화학공학소재연구정보센터
Catalysis Letters, Vol.146, No.9, 1663-1673, 2016
Dry Reforming of Methane for Syngas Production Over Well-Dispersed Mesoporous NiCe0.5Zr0.5O3 with Ni Nanoparticles Immobilized
Ni incorporated catalysts with different ratios of Ce/Zr were prepared via a one-pot surfactant assisted Pechini method, and dry reforming of methane was used to evaluate their performances. The prepared catalysts were characterized by nitrogen adsorption-desorption, XRD, SEM, TEM and TGA. The nitrogen physisorption analysis witnessed the distinctive mesoporosity of NiCe0.5Zr0.5O3. The TEM observation confirmed a homogeneous dispersion of NiO nanoparticles within the mesopores, and the XRD presented a high crystallinity of NiCe0.5Zr0.5O3 within relatively smaller particle size. After 6 h dry reforming of methane in a fixed-bed reactor, the minimal carbon deposition was detected on the used NiCe0.5Zr0.5O3 among the NiCexZr1-xO3 (x = 0.1, 0.5, 0.9) catalysts, and XRD result also indicates nano-sized NiO particle on the fresh catalyst will be of great benefit to the resistance of carbon formation. The mesoporous structure of NiCe0.5Zr0.5O3 was achieved at Ce/Zr = 1:1 and NiO particles incorporated in the pore were also clearly observed based on the characterization results. The catalytic evaluation experiments prove its remarkable initial activity (CH4 94.0 & CO2 97.2 %), minimal carbon formation, and outstanding catalytic performance at different WHSVs. A series of NiCexZr1-xO3 catalysts were prepared and the optimal synthesis ratio of Ce/Zr is 1:1 based on the characterization results. NiCe0.5Zr0.5O3 presents a few features such as mesoporous structure, highly dispersed NiO, large surface area, and small crystallized sizes. DRM reaction experiments also prove NiCe0.5Zr0.5O3 has remarkable catalytic performance.