Preparation and Evaluation of Unsupported Ni-Mo Catalysts forSynthesis of Tetrahydrothiophene
1. College of Chemistry & Environment Engineering, Baise University, Baise 533000, China;
2. College of Chemical Engneering & Technology, Shijiazhuang University, Shijiazhuang 050000, China;
3. College of Chemical Engneering & Technology, Hebei University of Technology, Tanjin 300130, China
Abstract Unsupported Ni-Mo composite oxide catalysts were prepared by the sol-gel method, and were characterized using N2 adsorption-desorption, X-ray diffraction(XRD), infrared spectrum(FT-IR), X ray energy spectrum(EDS) and H2 temperature programmed reduction(H2-TPR). In a continuous flow fixed-bed reactor, the effects of Mo/Ni molar ratio and reaction temperature on the hydrodeoxygenation activity were investigated using sulfolane plus ethybenzene solution(emphatically 10% of sulfolane) as a probe compound. The results showed that Ni-Mo composite oxide catalysts prepared by sol-gel method possess higher specific surface area. The composite oxide NiMoO4 was formed by Ni and Mo active components. Mo content on the catalyst surface increased and then decreased with the increase of Mo/Ni ratio.Mo content reached the highest when Mo/Ni ratio was 0.6 at which the catalyst exhibited the highest hydrodeoxygenation activity. Under the conditions of 230 ℃, 0.3 MPa, liquid hourly space velocity 1 h-1, the conversion of sulfolane and the selectivity of tetrahydrothiophene were 91.3% and 84.1%, respectively.
