes the
support. Gadolinium promotional addition up to 4 wt % modifies the
surface by formation of the cubic zirconium gadolinium oxide phase,
limits the size of NiO, and makes reducible NiO moderately interacted
species available over the catalyst surface and resists coke deposition.
The 5Ni4Gd/Y + Zr catalyst shows about ∼80% yield of hydrogen
constantly up to 24 h at 800 °C.