| 초록 |
Bimetallic NiV supported on SiO2 catalysts were tested in the steam reforming of ethanol. The catalysts were prepared by the wet impregnation method and all the catalysts had a Ni oxide or NiV oxide loading of 30 wt.-% verse SiO2 weight. The catalysts are characterized by energy dispersive X-ray spectroscopy, nitrogen adsorption/desorption isotherm, X-ray diffraction, temperature programmed desorption with CO and H2O, and temperature programmed reduction with H2. From the analyses of XRD and XPS, it was also possible to estimate the oxidation states and the crystallite sizes of the NiO or metallic Ni in NiV/SiO2 catalysts, which suggested the depressed agglomeration between Ni particles by V promoters. The ESR catalytic tests for hydrogen production were performed in a fixed bed reactor containing 0.4 g catalyst at 650 oC and 6,000 h-1 GHSV after H2-pre treatment, with an inlet H2O:CH3CH2OH ratio of 3:1. These tests showed that the hydrogen evolution on the Ni8V2/SiO2 catalyst during ESR was significantly improved by the suppressing deposition of carbon, compared to those on the Ni/SiO2 catalyst. |
